1. General

ACE Limited (ACE or the Company) is a holding company incorporated in Zurich, Switzerland. The Company, through its various subsidiaries, provides a broad range of insurance and reinsurance products to insureds worldwide. ACE operates through the following business segments: Insurance – North American, Insurance – Overseas General, Global Reinsurance, and Life. Refer to Note 9.

The interim unaudited consolidated financial statements, which include the accounts of the Company and its subsidiaries, have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP) and, in the opinion of management, reflect all adjustments (consisting of normally recurring accruals) necessary for a fair statement of the results and financial position for such periods. All significant intercompany accounts and transactions have been eliminated. The results of operations and cash flows for any interim period are not necessarily indicative of the results for the full year. These financial statements should be read in conjunction with the consolidated financial statements, and related notes thereto, included in the Company's Annual Report on Form 10-K for the year ended December 31, 2009.

2. Significant accounting policies

New accounting pronouncements

Adopted in the six months ended June 30, 2010

Consolidation of variable interest entities and accounting for transfers of financial assets

In June 2009, the Financial Accounting Standards Board (FASB) issued Accounting Standard Update (ASU) No. 2009-16, Accounting for Transfers of Financial Assets (ASU 2009-16) and ASU No. 2009-17, Improvements to Financial Reporting by Enterprises Involved With Variable Interest Entities (ASU 2009-17). ASU 2009-16 amends Accounting Standards Codification (ASC) Topic 860, Transfers and Servicing, by removing the exemption from consolidation for qualifying special purpose entities. This statement also limits the circumstances in which a financial asset, or portion of a financial asset, should be derecognized when the transferor has not transferred the entire original financial asset to an entity that is not consolidated with the transferor in the financial statements being presented and/or when the transferor has continuing involvement with the transferred financial asset. ASU 2009-17 amends ASC Topic 810, Consolidation, to eliminate the quantitative approach previously required for determining the primary beneficiary of a variable interest entity and requires ongoing qualitative reassessments of whether an enterprise is the primary beneficiary of a variable interest entity.   ASU 2009-16 and ASU 2009-17 were effective for interim and annual reporting periods beginning on January 1, 2010. The adoption of these provisions did not have a material impact on ACE's financial condition or results of operations.

Fair value measurements and disclosures

In January 2010, the FASB issued ASU No. 2010-06, Improving Disclosures about Fair Value Measurements (ASU 2010-06). The provisions of ASU 2010-06 amend ASC Topic 820, Fair value measurements and Disclosures, (Topic 820) to require reporting entities to make new disclosures about recurring and nonrecurring fair value measurements including the amounts of and reasons for significant transfers into and out of Level 1 and Level 2 fair value measurements and separate disclosure of purchases, sales, issuances, and settlements in the reconciliation of Level 3 fair value measurements. ASU 2010-6 was effective for interim and annual reporting periods beginning after December 15, 2009, except for Level 3 reconciliation disclosures which are effective for interim and annual periods beginning after December 15, 2010.

To be adopted after June 30, 2010

Embedded Credit Derivatives

In March 2010, the FASB issued ASU No. 2010-11, Scope Exception Related to Embedded Credit Derivatives (ASU 2010-11). The provisions of ASU 2010-11 amend ASC Topic 815, Derivatives and Hedging, to provide clarification on the bifurcation scope exception for embedded credit derivative features. ASU 2010-11 is effective for interim and annual reporting periods beginning on July 1, 2010. ACE does not expect the adoption of these provisions to have a material impact on ACE's financial condition or results of operations.

3. Investments

a) Fixed maturities

The following tables present the fair values and amortized costs of and the gross unrealized appreciation (depreciation) related to fixed maturities as well as related OTTI recognized in AOCI.

