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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
Mar. 31, 2017
Mar. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period $ 223 $ 58
Realized investment gains (losses) included in earnings 38 126
Unrealized gains (losses) included in other comprehensive income (loss) 7 25
Purchases 37 0
Issuances 0 0
Sales (1) 0
Settlements (9) (4)
Transfers into Level 3 0 0
Transfers out of Level 3 0  
Balance, end of period 295 205
Change in unrealized gains (losses) still held 38 126
Foreign currency swaps    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Balance, beginning of period [1] (21) (192)
Realized gains or losses included in earnings [1] 38 125
Unrealized gains or losses included in other comprehensive income (loss) [1] 2 4
Purchases [1] 0 0
Issuances [1] 0 0
Sales [1] 0 0
Settlements [1] 0 0
Transfers into Level 3 [1] 0 0
Transfers out of Level 3 [1] 0  
Balance, end of period [1] 19 (63)
Changes in unrealized gain (losses) still held [1] 38 125
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
Realized gains or losses included in earnings [1] 0 1
Unrealized gains or losses included in other comprehensive income (loss) [1] 0 0
Purchases [1] 0 0
Issuances [1] 0 0
Sales [1] 0 0
Settlements [1] 0 0
Transfers into Level 3 [1] 0 0
Transfers out of Level 3 [1] 0  
Balance, end of period [1] 2 2
Changes in unrealized gain (losses) still held [1] 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 198 220
Realized investment gains (losses) included in earnings 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 6 21
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements (9) (4)
Transfers into Level 3 0 0
Transfers out of Level 3 0  
Balance, end of period 195 237
Change in unrealized gains (losses) still held 0 0
Fixed maturities | Public utilities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 16 0
Realized investment gains (losses) included in earnings 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 0 0
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0  
Balance, end of period 16 0
Change in unrealized gains (losses) still held 0 0
Fixed maturities | Banks/financial institutions    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 25 26
Realized investment gains (losses) included in earnings 0 0
Unrealized gains (losses) included in other comprehensive income (loss) (1) 0
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0  
Balance, end of period 24 26
Change in unrealized gains (losses) still held 0 0
Fixed maturities | Other corporate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 0  
Realized investment gains (losses) included in earnings 0  
Unrealized gains (losses) included in other comprehensive income (loss) 0  
Purchases 35  
Issuances 0  
Sales 0  
Settlements 0  
Transfers into Level 3 0  
Transfers out of Level 3 0  
Balance, end of period 35  
Change in unrealized gains (losses) still held 0  
Equity securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period 3 3
Realized investment gains (losses) included in earnings 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 0 0
Purchases 2 0
Issuances 0 0
Sales (1) 0
Settlements 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0  
Balance, end of period 4 3
Change in unrealized gains (losses) still held $ 0 $ 0
[1] Derivative assets and liabilities are presented net