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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period $ 695 $ 769 $ 810 $ 648
Net investment gains (losses) included in earnings 23 (84) (184) (68)
Unrealized gains (losses) included in other comprehensive income (loss) 44 7 17 25
Purchases 39 33 155 140
Issuances 0 0 0 0
Sales (5) 0 (6) (2)
Settlements (2) (2) (7) (4)
Transfers into Level 3 0 1 24 142
Transfers out of Level 3 0 (1) (15) (158)
Balance, end of period 794 723 794 723
Change in unrealized gains (losses) still held 23 (84) (184) (68)
Foreign currency swaps        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance, beginning of period [1] (168) 94 43 80
Net investment gains (losses) included in earnings [1] 23 (84) (184) (68)
Unrealized gains or losses included in other comprehensive income (loss) [1] 2 (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] (143) 8 (143) 8
Changes in unrealized gain (losses) still held [1] 23 (84) (184) (68)
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 188 183 178 177
Net investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 3 0 5 6
Purchases 0 0 0 0
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements 0 0 (1) 0
Transfers into Level 3 0 0 9 [2] 0
Transfers out of Level 3 0 0 0 0
Balance, end of period 191 183 191 183
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 322 204 224 109
Net investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 15 4 6 10
Purchases 33 0 129 0
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements (2) (2) (6) (4)
Transfers into Level 3 0 0 15 [3] 116 [3]
Transfers out of Level 3 0 0 0 (25) [3]
Balance, end of period 368 206 368 206
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 24 23 23
Net investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 0 0 0 1
Purchases 0 0 1 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 (1) [3] 0 (1)
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 243 199 262 213
Net investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 24 5 8 12
Purchases 1 19 13 107
Issuances 0 0 0 0
Sales 0 0 0 (2)
Settlements 0 0 0 0
Transfers into Level 3 0 1 [3] 0 26 [3]
Transfers out of Level 3 0 0 (15) [3] (132) [3],[4]
Balance, end of period 268 224 268 224
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 86 65 80 46
Net investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 0 0 0 0
Purchases 5 14 12 33
Issuances 0 0 0 0
Sales (5) 0 (6) 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 86 79 86 79
Change in unrealized gains (losses) still held $ 0 $ 0 $ 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