As discussed in Note 3 c), if a credit loss is indicated on an impaired fixed maturity, an OTTI is considered to have occurred and the portion of the impairment not related to credit losses (non-credit OTTI) is recognized in OCI. Included in the "OTTI Recognized in AOCI" column above is the cumulative amount of non-credit OTTI recognized in OCI adjusted for subsequent sales, maturities, and redemptions. OTTI Recognized in AOCI does not include the impact of subsequent changes in fair value of the related securities. In periods subsequent to a recognition of OTTI in OCI, changes in the fair value of the related fixed maturities are reflected in Unrealized appreciation (depreciation) in the statement of comprehensive income. For the three and six months ended June 30, 2010, $33 million and $96 million, respectively, of net unrealized appreciation related to such securities is included in OCI. At June 30, 2010, and December 31, 2009, AOCI includes net unrealized depreciation of $143 million and $162 million, respectively, related to securities remaining in the investment portfolio at those dates for which ACE has recognized a non-credit OTTI.

The following table presents fixed maturities at June 30, 2010, and December 31, 2009, by contractual maturity. Expected maturities could differ from contractual maturities because borrowers may have the right to call or prepay obligations, with or without call or prepayment penalties.

b) Equity securities

The following table presents the fair value and cost of and gross unrealized appreciation (depreciation) related to equity securities at June 30, 2010, and December 31, 2009.

c) Net realized gains (losses)

The Company adopted provisions included in ASC Topic 320, Investments-Debt and Equity Securities, (Topic 320) related to the recognition and presentation of OTTI as at April 1, 2009. Under these provisions, when an OTTI related to a fixed maturity has occurred, ACE is required to record the OTTI in net income if the Company has the intent to sell the security or it is more likely than not that it will be required to sell the security. Further, in cases where the Company does not intend to sell the security and it is more likely than not that it will not be required to sell the security, ACE must evaluate the security to determine the portion of the impairment, if any, related to credit losses. If a credit loss is indicated, an OTTI is considered to have occurred and any portion of the OTTI related to credit losses must be reflected in net income while the portion of OTTI related to all other factors is recognized in OCI. For fixed maturities held to maturity, OTTI recognized in OCI is accreted from AOCI to the amortized cost of the fixed maturity prospectively over the remaining term of the securities. For fixed maturities, prior to this adoption, ACE was required to record OTTI in net income unless the Company had the intent and ability to hold the impaired security to recovery. These provisions do not have any impact on the accounting for OTTI for any other type of investment.

The cumulative effect recorded at the date of adoption, April 1, 2009, reflected a reduction to AOCI and an increase to Retained earnings of $267 million. These adjustments reflected the Company's best estimate at the adoption date of the net of tax amount ($349 million pre-tax) of OTTI recognized in net income prior to the adoption related to fixed maturities held at the adoption date that had not suffered a credit loss, the Company did not intend to sell, and it was more likely than not that ACE would not be required to sell before the recovery of their amortized cost. Retained earnings and Deferred tax assets as at April 1, 2009, were also reduced by $46 million as a result of an increase in the Company's valuation allowance against deferred tax assets, which was a direct effect of the adoption.  In the quarter following the period of initial adoption, the cumulative effect of adoption was ultimately adjusted by $25 million ($44 million pre-tax). The $44 million pre-tax adjustment reflected the true-up of ACE's prior estimate of reversals of non-credit OTTI for securities impaired prior to 2006 (Pre-2006 OTTI) for which a detailed review of securities held at the adoption date of the new OTTI standards was not completed until the third quarter of 2009.  Upon completion of the detailed review of securities held at the adoption date, ACE determined that fewer Pre-2006 OTTI securities were held than previously estimated, which resulted in an overstatement of the original reversal estimate of non-credit OTTI on Pre-2006 OTTI.  The adjustment resulted in an increase to AOCI and an offsetting decrease in Retained earnings with no impact on net income or shareholders' equity.

Each quarter, the Company reviews its securities in an unrealized loss position (impaired securities), including fixed maturities, securities lending collateral, equity securities, and other investments, to identify those impaired securities to be specifically evaluated for a potential OTTI.

For impaired fixed maturities, the Company assesses OTTI based on the provisions of Topic 320 as described above. The factors that the Company considers when determining if a credit loss exists related to a fixed maturity are discussed in "Evaluation of potential credit losses related to fixed maturities" below. Prior to the adoption, when evaluating fixed maturities for OTTI, the Company principally considered its ability and intent to hold the impaired security to the expected recovery period, the issuer's financial condition, and the Company's assessment (using available market information such as credit ratings) of the issuer's ability to make future scheduled principal and interest payments on a timely basis.

