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FAIR VALUE MEASUREMENTS - Changes in Investments and Derivatives Carried at Fair Value Classified as Level 3 (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period $ 453 $ 223
Realized investment gains (losses) included in earnings 126 38
Unrealized gains (losses) included in other comprehensive income (loss) 13 7
Purchases 16 37
Issuances 0 0
Sales 0 (1)
Settlements (1) (9)
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Balance, end of period 607 295
Change in unrealized gains (losses) still held 126 38
Foreign currency swaps    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Balance, beginning of period [1] 22 (21)
Realized gains or losses included in earnings [1] 126 38
Unrealized gains or losses included in other comprehensive income (loss) [1] 6 2
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 0
Balance, end of period [1] 154 19
Changes in unrealized gain (losses) still held [1] 126 38
Credit default swaps    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Balance, beginning of period [1] 1 2
Realized gains or losses included in earnings [1] 0 0
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 0
Balance, end of period [1] 1 2
Changes in unrealized gain (losses) still held [1] 0 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 175 198
Realized investment gains (losses) included in earnings 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 11 6
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements 0 (9)
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Balance, end of period 186 195
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 68 16
Realized investment gains (losses) included in earnings 0 0
Unrealized gains (losses) included in other comprehensive income (loss) (1) 0
Purchases 16 0
Issuances 0 0
Sales 0 0
Settlements 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Balance, end of period 83 16
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 25
Realized investment gains (losses) included in earnings 0 0
Unrealized gains (losses) included in other comprehensive income (loss) (1) (1)
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Balance, end of period 24 24
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 146 0
Realized investment gains (losses) included in earnings 0 0
Unrealized gains (losses) included in other comprehensive income (loss) (2) 0
Purchases 0 35
Issuances 0 0
Sales 0 0
Settlements (1) 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Balance, end of period 143 35
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 16 3
Realized investment gains (losses) included in earnings 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 0 0
Purchases 0 2
Issuances 0 0
Sales 0 (1)
Settlements 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Balance, end of period 16 4
Change in unrealized gains (losses) still held $ 0 $ 0
[1] Derivative assets and liabilities are presented net