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FAIR VALUE MEASUREMENTS - Fair Value Hierarchy Levels of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Level 3 |  |
Assets: |  |
Total assets | $ 3,926 |
Liabilities: |  |
Total liabilities | 419 |
Fair Value, Measurements, Recurring |  |
Assets: |  |
Swaps | 318 | 375
Cash and cash equivalents | 2,210 | 2,249
Total assets | 54,427 | 56,660
Liabilities: |  |
Total liabilities | 428 | 531
Fair Value, Measurements, Recurring | Interest rate swaps |  |
Assets: |  |
Swaps | 31 | 34
Liabilities: |  |
Swaps | 3 | 4
Fair Value, Measurements, Recurring | Foreign currency swaps |  |
Assets: |  |
Swaps | 287 | 341
Liabilities: |  |
Swaps | 328 | 397
Fair Value, Measurements, Recurring | Credit default swaps |  |
Liabilities: |  |
Swaps | 97 | 130
Fair Value, Measurements, Recurring | Fixed Maturities |  |
Assets: |  |
Available-for-sale Securities | 46,522 | 47,572
Fair Value, Measurements, Recurring | Fixed Maturities | Government and Agencies Debt Securities |  |
Assets: |  |
Available-for-sale Securities | 10,729 | 11,813
Fair Value, Measurements, Recurring | Fixed Maturities | Municipalities |  |
Assets: |  |
Available-for-sale Securities | 1,163 | 1,159
Fair Value, Measurements, Recurring | Fixed Maturities | Mortgage- and asset-backed Securities |  |
Assets: |  |
Available-for-sale Securities | 1,264 | 1,338
Fair Value, Measurements, Recurring | Fixed Maturities | Public Utilities |  |
Assets: |  |
Available-for-sale Securities | 7,335 | 7,225
Fair Value, Measurements, Recurring | Fixed Maturities | Sovereign and Supranational |  |
Assets: |  |
Available-for-sale Securities | 2,205 | 2,308
Fair Value, Measurements, Recurring | Fixed Maturities | Banks/financial Institutions |  |
Assets: |  |
Available-for-sale Securities | 7,709 | 7,453
Fair Value, Measurements, Recurring | Fixed Maturities | Other Corporate |  |
Assets: |  |
Available-for-sale Securities | 16,117 | 16,276
Fair Value, Measurements, Recurring | Perpetual Securities |  |
Assets: |  |
Available-for-sale Securities | 5,352 | 6,439
Fair Value, Measurements, Recurring | Perpetual Securities | Banks/financial Institutions |  |
Assets: |  |
Available-for-sale Securities | 5,001 | 6,078
Fair Value, Measurements, Recurring | Perpetual Securities | Other Corporate |  |
Assets: |  |
Available-for-sale Securities | 351 | 361
Fair Value, Measurements, Recurring | Equity Securities |  |
Assets: |  |
Available-for-sale Securities | 25 | 25
Fair Value, Measurements, Recurring | Level 1 |  |
Assets: |  |
Swaps | 0 | 0
Cash and cash equivalents | 2,210 | 2,249
Total assets | 12,190 | 13,356
Liabilities: |  |
Total liabilities | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Interest rate swaps |  |
Assets: |  |
Swaps | 0 | 0
Liabilities: |  |
Swaps | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Foreign currency swaps |  |
Assets: |  |
Swaps | 0 | 0
Liabilities: |  |
Swaps | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Credit default swaps |  |
Liabilities: |  |
Swaps | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Fixed Maturities |  |
Assets: |  |
Available-for-sale Securities | 9,965 | 11,092
Fair Value, Measurements, Recurring | Level 1 | Fixed Maturities | Government and Agencies Debt Securities |  |
Assets: |  |
Available-for-sale Securities | 9,965 | 11,092
Fair Value, Measurements, Recurring | Level 1 | Fixed Maturities | Municipalities |  |
Assets: |  |
Available-for-sale Securities | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Fixed Maturities | Mortgage- and asset-backed Securities |  |
Assets: |  |
Available-for-sale Securities | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Fixed Maturities | Public Utilities |  |
Assets: |  |
Available-for-sale Securities | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Fixed Maturities | Sovereign and Supranational |  |
Assets: |  |
Available-for-sale Securities | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Fixed Maturities | Banks/financial Institutions |  |
Assets: |  |
Available-for-sale Securities | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Fixed Maturities | Other Corporate |  |
Assets: |  |
Available-for-sale Securities | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Perpetual Securities |  |
Assets: |  |
Available-for-sale Securities | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Perpetual Securities | Banks/financial Institutions |  |
Assets: |  |
Available-for-sale Securities | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Perpetual Securities | Other Corporate |  |
Assets: |  |
Available-for-sale Securities | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Equity Securities |  |
Assets: |  |
Available-for-sale Securities | 15 | 15
Fair Value, Measurements, Recurring | Level 2 |  |
Assets: |  |
Swaps | 47 | 0