The Company reviews all non-fixed maturities for OTTI based on the following:

• the amount of time a security has been in a loss position and the magnitude of the loss position;
• the period in which cost is expected to be recovered, if at all, based on various criteria including economic conditions and other issuer-specific developments; and
• the Company's ability and intent to hold the security to the expected recovery period.

ACE, as a general rule, also considers that equity securities in an unrealized loss position for twelve consecutive months are impaired.

Evaluation of potential credit losses related to fixed maturities

ACE reviews each fixed maturity in an unrealized loss position to assess whether the security is a candidate for credit loss. Specifically, ACE considers credit rating, market price, and issuer-specific financial information, among other factors, to assess the likelihood of collection of all principal and interest as contractually due. Securities for which ACE determines that credit loss is likely are subjected to further analysis to estimate the credit loss recognized in net income, if any. In general, credit loss recognized in net income equals the difference between the security's amortized cost and the net present value of its projected future cash flows discounted at the effective interest rate implicit in the debt security. The specific methodologies and significant assumptions used by asset class are discussed below. All significant assumptions used in determining credit losses are subject to change as market conditions evolve.

U.S. Treasury and agency obligations (including agency mortgage-backed securities), foreign government obligations, and states, municipalities, and political subdivisions obligations

U.S. Treasury and agency obligations (including agency mortgage-backed securities), foreign government obligations, and states, municipalities, and political subdivisions obligations represent less than $20 million of gross unrealized loss at June 30, 2010. These securities were evaluated for credit loss primarily using qualitative assessments of the likelihood of credit loss considering credit rating of the issuers and level of credit enhancement, if any. ACE concluded that the high level of credit worthiness of the issuers coupled with credit enhancement, where applicable, supports recognizing no credit loss in net income.

Corporate securities

Projected cash flows for corporate securities (principally senior unsecured bonds) are driven primarily by assumptions regarding probability of default and also the timing and amount of recoveries associated with defaults. ACE develops these estimates using information based on market observable data, issuer-specific information, and credit ratings. ACE developed its default assumption by using historical default data by Moody's Investors Service (Moody's) rating category to calculate a 1-in-100 year probability of default, which results in a default assumption in excess of the historical mean default rate. ACE believes that use of a default assumption in excess of the historical mean is reasonable in light of recent market conditions. The following table presents default assumptions by Moody's rating category (historical mean default rate provided for comparison).

Consistent with management's approach to developing default rate assumptions considering recent market conditions, ACE assumed a 25 percent recovery rate (the par value of a defaulted security that will be recovered) across all rating categories rather than using Moody's historical mean recovery rate of 40 percent. ACE believes that use of a recovery rate assumption lower than the historical mean is reasonable in light of recent market conditions.

Application of the methodology and assumptions described above resulted in credit losses recognized in net income for corporate securities for the three and six months ended June 30, 2010, of $Nil and $1 million, respectively. Credit losses recognized in net income for corporate securities from the date of adoption to June 30, 2009, were $34 million.

Mortgage-backed securities

For mortgage-backed securities, credit impairment is assessed using a cash flow model that estimates the cash flows on the underlying mortgages, using the security-specific collateral and transaction structure. The model estimates cash flows from the underlying mortgage loans and distributes those cash flows to various tranches of securities, considering the transaction structure and any subordination and credit enhancements that exist in that structure. The cash flow model incorporates actual cash flows on the mortgage-backed securities through the current period and then projects the remaining cash flows using a number of assumptions, including default rates, prepayment rates, and loss severity rates (the par value of a defaulted security that will not be recovered) on foreclosed properties.

ACE develops specific assumptions using market data, where available, and includes internal estimates as well as estimates published by rating agencies and other third-party sources. ACE projects default rates by mortgage sector considering current underlying mortgage loan performance, generally assuming:

• lower loss severity for Prime sector bonds versus ALT-A, Sub-prime, and Option ARM sector bonds; and
• lower loss severity for older vintage securities versus more recent vintage securities, which reflects the recent decline in underwriting standards.

