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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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period $ 341 $ 20 $ 58 $ 189
Realized investment gains (losses) included in earnings (16) (14) 252 (38)
Unrealized gains (losses) included in other comprehensive income (loss) 1 6 32 (6)
Purchases 0 0 0 0
Issuances 0 0 0 0
Sales 0 0 0 (147)
Settlements (13) 0 (29) 14
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance, end of period 313 12 313 12
Change in unrealized gains (losses) still held (16) (15) 252 (39)
Foreign currency swaps        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance, beginning of period [1] 59 (223) (192) (212)
Realized gains or losses included in earnings [1] (18) (13) 250 (38)
Unrealized gains or losses included in other comprehensive income (loss) [1] 0 (1) (16) (3)
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] 41 (237) 41 (237)
Changes in unrealized gain (losses) still held [1] (18) (14) 250 (39)
Credit default swaps        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance, beginning of period [1] 1 1 1 0
Realized gains or losses included in earnings [1] 2 (1) 2 0
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] 3 0 3 0
Changes in unrealized gain (losses) still held [1] 2 (1) 2 0
Fixed maturities | Mortgage- and asset-backed securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period 252 214 220 223
Realized investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 1 6 48 (1)
Purchases 0 0 0 0
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements (13) 0 (28) (2)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance, end of period 240 220 240 220
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 25 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 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 26 26 26 26
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     0 149
Realized investment gains (losses) included in earnings     0 0
Unrealized gains (losses) included in other comprehensive income (loss)     0 (2)
Purchases     0 0
Issuances     0 0
Sales     0 (147)
Settlements     0 0
Transfers into Level 3     0 0
Transfers out of Level 3     0 0
Balance, end of period 0 0 0 0
Change in unrealized gains (losses) still held     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