Cash and cash equivalents | 0 | 0
Total assets | 38,311 | 38,970
Liabilities: |  |
Total liabilities | 9 | 0
Fair Value, Measurements, Recurring | Level 2 | Interest rate swaps |  |
Assets: |  |
Swaps | 0 | 0
Liabilities: |  |
Swaps | 0 | 0
Fair Value, Measurements, Recurring | Level 2 | Foreign currency swaps |  |
Assets: |  |
Swaps | 47 | 0
Liabilities: |  |
Swaps | 9 | 0
Fair Value, Measurements, Recurring | Level 2 | Credit default swaps |  |
Liabilities: |  |
Swaps | 0 | 0
Fair Value, Measurements, Recurring | Level 2 | Fixed Maturities |  |
Assets: |  |
Available-for-sale Securities | 33,231 | 33,051
Fair Value, Measurements, Recurring | Level 2 | Fixed Maturities | Government and Agencies Debt Securities |  |
Assets: |  |
Available-for-sale Securities | 764 | 721
Fair Value, Measurements, Recurring | Level 2 | Fixed Maturities | Municipalities |  |
Assets: |  |
Available-for-sale Securities | 1,163 | 1,159
Fair Value, Measurements, Recurring | Level 2 | Fixed Maturities | Mortgage- and asset-backed Securities |  |
Assets: |  |
Available-for-sale Securities | 897 | 944
Fair Value, Measurements, Recurring | Level 2 | Fixed Maturities | Public Utilities |  |
Assets: |  |
Available-for-sale Securities | 6,926 | 6,803
Fair Value, Measurements, Recurring | Level 2 | Fixed Maturities | Sovereign and Supranational |  |
Assets: |  |
Available-for-sale Securities | 1,787 | 1,874
Fair Value, Measurements, Recurring | Level 2 | Fixed Maturities | Banks/financial Institutions |  |
Assets: |  |
Available-for-sale Securities | 6,612 | 6,379
Fair Value, Measurements, Recurring | Level 2 | Fixed Maturities | Other Corporate |  |
Assets: |  |
Available-for-sale Securities | 15,082 | 15,171
Fair Value, Measurements, Recurring | Level 2 | Perpetual Securities |  |
Assets: |  |
Available-for-sale Securities | 5,027 | 5,913
Fair Value, Measurements, Recurring | Level 2 | Perpetual Securities | Banks/financial Institutions |  |
Assets: |  |
Available-for-sale Securities | 4,676 | 5,552
Fair Value, Measurements, Recurring | Level 2 | Perpetual Securities | Other Corporate |  |
Assets: |  |
Available-for-sale Securities | 351 | 361
Fair Value, Measurements, Recurring | Level 2 | Equity Securities |  |
Assets: |  |
Available-for-sale Securities | 6 | 6
Fair Value, Measurements, Recurring | Level 3 |  |
Assets: |  |
Swaps | 271 | 375
Cash and cash equivalents | 0 | 0
Total assets | 3,926 | 4,334
Liabilities: |  |
Total liabilities | 419 | 531
Fair Value, Measurements, Recurring | Level 3 | Interest rate swaps |  |
Assets: |  |
Swaps | 31 | 34
Liabilities: |  |
Swaps | 3 | 4
Fair Value, Measurements, Recurring | Level 3 | Foreign currency swaps |  |
Assets: |  |
Swaps | 240 | 341
Liabilities: |  |
Swaps | 319 | 397
Fair Value, Measurements, Recurring | Level 3 | Credit default swaps |  |
Liabilities: |  |
Swaps | 97 | 130
Fair Value, Measurements, Recurring | Level 3 | Fixed Maturities |  |
Assets: |  |
Available-for-sale Securities | 3,326 | 3,429
Fair Value, Measurements, Recurring | Level 3 | Fixed Maturities | Government and Agencies Debt Securities |  |
Assets: |  |
Available-for-sale Securities | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Fixed Maturities | Municipalities |  |
Assets: |  |
Available-for-sale Securities | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Fixed Maturities | Mortgage- and asset-backed Securities |  |
Assets: |  |
Available-for-sale Securities | 367 | 394
Fair Value, Measurements, Recurring | Level 3 | Fixed Maturities | Public Utilities |  |
Assets: |  |
Available-for-sale Securities | 409 | 422
Fair Value, Measurements, Recurring | Level 3 | Fixed Maturities | Sovereign and Supranational |  |
Assets: |  |
Available-for-sale Securities | 418 | 434
Fair Value, Measurements, Recurring | Level 3 | Fixed Maturities | Banks/financial Institutions |  |
Assets: |  |
Available-for-sale Securities | 1,097 | 1,074
Fair Value, Measurements, Recurring | Level 3 | Fixed Maturities | Other Corporate |  |
Assets: |  |
Available-for-sale Securities | 1,035 | 1,105
Fair Value, Measurements, Recurring | Level 3 | Perpetual Securities |  |
Assets: |  |
Available-for-sale Securities | 325 | 526
Fair Value, Measurements, Recurring | Level 3 | Perpetual Securities | Banks/financial Institutions |  |
Assets: |  |
Available-for-sale Securities | 325 | 526
Fair Value, Measurements, Recurring | Level 3 | Perpetual Securities | Other Corporate |  |
Assets: |  |
Available-for-sale Securities | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Equity Securities |  |
Assets: |  |
Available-for-sale Securities | 4 | 4
Carrying Value |  |
Assets: |  |
Swaps | 318 | 375
Liabilities: |  |
Swaps | $ 428 | $ 531

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6379932&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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