These estimates are extrapolated along a default timing curve to estimate the total lifetime pool default rate. Other assumptions used contemplate the actual collateral attributes, including geographic concentrations, rating agency loss projections, rating actions, and current market prices. If cash flow projections indicate that losses will exceed the credit enhancement for a given tranche, then the Company does not expect to recover its amortized cost basis and recognizes an estimated credit loss in net income.

The following table presents the significant assumptions used to estimate future cash flows for specific mortgage-backed securities evaluated for potential credit loss at June 30, 2010, by sector and vintage.

(1) Prime, ALT-A, and Sub-prime sector bonds are categorized based on credit worthiness of the borrower. Option ARM sector bonds are categorized based on the type of mortgage product, rather than credit worthiness of the borrower.

(2) Default rate and loss severity rate assumptions vary within a given sector and vintage depending upon the geographic concentration of the collateral underlying the bond and the level of serious delinquencies, among other factors.

Application of the methodology and assumptions described above resulted in credit losses recognized in net income for mortgage-backed securities for the three and six months ended June 30, 2010, of $5 million and $22 million, respectively. Credit losses recognized in net income for mortgage-backed securities from the date of adoption to June 30, 2009, were $26 million.

The following table presents, for the periods indicated, the Net realized gains (losses) and the losses included in Net realized gains (losses) and OCI as a result of conditions which caused the Company to conclude the decline in fair value of certain investments was "other-than-temporary".

The following table presents, for the periods indicated, a roll forward of pre-tax credit losses related to fixed maturities for which a portion of OTTI was recognized in OCI. For 2009, the roll forward is presented from April 1, 2009, the date of adoption of the then new OTTI standard, to June 30, 2009.

d) Gross unrealized loss

At June 30, 2010, there were 3,023 fixed maturities out of a total of 18,992 fixed maturities in an unrealized loss position. The largest single unrealized loss in the fixed maturities was $10 million.  Fixed maturities in an unrealized loss position at June 30, 2010, were comprised of both investment grade and below investment grade securities for which fair value declined primarily due to widening credit spreads since the date of purchase and included non-agency mortgage-backed securities that suffered a decline in value since their original date of purchase.   

The following tables present, for all securities in an unrealized loss position at June 30, 2010, and December 31, 2009 (including securities on loan), the aggregate fair value and gross unrealized loss by length of time the security has continuously been in an unrealized loss position.

e) Restricted assets

The Company is required to maintain assets on deposit with various regulatory authorities to support its insurance and reinsurance operations. These requirements are generally promulgated in the statutory regulations of the individual jurisdictions. The assets on deposit are available to settle insurance and reinsurance liabilities. The Company also utilizes trust funds in certain large reinsurance transactions where the trust funds are set up for the benefit of the ceding companies and generally take the place of letter of credit (LOC) requirements. The Company also has investments in segregated portfolios primarily to provide collateral or guarantees for LOCs and derivative transactions. Included in restricted assets at June 30, 2010, are fixed maturities and short-term investments totaling $12.1 billion and cash of $165 million. The following table presents the components of the restricted assets at June 30, 2010, and December 31, 2009.

4. Assumed life reinsurance programs involving minimum benefit guarantees under annuity contracts

The following table presents income and expenses relating to guaranteed minimum death benefits (GMDB) and guaranteed minimum income benefits (GMIB) reinsurance

At June 30, 2010, reported liabilities for GMDB and GMIB reinsurance were $197 million and $776 million, respectively, compared with $212 million and $559 million, respectively, at December 31, 2009. The reported liability for GMIB reinsurance of $776 million at June 30, 2010, and $559 million at December 31, 2009, includes a fair value derivative adjustment of $648 million and $443 million, respectively. Reported liabilities for both GMDB and GMIB reinsurance are determined using internal valuation models. Such valuations require considerable judgment and are subject to significant uncertainty. The valuation of these products is subject to fluctuations arising from, among other factors, changes in interest rates, changes in equity markets, changes in credit markets, changes in the allocation of the investments underlying annuitant's account values, and assumptions regarding future policyholder behavior. These models and the related assumptions are continually reviewed by management and enhanced, as appropriate, based upon improvements in modeling assumptions and availability of more information, such as market conditions and demographics of in-force annuities.

