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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, 2013 | Dec. 31, 2012
--- | --- | ---
Assets: |  |
Available-for-sale Securities | $ 59,433 | $ 61,578
Asset derivatives | 430 | 345
Cash and cash equivalents | 2,596 | 2,041
Total assets | 62,459 | 63,964
Liabilities: |  |
Total liabilities | 643 | 934
Interest rate swaps |  |
Assets: |  |
Asset derivatives | 26 | 32
Liabilities: |  |
Liability derivatives | 1 | 3
Foreign currency swaps |  |
Assets: |  |
Asset derivatives | 381 | 311
Liabilities: |  |
Liability derivatives | 314 | 329
Foreign currency forwards |  |
Assets: |  |
Asset derivatives | 19 |
Liabilities: |  |
Liability derivatives | 272 | 535
Foreign currency options |  |
Assets: |  |
Asset derivatives | 2 |
Credit default swaps |  |
Assets: |  |
Asset derivatives | 2 | 2
Liabilities: |  |
Liability derivatives | 56 | 67
Fixed Maturities |  |
Assets: |  |
Available-for-sale Securities | 56,276 | 57,253
Fixed Maturities | Government and Agencies Debt Securities |  |
Assets: |  |
Available-for-sale Securities | 12,894 | 12,997
Fixed Maturities | Municipalities |  |
Assets: |  |
Available-for-sale Securities | 1,161 | 1,195
Fixed Maturities | Mortgage- and asset-backed Securities |  |
Assets: |  |
Available-for-sale Securities | 954 | 1,031
Fixed Maturities | Public Utilities |  |
Assets: |  |
Available-for-sale Securities | 8,150 | 8,497
Fixed Maturities | Sovereign and Supranational |  |
Assets: |  |
Available-for-sale Securities | 1,752 | 2,072
Fixed Maturities | Banks/financial Institutions |  |
Assets: |  |
Available-for-sale Securities | 6,971 | 7,634
Fixed Maturities | Other Corporate |  |
Assets: |  |
Available-for-sale Securities | 24,394 | 23,827
Perpetual Securities |  |
Assets: |  |
Available-for-sale Securities | 3,133 | 4,302
Perpetual Securities | Banks/financial Institutions |  |
Assets: |  |
Available-for-sale Securities | 2,915 | 3,950
Perpetual Securities | Other Corporate |  |
Assets: |  |
Available-for-sale Securities | 218 | 352
Equity Securities |  |
Assets: |  |
Available-for-sale Securities | 24 | 23
Level 1 |  |
Assets: |  |
Available-for-sale Securities | 12,205 | 12,278
Asset derivatives | 0 | 0
Cash and cash equivalents | 2,596 | 2,041
Total assets | 14,801 | 14,319
Liabilities: |  |
Total liabilities | 0 | 0
Level 1 | Interest rate swaps |  |
Assets: |  |
Asset derivatives | 0 | 0
Liabilities: |  |
Liability derivatives | 0 | 0
Level 1 | Foreign currency swaps |  |
Assets: |  |
Asset derivatives | 0 | 0
Liabilities: |  |
Liability derivatives | 0 | 0
Level 1 | Foreign currency forwards |  |
Assets: |  |
Asset derivatives | 0 |
Liabilities: |  |
Liability derivatives | 0 | 0
Level 1 | Foreign currency options |  |
Assets: |  |
Asset derivatives | 0 |
Level 1 | Credit default swaps |  |
Assets: |  |
Asset derivatives | 0 | 0
Liabilities: |  |
Liability derivatives | 0 | 0
Level 1 | Fixed Maturities |  |
Assets: |  |
Available-for-sale Securities | 12,190 | 12,265
Level 1 | Fixed Maturities | Government and Agencies Debt Securities |  |
Assets: |  |
Available-for-sale Securities | 12,190 | 12,265
Level 1 | Fixed Maturities | Municipalities |  |
Assets: |  |
Available-for-sale Securities | 0 | 0
Level 1 | Fixed Maturities | Mortgage- and asset-backed Securities |  |
Assets: |  |
Available-for-sale Securities | 0 | 0
Level 1 | Fixed Maturities | Public Utilities |  |
Assets: |  |
Available-for-sale Securities | 0 | 0
Level 1 | Fixed Maturities | Sovereign and Supranational |  |
Assets: |  |
Available-for-sale Securities | 0 | 0
Level 1 | Fixed Maturities | Banks/financial Institutions |  |
Assets: |  |
Available-for-sale Securities | 0 | 0
Level 1 | Fixed Maturities | Other Corporate |  |
Assets: |  |
Available-for-sale Securities | 0 | 0
Level 1 | Perpetual Securities |  |
Assets: |  |
Available-for-sale Securities | 0 | 0
Level 1 | Perpetual Securities | Banks/financial Institutions |  |
Assets: |  |
Available-for-sale Securities | 0 | 0
Level 1 | Perpetual Securities | Other Corporate |  |
Assets: |  |
Available-for-sale Securities | 0 | 0
Level 1 | Equity Securities |  |
Assets: |  |
Available-for-sale Securities | 15 | 13
Level 2 |  |
Assets: |  |
Available-for-sale Securities | 46,759 | 45,895
Asset derivatives | 272 | 154
Cash and cash equivalents | 0 | 0
Total assets | 47,031 | 46,049
