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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 | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Assets: |  |
Available-for-sale Securities | $ 83,799 | $ 67,794
Asset derivatives | 1,662 | 676
Other Investments | 299 | 176
Cash and cash equivalents | 5,270 | 4,350
Total assets | 91,030 | 72,996
Liabilities: |  |
Liability derivatives | 601 | 371
Total liabilities | 601 | 371
Foreign currency swaps |  |
Assets: |  |
Asset derivatives | 460 | 563
Liabilities: |  |
Liability derivatives | 436 | 314
Foreign currency forwards |  |
Assets: |  |
Asset derivatives | 1,189 | 107
Liabilities: |  |
Liability derivatives | 109 | 49
Foreign currency options |  |
Assets: |  |
Asset derivatives | 10 | 5
Liabilities: |  |
Liability derivatives | 56 | 8
Credit default swaps |  |
Assets: |  |
Asset derivatives | 3 | 1
Fixed maturities |  |
Assets: |  |
Available-for-sale Securities | 80,527 | 65,349
Fixed maturities | Government and agencies |  |
Assets: |  |
Available-for-sale Securities | 27,406 | 19,276
Fixed maturities | Municipalities |  |
Assets: |  |
Available-for-sale Securities | 1,353 | 1,208
Fixed maturities | Mortgage- and asset-backed securities |  |
Assets: |  |
Available-for-sale Securities | 1,228 | 582
Fixed maturities | Public utilities |  |
Assets: |  |
Available-for-sale Securities | 8,509 | 7,479
Fixed maturities | Sovereign and supranational |  |
Assets: |  |
Available-for-sale Securities | 1,598 | 1,407
Fixed maturities | Banks/financial institutions |  |
Assets: |  |
Available-for-sale Securities | 6,344 | 6,019
Fixed maturities | Other corporate |  |
Assets: |  |
Available-for-sale Securities | 34,089 | 29,378
Perpetual securities |  |
Assets: |  |
Available-for-sale Securities | 1,994 | 1,947
Perpetual securities | Banks/financial institutions |  |
Assets: |  |
Available-for-sale Securities | 1,768 | 1,742
Perpetual securities | Other corporate |  |
Assets: |  |
Available-for-sale Securities | 226 | 205
Equity securities |  |
Assets: |  |
Available-for-sale Securities | 1,278 | 498
Level 1 |  |
Assets: |  |
Available-for-sale Securities | 27,806 | 19,158
Asset derivatives | 0 | 0
Other Investments | 299 | 176
Cash and cash equivalents | 5,270 | 4,350
Total assets | 33,375 | 23,684
Liabilities: |  |
Total liabilities | 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 | 0
Liabilities: |  |
Liability derivatives | 0 | 0
Level 1 | Foreign currency options |  |
Assets: |  |
Asset derivatives | 0 | 0
Liabilities: |  |
Liability derivatives | 0 | 0
Level 1 | Credit default swaps |  |
Assets: |  |
Asset derivatives | 0 | 0
Level 1 | Fixed maturities |  |
Assets: |  |
Available-for-sale Securities | 26,537 | 18,669
Level 1 | Fixed maturities | Government and agencies |  |
Assets: |  |
Available-for-sale Securities | 26,537 | 18,669
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 | 1,269 | 489
Level 2 |  |
Assets: |  |
Available-for-sale Securities | 55,724 | 48,387
Asset derivatives | 1,494 | 574
Other Investments | 0 | 0
Cash and cash equivalents | 0 | 0
Total assets | 57,218 | 48,961
Liabilities: |  |
Total liabilities | 477 | 78
Level 2 | Foreign currency swaps |  |
Assets: |  |
Asset derivatives | 295 | 462
Liabilities: |  |
Liability derivatives | 312 | 21
Level 2 | Foreign currency forwards |  |
Assets: |  |
Asset derivatives | 1,189 | 107
