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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period $ 686 $ 607 $ 648 $ 453
Realized investment gains (losses) included in earnings 24 (43) 16 83
Unrealized gains (losses) included in other comprehensive income (loss) 17 (13) 18 0
Purchases 25 81 107 97
Issuances 19 0 0 0
Sales 0 0 (2) 0
Settlements (2) (2) (2) (3)
Transfers into Level 3 116 0 141 0
Transfers out of Level 3 (116) 0 (157) 0
Balance, end of period 769 630 769 630
Change in unrealized gains (losses) still held 24 (43) 16 83
Foreign currency swaps        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance, beginning of period [1] 70 154 80 22
Realized gains or losses included in earnings [1] 24 (42) 16 84
Unrealized gains or losses included in other comprehensive income (loss) [1] 0 (2) (2) 4
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] 94 110 94 110
Changes in unrealized gain (losses) still held [1] 24 (42) 16 84
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 0 1
Realized gains or losses included in earnings [1] 0 (1) 0 (1)
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 0 0 0
Changes in unrealized gain (losses) still held [1] 0 (1) 0 (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 178 186 177 175
Realized investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 5 (8) 6 3
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 183 178 183 178
Change in unrealized gains (losses) still held 0 0 0 0
Fixed maturity securities | Public utilities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period 85 83 109 68
Realized investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 5 (1) 6 (2)
Purchases 0 24 0 40
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements (2) 0 (2) 0
Transfers into Level 3 116 [2] 0 116 [2] 0
Transfers out of Level 3 0 0 (25) [2] 0
Balance, end of period 204 106 204 106
Change in unrealized gains (losses) still held 0 0 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 24 23 25
Realized investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 1 (1) 1 (2)
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 24 23 24 23
Change in unrealized gains (losses) still held 0 0 0 0
Fixed maturity securities | Other corporate        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period 284 143 213 146
Realized investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 6 (1) 7 (3)
Purchases 25 56 88 56
Issuances 0 0 0 0
Sales 0 0 (2) 0
Settlements 0 (2) 0 (3)
Transfers into Level 3 0 0 25 [2] 0
Transfers out of Level 3 (116) [2] 0 (132) [2],[3] 0
Balance, end of period 199 196 199 196
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 46 16 46 16
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 0 1 19 1
Issuances 19 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 65 17 65 17
Change in unrealized gains (losses) still held $ 0 $ 0 $ 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