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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 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period $ 769 $ 630 $ 648 $ 453
Realized investment gains (losses) included in earnings (84) (20) (68) 63
Unrealized gains (losses) included in other comprehensive income (loss) 7 (14) 25 (13)
Purchases 33 0 140 96
Issuances 0 0 0 0
Sales 0 0 (2) 0
Settlements (2) (1) (4) (4)
Transfers into Level 3 1 0 142 0
Transfers out of Level 3 (1) 0 (158) 0
Balance, end of period 723 595 723 595
Change in unrealized gains (losses) still held (84) (20) (68) 63
Foreign currency swaps        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance, beginning of period [1] 94 110 80 22
Realized gains or losses included in earnings [1] (84) (19) (68) 65
Unrealized gains or losses included in other comprehensive income (loss) [1] (2) (2) (4) 2
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] 8 89 8 89
Changes in unrealized gain (losses) still held [1] (84) (19) (68) 65
Credit default swaps        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance, beginning of period [1] 0 0 0 1
Realized gains or losses included in earnings [1] 0 0 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 0 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 183 178 177 175
Realized investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 0 (6) 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 183 172 183 172
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 204 106 109 68
Realized investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 4 (2) 10 (4)
Purchases 0 0 0 40
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements (2) 0 (4) 0
Transfers into Level 3 0 0 116 [2] 0
Transfers out of Level 3 0 0 (25) [2] 0
Balance, end of period 206 104 206 104
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 24 23 23 25
Realized investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 0 0 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 (1) [2] 0 (1) 0
Balance, end of period 23 23 23 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 199 196 213 146
Realized investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 5 (4) 12 (6)
Purchases 19 0 107 55
Issuances 0 0 0 0
Sales 0 0 (2) 0
Settlements 0 (1) 0 (4)
Transfers into Level 3 1 [2] 0 26 [2] 0
Transfers out of Level 3 0 0 (132) [2],[3] 0
Balance, end of period 224 191 224 191
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 65 17 46 16
Realized investment gains (losses) included in earnings 0 (1) 0 (1)
Unrealized gains (losses) included in other comprehensive income (loss) 0 0 0 0
Purchases 14 0 33 1
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 79 16 79 16
Change in unrealized gains (losses) still held $ 0 $ (1) $ 0 $ (1)
[1] Derivative assets and liabilities are presented net
[2] Transfer due to sector classification change
[3] Transfer due to availability of observable market inputs