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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period $ 607 $ 295 $ 453 $ 223
Realized investment gains (losses) included in earnings (43) (10) 83 28
Unrealized gains (losses) included in other comprehensive income (loss) (13) 1 0 8
Purchases 81 87 97 124
Issuances 0 0 0 0
Sales 0 0 0 (1)
Settlements (2) (7) (3) (16)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance, end of period 630 366 630 366
Change in unrealized gains (losses) still held (43) (10) 83 28
Foreign currency swaps        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance, beginning of period [1] 154 19 22 (21)
Realized gains or losses included in earnings [1] (42) (10) 84 28
Unrealized gains or losses included in other comprehensive income (loss) [1] (2) (2) 4 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] 110 7 110 7
Changes in unrealized gain (losses) still held [1] (42) (10) 84 28
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 1 2
Realized gains or losses included in earnings [1] (1) 0 (1) 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] 0 2 0 2
Changes in unrealized gain (losses) still held [1] (1) 0 (1) 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 186 195 175 198
Realized investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) (8) 0 3 6
Purchases 0 0 0 0
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements 0 (7) 0 (16)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance, end of period 178 188 178 188
Change in unrealized gains (losses) still held 0 0 0 0
Fixed maturities | Public utilities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period 83 16 68 16
Realized investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) (1) 0 (2) 0
Purchases 24 37 40 37
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 106 53 106 53
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 24 24 25 25
Realized investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) (1) 1 (2) 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 23 25 23 25
Change in unrealized gains (losses) still held 0 0 0 0
Fixed maturities | Other corporate        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period 143 35 146 0
Realized investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) (1) 2 (3) 2
Purchases 56 40 56 75
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements (2) 0 (3) 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance, end of period 196 77 196 77
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 16 4 16 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 1 10 1 12
Issuances 0 0 0 0
Sales 0 0 0 (1)
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 17 14 17 14
Change in unrealized gains (losses) still held $ 0 $ 0 $ 0 $ 0
[1] Derivative assets and liabilities are presented net