Liabilities: |  |
Liability derivatives | 109 | 49
Level 2 | Foreign currency options |  |
Assets: |  |
Asset derivatives | 10 | 5
Liabilities: |  |
Liability derivatives | 56 | 8
Level 2 | Credit default swaps |  |
Assets: |  |
Asset derivatives | 0 | 0
Level 2 | Fixed maturities |  |
Assets: |  |
Available-for-sale Securities | 53,724 | 46,434
Level 2 | Fixed maturities | Government and agencies |  |
Assets: |  |
Available-for-sale Securities | 869 | 607
Level 2 | Fixed maturities | Municipalities |  |
Assets: |  |
Available-for-sale Securities | 1,353 | 1,208
Level 2 | Fixed maturities | Mortgage- and asset-backed securities |  |
Assets: |  |
Available-for-sale Securities | 988 | 362
Level 2 | Fixed maturities | Public utilities |  |
Assets: |  |
Available-for-sale Securities | 8,509 | 7,479
Level 2 | Fixed maturities | Sovereign and supranational |  |
Assets: |  |
Available-for-sale Securities | 1,598 | 1,407
Level 2 | Fixed maturities | Banks/financial institutions |  |
Assets: |  |
Available-for-sale Securities | 6,318 | 5,993
Level 2 | Fixed maturities | Other corporate |  |
Assets: |  |
Available-for-sale Securities | 34,089 | 29,378
Level 2 | Perpetual securities |  |
Assets: |  |
Available-for-sale Securities | 1,994 | 1,947
Level 2 | Perpetual securities | Banks/financial institutions |  |
Assets: |  |
Available-for-sale Securities | 1,768 | 1,742
Level 2 | Perpetual securities | Other corporate |  |
Assets: |  |
Available-for-sale Securities | 226 | 205
Level 2 | Equity securities |  |
Assets: |  |
Available-for-sale Securities | 6 | 6
Level 3 |  |
Assets: |  |
Available-for-sale Securities | 269 | 249
Asset derivatives | 168 | 102
Other Investments | 0 | 0
Cash and cash equivalents | 0 | 0
Total assets | 437 | 351
Liabilities: |  |
Total liabilities | 124 | 293
Level 3 | Foreign currency swaps |  |
Assets: |  |
Asset derivatives | 165 | 101
Liabilities: |  |
Liability derivatives | 124 | 293
Level 3 | Foreign currency forwards |  |
Assets: |  |
Asset derivatives | 0 | 0
Liabilities: |  |
Liability derivatives | 0 | 0
Level 3 | Foreign currency options |  |
Assets: |  |
Asset derivatives | 0 | 0
Liabilities: |  |
Liability derivatives | 0 | 0
Level 3 | Credit default swaps |  |
Assets: |  |
Asset derivatives | 3 | 1
Level 3 | Fixed maturities |  |
Assets: |  |
Available-for-sale Securities | 266 | 246
Level 3 | Fixed maturities | Government and agencies |  |
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 | 240 | 220
Level 3 | Fixed maturities | Public utilities |  |
Assets: |  |
Available-for-sale Securities | 0 | 0
Level 3 | Fixed maturities | Sovereign and supranational |  |
Assets: |  |
Available-for-sale Securities | 0 | 0
Level 3 | Fixed maturities | Banks/financial institutions |  |
Assets: |  |
Available-for-sale Securities | 26 | 26
Level 3 | Fixed maturities | Other corporate |  |
Assets: |  |
Available-for-sale Securities | 0 | 0
Level 3 | Perpetual securities |  |
Assets: |  |
Available-for-sale Securities | 0 | 0
Level 3 | Perpetual securities | Banks/financial institutions |  |
Assets: |  |
Available-for-sale Securities | 0 | 0
Level 3 | Perpetual securities | Other corporate |  |
Assets: |  |
Available-for-sale Securities | 0 | 0
Level 3 | Equity securities |  |
Assets: |  |
Available-for-sale Securities | $ 3 | $ 3

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