GMDB reinsurance

At June 30, 2010, and December 31, 2009, the Company's net amount at risk from its GMDB reinsurance programs was $4.2 billion and $3.8 billion, respectively.  For GMDB reinsurance programs, the net amount at risk is defined as the present value of future claim payments under the following assumptions:

• policy account values and guaranteed values are fixed at the valuation date (June 30, 2010, and December 31, 2009, respectively);

• there are no lapses or withdrawals;

• mortality according to 100 percent of the Annuity 2000 mortality table; and

• future claims are discounted in line with the discounting assumption used in the calculation of the benefit reserve averaging between 3 to 4 percent.

At June 30, 2010, if all of the Company's cedants' policyholders covered under GMDB reinsurance agreements were to die immediately, the total claim amount payable by the Company, taking into account all appropriate claims limits, would be approximately $1.4 billion. As a result of the annual claim limits on the GMDB reinsurance agreements, the claims payable are lower in this case than if all the policyholders were to die over time, all else equal.

GMIB reinsurance

At June 30, 2010, and December 31, 2009, the Company's net amount at risk from its GMIB reinsurance programs was $1.1 billion and $683 million, respectively. For GMIB reinsurance programs, the net amount at risk is defined as the present value of future claim payments under the following assumptions:

• policy account values and guaranteed values are fixed at the valuation date (June 30, 2010, and December 31, 2009, respectively);

• there are no deaths, lapses, or withdrawals;

• policyholders annuitize at a frequency most disadvantageous to ACE (in other words, annuitization at a level that maximizes claims taking into account the treaty limits) under the terms of the Company's reinsurance contracts;

• for annuitizing policyholders, the GMIB claim is calculated using interest rates in line with those used in calculating the reserve; and

• future claims are discounted in line with the discounting assumption used in the calculation of the benefit reserve averaging between 2 to 3 percent.

The average attained age of all policyholders under all benefits reinsured, weighted by the guaranteed value of each reinsured policy, is approximately 66.

5. Commitments, contingencies, and guarantees

a) Derivative instruments

Derivative instruments employed

The Company maintains positions in derivative instruments such as futures, options, swaps, and foreign currency forward contracts for which the primary purposes are to manage duration and foreign currency exposure, yield enhancement, or to obtain an exposure to a particular financial market. Along with convertible bonds and to be announced mortgage-backed securities (TBA), discussed below, these are the most numerous and frequent derivative transactions.

ACE maintains positions in convertible bond investments that contain embedded derivatives. In addition, the Company purchases TBAs as part of its investing activities. These securities are included within the Company's fixed maturities available for sale (FM AFS) portfolio.

Under reinsurance programs covering living benefit guarantees, the Company assumes the risk of GMIBs associated with variable annuity contracts. The GMIB risk is triggered if, at the time the contract holder elects to convert the accumulated account value to a periodic payment stream (annuitize), the accumulated account value is not sufficient to provide a guaranteed minimum level of monthly income. The Company's GMIB reinsurance product meets the definition of a derivative instrument. Benefit reserves in respect of GMIBs are classified as Future policy benefits (FPB) while the fair value derivative adjustment is classified within Accounts payable, accrued expenses, and other liabilities (AP). The Company also maintains positions in exchange-traded equity futures contracts and options on equity market indices to limit equity and interest rate exposure in the GMDB and GMIB block of business.

In relation to certain debt issuances, the Company has entered into interest rate swap transactions for the purpose of either fixing or reducing borrowing costs. Although the use of these interest rate swaps has the economic effect of fixing or reducing borrowing costs on a net basis, gross interest expense on the related debt issuances is included in Interest expense while the settlements related to the interest rate swaps are reflected in Net realized gains (losses) in the consolidated statements of operations. ACE buys credit default swaps to mitigate global credit risk exposure, primarily related to reinsurance recoverable.

The Company carries all derivative instruments at fair value with changes in fair value recorded in Net realized gains (losses) in the consolidated statements of operations. None of the derivative instruments are used as hedges for accounting purposes.

The following table presents the balance sheet locations, fair values in an asset or (liability) position, and notional values/payment provisions of the Company's derivative instruments at June 30, 2010, and December 31, 2009.