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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, 2020
Mar. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period $ 810 $ 648
Net investment gains (losses) included in earnings (185) (8)
Unrealized gains (losses) included in other comprehensive income (loss) (28) 1
Purchases 85 63
Issuances 0 0
Sales 0 (2)
Settlements (1) 0
Transfers into Level 3 9 25
Transfers out of Level 3 0 (41)
Balance, end of period 690 686
Change in unrealized gains (losses) still held (185) (8)
Foreign currency swaps    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Balance, beginning of period [1] 43 80
Net investment gains (losses) included in earnings [1] (185) (8)
Unrealized gains or losses included in other comprehensive income (loss) [1] (4) (2)
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] (146) 70
Changes in unrealized gain (losses) still held [1] (185) (8)
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
Net investment gains (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 0
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 178 177
Net investment gains (losses) included in earnings 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 1 1
Purchases 0 0
Issuances 0 0
Sales 0 0
Settlements 0 0
Transfers into Level 3 9 [2] 0
Transfers out of Level 3 0 0
Balance, end of period 188 178
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 224 109
Net investment gains (losses) included in earnings 0 0
Unrealized gains (losses) included in other comprehensive income (loss) (8) 1
Purchases 83 0
Issuances 0 0
Sales 0 0
Settlements (1) 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 (25) [3]
Balance, end of period 298 85
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 23
Net 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 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 262 213
Net investment gains (losses) included in earnings 0 0
Unrealized gains (losses) included in other comprehensive income (loss) (17) 1
Purchases 0 63
Issuances 0 0
Sales 0 (2)
Settlements 0 0
Transfers into Level 3 0 25 [3]
Transfers out of Level 3 0 (16) [4]
Balance, end of period 245 284
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 80 46
Net investment gains (losses) included in earnings 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 0 0
Purchases 2 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 82 46
Change in unrealized gains (losses) still held $ 0 $ 0
[1] Derivative assets and liabilities are presented net
[2] Transfer due to reclassification of level 3 securities from HTM to AFS
[3] Transfer due to sector classification change
[4] Transfer due to availability of observable market inputs