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FAIR VALUE MEASUREMENTS - Changes in Available-For-Sale Investments and Derivatives Classified as Level 3 (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period $ 205 $ 118 $ 58 $ 189
Realized investment gains (losses) included in earnings 122 58 268 (24)
Unrealized gains (losses) included in other comprehensive income (loss) 25 (8) 31 (12)
Purchases 0 0 0 0
Issuances 0 0 0 0
Sales 0 (147) 0 (147)
Settlements (11) (1) (16) 14
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance, end of period 341 20 341 20
Change in unrealized gains (losses) still held 122 58 268 (24)
Foreign currency swaps        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance, beginning of period [1] (63) (283) (192) (212)
Realized gains or losses included in earnings [1] 123 58 268 (25)
Unrealized gains or losses included in other comprehensive income (loss) [1] (1) 2 (16) (2)
Purchases [1] 0 0 0 0
Issuances [1] 0 0 0 0
Sales [1] 0 0 0 0
Settlements [1] 0 0 (1) 16
Transfers into Level 3 [1] 0 0 0 0
Transfers out of Level 3 [1] 0 0 0 0
Balance, end of period [1] 59 (223) 59 (223)
Changes in unrealized gain (losses) still held [1] 123 58 268 (25)
Credit default swaps        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance, beginning of period [1] 2 1 1 0
Realized gains or losses included in earnings [1] (1) 0 0 1
Unrealized gains or losses included in other comprehensive income (loss) [1] 0 0 0 0
Purchases [1] 0 0 0 0
Issuances [1] 0 0 0 0
Sales [1] 0 0 0 0
Settlements [1] 0 0 0 0
Transfers into Level 3 [1] 0 0 0 0
Transfers out of Level 3 [1] 0 0 0 0
Balance, end of period [1] 1 1 1 1
Changes in unrealized gain (losses) still held [1] (1) 0 0 1
Fixed maturities | Mortgage- and asset-backed securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period 237 221 220 223
Realized investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 26 (6) 47 (7)
Purchases 0 0 0 0
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements (11) (1) (15) (2)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance, end of period 252 214 252 214
Change in unrealized gains (losses) still held 0 0 0 0
Fixed maturities | Banks/financial institutions        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period 26 26 26 26
Realized investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 0 (1) 0 (1)
Purchases 0 0 0 0
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance, end of period 26 25 26 25
Change in unrealized gains (losses) still held 0 0 0 0
Perpetual securities | Banks/financial institutions        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period 0 150 0 149
Realized investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 0 (3) 0 (2)
Purchases 0 0 0 0
Issuances 0 0 0 0
Sales 0 (147) 0 (147)
Settlements 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance, end of period 0 0 0 0
Change in unrealized gains (losses) still held 0 0 0 0
Equity securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period 3 3 3 3
Realized investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 0 0 0 0
Purchases 0 0 0 0
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance, end of period 3 3 3 3
Change in unrealized gains (losses) still held $ 0 $ 0 $ 0 $ 0
[1] Derivative assets and liabilities are presented net