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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
Dec. 31, 2015
Dec. 31, 2014
Assets:    
Available-for-sale Securities $ 67,794 $ 68,270
Asset derivatives 676 802
Other Investments 176 171
Cash and cash equivalents 4,350 4,658
Total assets 72,996 73,901
Liabilities:    
Liability derivatives 371 2,423
Total Liabilities 371 2,423
Foreign currency swaps    
Assets:    
Asset derivatives 563 746
Liabilities:    
Liability derivatives 314 318
Foreign currency forwards    
Assets:    
Asset derivatives 107 56
Liabilities:    
Liability derivatives 49 1,912
Foreign currency options    
Assets:    
Asset derivatives 5  
Liabilities:    
Liability derivatives 8 33
Credit default swaps    
Assets:    
Asset derivatives 1  
Interest rate swaptions    
Liabilities:    
Liability derivatives   160
Fixed maturities    
Assets:    
Available-for-sale Securities 65,349 65,573
Fixed maturities | Government and agencies    
Assets:    
Available-for-sale Securities 19,276 19,198
Fixed maturities | Municipalities    
Assets:    
Available-for-sale Securities 1,208 1,257
Fixed maturities | Mortgage- and asset-backed securities    
Assets:    
Available-for-sale Securities 582 602
Fixed maturities | Public utilities    
Assets:    
Available-for-sale Securities 7,479 7,897
Fixed maturities | Sovereign and supranational    
Assets:    
Available-for-sale Securities 1,407 1,416
Fixed maturities | Banks/financial institutions    
Assets:    
Available-for-sale Securities 6,019 6,598
Fixed maturities | Other corporate    
Assets:    
Available-for-sale Securities 29,378 28,605
Perpetual securities    
Assets:    
Available-for-sale Securities 1,947 2,669
Perpetual securities | Banks/financial institutions    
Assets:    
Available-for-sale Securities 1,742 2,438
Perpetual securities | Other corporate    
Assets:    
Available-for-sale Securities 205 231
Equity securities    
Assets:    
Available-for-sale Securities 498 28
Level 1    
Assets:    
Available-for-sale Securities 19,158 18,702
Asset derivatives 0 0
Other Investments 176 171
Cash and cash equivalents 4,350 4,658
Total assets 23,684 23,531
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  
Liabilities:    
Liability derivatives 0 0
Level 1 | Credit default swaps    
Assets:    
Asset derivatives 0  
Level 1 | Interest rate swaptions    
Liabilities:    
Liability derivatives   0
Level 1 | Fixed maturities    
Assets:    
Available-for-sale Securities 18,669 18,683
Level 1 | Fixed maturities | Government and agencies    
Assets:    
Available-for-sale Securities 18,669 18,683
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 489 19
Level 2    
Assets:    
Available-for-sale Securities 48,387 49,167
Asset derivatives 574 696
Other Investments 0 0
Cash and cash equivalents 0 0
Total assets 48,961 49,863
Liabilities:    
Total Liabilities 78 2,105
Level 2 | Foreign currency swaps    
Assets:    
Asset derivatives 462 640
Liabilities:    
Liability derivatives 21 0
Level 2 | Foreign currency forwards    
Assets:    
Asset derivatives 107 56
Liabilities:    
Liability derivatives 49 1,912
Level 2 | Foreign currency options    
Assets:    
Asset derivatives 5  
Liabilities:    
Liability derivatives 8 33
Level 2 | Credit default swaps    
Assets:    
Asset derivatives 0  
Level 2 | Interest rate swaptions    
Liabilities:    
Liability derivatives   160
Level 2 | Fixed maturities    
Assets:    
Available-for-sale Securities 46,434 46,641
Level 2 | Fixed maturities | Government and agencies    
Assets:    
Available-for-sale Securities 607 515
Level 2 | Fixed maturities | Municipalities    
Assets:    
Available-for-sale Securities 1,208 1,257
Level 2 | Fixed maturities | Mortgage- and asset-backed securities    
Assets:    
Available-for-sale Securities 362 379
Level 2 | Fixed maturities | Public utilities    
Assets:    
Available-for-sale Securities 7,479 7,897
Level 2 | Fixed maturities | Sovereign and supranational    
Assets:    
Available-for-sale Securities 1,407 1,416
Level 2 | Fixed maturities | Banks/financial institutions    
Assets:    
Available-for-sale Securities 5,993 6,572
Level 2 | Fixed maturities | Other corporate    
Assets:    
Available-for-sale Securities 29,378 28,605
Level 2 | Perpetual securities    
Assets:    
Available-for-sale Securities 1,947 2,520
Level 2 | Perpetual securities | Banks/financial institutions    
Assets:    
Available-for-sale Securities 1,742 2,289
Level 2 | Perpetual securities | Other corporate    
Assets:    
Available-for-sale Securities 205 231
Level 2 | Equity securities    
Assets:    
Available-for-sale Securities 6 6
Level 3    
Assets:    
Available-for-sale Securities 249 401
Asset derivatives 102 106
Other Investments 0 0
Cash and cash equivalents 0 0
Total assets 351 507
Liabilities:    
Total Liabilities 293 318
Level 3 | Foreign currency swaps    
Assets:    
Asset derivatives 101 106
Liabilities:    
Liability derivatives 293 318
Level 3 | Foreign currency forwards    
Assets:    
Asset derivatives 0 0
Liabilities:    
Liability derivatives 0 0
Level 3 | Foreign currency options    
Assets:    
Asset derivatives 0  
Liabilities:    
Liability derivatives 0 0
Level 3 | Credit default swaps    
Assets:    
Asset derivatives 1  
Level 3 | Interest rate swaptions    
Liabilities:    
Liability derivatives   0
Level 3 | Fixed maturities    
Assets:    
Available-for-sale Securities 246 249
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 220 223
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 0 149
Level 3 | Perpetual securities | Banks/financial institutions    
Assets:    
Available-for-sale Securities 0 149
Level 3 | Perpetual securities | Other corporate    
Assets:    
Available-for-sale Securities 0 0
Level 3 | Equity securities    
Assets:    
Available-for-sale Securities $ 3 $ 3