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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, 2019
Dec. 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 (34) 52
Unrealized gains (losses) included in other comprehensive income (loss) 12 6
Purchases 247 127
Issuances 0 0
Sales (41) 0
Settlements (6) (6)
Transfers into Level 3 142 16
Transfers out of Level 3 (158) 0
Balance, end of period 810 648
Change in unrealized gains (losses) still held (33) 52
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 (losses) included in earnings [1] (33) 54
Unrealized gains (losses) included in other comprehensive income (loss) [1] (4) 4
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] 43 80
Change in unrealized gains (losses) still held [1] (33) 54
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 (losses) included in earnings [1] 0 (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 0
Change in unrealized gains (losses) still held [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 177 175
Realized investment gains (losses) included in earnings 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 1 2
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 178 177
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) 6 1
Purchases 48 40
Issuances 0 0
Sales (24) 0
Settlements (6) 0
Transfers into Level 3 116 [2] 0
Transfers out of Level 3 (25) [2] 0
Balance, end of period 224 109
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) 1 (2)
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 (1) 0
Balance, end of period 23 23
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 (1) 0
Unrealized gains (losses) included in other comprehensive income (loss) 8 1
Purchases 165 56
Issuances 0 0
Sales (17) 0
Settlements 0 (6)
Transfers into Level 3 26 [2] 16
Transfers out of Level 3 (132) [2],[3] 0
Balance, end of period 262 213
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 (1)
Unrealized gains (losses) included in other comprehensive income (loss) 0 0
Purchases 34 31
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 80 46
Change in unrealized gains (losses) still held $ 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