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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, 2017 | Dec. 31, 2016
--- | --- | ---
Assets: |  |
Available-for-sale Securities | $ 83,206 | $ 76,702
Asset derivatives | 479 | 1,207
Other Investments | 57 | 276
Cash and cash equivalents | 4,927 | 4,859
Total assets | 88,669 | 83,044
Liabilities: |  |
Liability derivatives | 974 | 1,998
Total liabilities | 974 | 1,998
Foreign currency swaps |  |
Assets: |  |
Asset derivatives | 301 | 490
Liabilities: |  |
Liability derivatives | 196 | 230
Foreign currency forwards |  |
Assets: |  |
Asset derivatives | 160 | 672
Liabilities: |  |
Liability derivatives | 754 | 1,717
Foreign currency options |  |
Assets: |  |
Asset derivatives | 17 | 43
Liabilities: |  |
Liability derivatives | 24 | 51
Credit default swaps |  |
Assets: |  |
Asset derivatives | 1 | 2
Fixed maturities |  |
Assets: |  |
Available-for-sale Securities | 80,415 | 73,760
Fixed maturities | Government and agencies |  |
Assets: |  |
Available-for-sale Securities | 30,038 | 26,214
Fixed maturities | Municipalities |  |
Assets: |  |
Available-for-sale Securities | 1,292 | 1,295
Fixed maturities | Mortgage- and asset-backed securities |  |
Assets: |  |
Available-for-sale Securities | 456 | 1,337
Fixed maturities | Public utilities |  |
Assets: |  |
Available-for-sale Securities | 8,015 | 7,683
Fixed maturities | Sovereign and supranational |  |
Assets: |  |
Available-for-sale Securities | 2,029 | 1,469
Fixed maturities | Banks/financial institutions |  |
Assets: |  |
Available-for-sale Securities | 7,010 | 6,063
Fixed maturities | Other corporate |  |
Assets: |  |
Available-for-sale Securities | 31,575 | 29,699
Perpetual securities |  |
Assets: |  |
Available-for-sale Securities | 1,863 | 1,633
Perpetual securities | Banks/financial institutions |  |
Assets: |  |
Available-for-sale Securities | 1,627 | 1,420
Perpetual securities | Other corporate |  |
Assets: |  |
Available-for-sale Securities | 236 | 213
Equity securities |  |
Assets: |  |
Available-for-sale Securities | 928 | 1,309
Level 1 |  |
Assets: |  |
Available-for-sale Securities | 29,972 | 26,687
Asset derivatives | 0 | 0
Other Investments | 57 | 276
Cash and cash equivalents | 4,927 | 4,859
Total assets | 34,956 | 31,822
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 | 29,067 | 25,387
Level 1 | Fixed maturities | Government and agencies |  |
Assets: |  |
Available-for-sale Securities | 29,067 | 25,387
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 | 905 | 1,300
Level 2 |  |
Assets: |  |
Available-for-sale Securities | 52,834 | 49,773
Asset derivatives | 331 | 1,080
Other Investments | 0 | 0
Cash and cash equivalents | 0 | 0
Total assets | 53,165 | 50,853
Liabilities: |  |
Total liabilities | 842 | 1,852
Level 2 | Foreign currency swaps |  |
Assets: |  |
Asset derivatives | 154 | 365
Liabilities: |  |
Liability derivatives | 64 | 84
Level 2 | Foreign currency forwards |  |
Assets: |  |
Asset derivatives | 160 | 672
Liabilities: |  |
Liability derivatives | 754 | 1,717
Level 2 | Foreign currency options |  |
Assets: |  |
Asset derivatives | 17 | 43
Liabilities: |  |
Liability derivatives | 24 | 51
Level 2 | Credit default swaps |  |
Assets: |  |
Asset derivatives | 0 | 0
Level 2 | Fixed maturities |  |
Assets: |  |
Available-for-sale Securities | 50,966 | 48,134
Level 2 | Fixed maturities | Government and agencies |  |
Assets: |  |
Available-for-sale Securities | 971 | 827
Level 2 | Fixed maturities | Municipalities |  |
Assets: |  |
Available-for-sale Securities | 1,292 | 1,295
Level 2 | Fixed maturities | Mortgage- and asset-backed securities |  |
Assets: |  |
Available-for-sale Securities | 278 | 1,139
Level 2 | Fixed maturities | Public utilities |  |
Assets: |  |
Available-for-sale Securities | 7,938 | 7,667
Level 2 | Fixed maturities | Sovereign and supranational |  |
Assets: |  |
Available-for-sale Securities | 2,029 | 1,469
Level 2 | Fixed maturities | Banks/financial institutions |  |
Assets: |  |
Available-for-sale Securities | 6,985 | 6,038
Level 2 | Fixed maturities | Other corporate |  |
Assets: |  |
Available-for-sale Securities | 31,473 | 29,699
Level 2 | Perpetual securities |  |
Assets: |  |
Available-for-sale Securities | 1,863 | 1,633
Level 2 | Perpetual securities | Banks/financial institutions |  |
Assets: |  |
Available-for-sale Securities | 1,627 | 1,420
Level 2 | Perpetual securities | Other corporate |  |
Assets: |  |
Available-for-sale Securities | 236 | 213
Level 2 | Equity securities |  |
Assets: |  |
Available-for-sale Securities | 5 | 6
Level 3 |  |
Assets: |  |
Available-for-sale Securities | 400 | 242
Asset derivatives | 148 | 127
Other Investments | 0 | 0
Cash and cash equivalents | 0 | 0
Total assets | 548 | 369
Liabilities: |  |
Total liabilities | 132 | 146
Level 3 | Foreign currency swaps |  |
Assets: |  |
Asset derivatives | 147 | 125
Liabilities: |  |
Liability derivatives | 132 | 146
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 | 1 | 2
Level 3 | Fixed maturities |  |
Assets: |  |
Available-for-sale Securities | 382 | 239
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 | 178 | 198
Level 3 | Fixed maturities | Public utilities |  |
Assets: |  |
Available-for-sale Securities | 77 | 16
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 | 25 | 25
Level 3 | Fixed maturities | Other corporate |  |
Assets: |  |
Available-for-sale Securities | 102 | 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 | $ 18 | $ 3

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