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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, 2019
Mar. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period $ 648 $ 453
Realized investment gains (losses) included in earnings (8) 126
Unrealized gains (losses) included in other comprehensive income (loss) 1 13
Purchases 63 16
Issuances 0 0
Sales (2) 0
Settlements 0 (1)
Transfers into Level 3 25 0
Transfers out of Level 3 (41) 0
Balance, end of period 686 607
Change in unrealized gains (losses) still held (8) 126
Foreign currency swaps    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Balance, beginning of period [1] 80 22
Realized gains or losses included in earnings [1] (8) 126
Unrealized gains or losses included in other comprehensive income (loss) [1] (2) 6
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] 70 154
Changes in unrealized gain (losses) still held [1] (8) 126
Credit default swaps    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Balance, beginning of period [1] 0 1
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] 0 1
Changes in unrealized gain (losses) still held [1] 0 0
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 177 175
Realized investment gains (losses) included in earnings 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 1 11
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 178 186
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 109 68
Realized investment gains (losses) included in earnings 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 1 (1)
Purchases 0 16
Issuances 0 0
Sales 0 0
Settlements 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 (25) [2] 0
Balance, end of period 85 83
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 23 25
Realized investment gains (losses) included in earnings 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 0 (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 23 24
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 213 146
Realized investment gains (losses) included in earnings 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 1 (2)
Purchases 63 0
Issuances 0 0
Sales (2) 0
Settlements 0 (1)
Transfers into Level 3 25 [2] 0
Transfers out of Level 3 (16) [3] 0
Balance, end of period 284 143
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 46 16
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 0
Balance, end of period 46 16
Change in unrealized gains (losses) still held $ 0 $ 0
[1] Derivative assets and liabilities are presented net
[2] Transfer due to sector classification change
[3] Transfer due to availability of observable market inputs