Liabilities: |  |
Total liabilities | 272 | 535
Level 2 | Interest rate swaps |  |
Assets: |  |
Asset derivatives | 0 | 0
Liabilities: |  |
Liability derivatives | 0 | 0
Level 2 | Foreign currency swaps |  |
Assets: |  |
Asset derivatives | 251 | 154
Liabilities: |  |
Liability derivatives | 0 | 0
Level 2 | Foreign currency forwards |  |
Assets: |  |
Asset derivatives | 19 |
Liabilities: |  |
Liability derivatives | 272 | 535
Level 2 | Foreign currency options |  |
Assets: |  |
Asset derivatives | 2 |
Level 2 | Credit default swaps |  |
Assets: |  |
Asset derivatives | 0 | 0
Liabilities: |  |
Liability derivatives | 0 | 0
Level 2 | Fixed Maturities |  |
Assets: |  |
Available-for-sale Securities | 43,621 | 41,802
Level 2 | Fixed Maturities | Government and Agencies Debt Securities |  |
Assets: |  |
Available-for-sale Securities | 704 | 732
Level 2 | Fixed Maturities | Municipalities |  |
Assets: |  |
Available-for-sale Securities | 1,161 | 1,195
Level 2 | Fixed Maturities | Mortgage- and asset-backed Securities |  |
Assets: |  |
Available-for-sale Securities | 515 | 693
Level 2 | Fixed Maturities | Public Utilities |  |
Assets: |  |
Available-for-sale Securities | 8,150 | 8,077
Level 2 | Fixed Maturities | Sovereign and Supranational |  |
Assets: |  |
Available-for-sale Securities | 1,752 | 1,654
Level 2 | Fixed Maturities | Banks/financial Institutions |  |
Assets: |  |
Available-for-sale Securities | 6,945 | 6,610
Level 2 | Fixed Maturities | Other Corporate |  |
Assets: |  |
Available-for-sale Securities | 24,394 | 22,841
Level 2 | Perpetual Securities |  |
Assets: |  |
Available-for-sale Securities | 3,133 | 4,087
Level 2 | Perpetual Securities | Banks/financial Institutions |  |
Assets: |  |
Available-for-sale Securities | 2,915 | 3,735
Level 2 | Perpetual Securities | Other Corporate |  |
Assets: |  |
Available-for-sale Securities | 218 | 352
Level 2 | Equity Securities |  |
Assets: |  |
Available-for-sale Securities | 5 | 6
Level 3 |  |
Assets: |  |
Available-for-sale Securities | 469 | 3,405
Asset derivatives | 158 | 191
Cash and cash equivalents | 0 | 0
Total assets | 627 | 3,596
Liabilities: |  |
Total liabilities | 371 | 399
Level 3 | Interest rate swaps |  |
Assets: |  |
Asset derivatives | 26 | 32
Liabilities: |  |
Liability derivatives | 1 | 3
Level 3 | Foreign currency swaps |  |
Assets: |  |
Asset derivatives | 130 | 157
Liabilities: |  |
Liability derivatives | 314 | 329
Level 3 | Foreign currency forwards |  |
Assets: |  |
Asset derivatives | 0 |
Liabilities: |  |
Liability derivatives | 0 | 0
Level 3 | Foreign currency options |  |
Assets: |  |
Asset derivatives | 0 |
Level 3 | Credit default swaps |  |
Assets: |  |
Asset derivatives | 2 | 2
Liabilities: |  |
Liability derivatives | 56 | 67
Level 3 | Fixed Maturities |  |
Assets: |  |
Available-for-sale Securities | 465 | 3,186
Level 3 | Fixed Maturities | Government and Agencies Debt Securities |  |
Assets: |  |
Available-for-sale Securities | 0 | 0
Level 3 | Fixed Maturities | Municipalities |  |
Assets: |  |
Available-for-sale Securities | 0 | 0
Level 3 | Fixed Maturities | Mortgage- and asset-backed Securities |  |
Assets: |  |
Available-for-sale Securities | 439 | 338
Level 3 | Fixed Maturities | Public Utilities |  |
Assets: |  |
Available-for-sale Securities | 0 | 420
Level 3 | Fixed Maturities | Sovereign and Supranational |  |
Assets: |  |
Available-for-sale Securities | 0 | 418
Level 3 | Fixed Maturities | Banks/financial Institutions |  |
Assets: |  |
Available-for-sale Securities | 26 | 1,024
Level 3 | Fixed Maturities | Other Corporate |  |
Assets: |  |
Available-for-sale Securities | 0 | 986
Level 3 | Perpetual Securities |  |
Assets: |  |
Available-for-sale Securities | 0 | 215
Level 3 | Perpetual Securities | Banks/financial Institutions |  |
Assets: |  |
Available-for-sale Securities | 0 | 215
Level 3 | Perpetual Securities | Other Corporate |  |
Assets: |  |
Available-for-sale Securities | 0 | 0
Level 3 | Equity Securities |  |
Assets: |  |
Available-for-sale Securities | $ 4 | $ 4

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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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 2: 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 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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