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FAIR VALUE MEASUREMENTS - Changes in Investments and Derivatives Carried at Fair Value Classified as Level 3 (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 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 52 42
Unrealized gains (losses) included in other comprehensive income (loss) 6 5
Purchases 127 214
Issuances 0 0
Sales 0 (3)
Settlements (6) (26)
Transfers into Level 3 16 24
Transfers out of Level 3 0 (26)
Balance, end of period 648 453
Change in unrealized gains (losses) still held 52 42
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 (losses) included in earnings [1] 54 43
Unrealized gains (losses) included in other comprehensive income (loss) [1] 4 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] 80 22
Change in unrealized gains (losses) still held [1] 54 43
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 (losses) included in earnings [1] (1) (1)
Unrealized gains (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] 0 1
Change in unrealized gains (losses) still held [1] (1) (1)
Fixed maturity securities | 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) 2 3
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements 0 (26)
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Balance, end of period 177 175
Change in unrealized gains (losses) still held 0 0
Fixed maturity securities | 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 40 76
Issuances 0 0
Sales 0 0
Settlements 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 (24) [2]
Balance, end of period 109 68
Change in unrealized gains (losses) still held 0 0
Fixed maturity securities | 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) (2) 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 0
Balance, end of period 23 25
Change in unrealized gains (losses) still held 0 0
Fixed maturity securities | 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) 1 2
Purchases 56 122
Issuances 0 0
Sales 0 (2)
Settlements (6) 0
Transfers into Level 3 16 24 [2]
Transfers out of Level 3 0 0
Balance, end of period 213 146
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 (1) 0
Unrealized gains (losses) included in other comprehensive income (loss) 0 0
Purchases 31 16
Issuances 0 0
Sales 0 (1)
Settlements 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 (2) [3]
Balance, end of period 46 16
Change in unrealized gains (losses) still held $ (1) $ 0
[1] Derivative assets and liabilities are presented net
[2] Transfer due to sector classification change
[3] Transfer due to change in accounting method