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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period $ 690 $ 686 $ 810 $ 648
Net investment gains (losses) included in earnings (20) 24 (205) 16
Unrealized gains (losses) included in other comprehensive income (loss) 0 17 (29) 18
Purchases 31 25 116 107
Issuances 0 19 0 0
Sales (1) 0 (1) (2)
Settlements (5) (2) (5) (2)
Transfers into Level 3 15 116 24 141
Transfers out of Level 3 (15) (116) (15) (157)
Balance, end of period 695 769 695 769
Change in unrealized gains (losses) still held (20) 24 (205) 16
Foreign currency swaps        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance, beginning of period [1] (146) 70 43 80
Net investment gains (losses) included in earnings [1] (20) 24 (205) 16
Unrealized gains or losses included in other comprehensive income (loss) [1] (2) 0 (6) (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] (168) 94 (168) 94
Changes in unrealized gain (losses) still held [1] (20) 24 (205) 16
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 188 178 178 177
Net investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 1 5 2 6
Purchases 0 0 0 0
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements (1) 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 188 183 188 183
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 298 85 224 109
Net investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 0 5 (9) 6
Purchases 13 0 96 0
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements (4) (2) (4) (2)
Transfers into Level 3 [3] 15 116 15 116
Transfers out of Level 3 0 0 0 (25) [3]
Balance, end of period 322 204 322 204
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 23 23 23
Net investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 0 1 0 1
Purchases 1 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 0 0 0
Balance, end of period 24 24 24 24
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 245 284 262 213
Net investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 1 6 (16) 7
Purchases 12 25 12 88
Issuances 0 0 0 0
Sales 0 0 0 (2)
Settlements 0 0 0 0
Transfers into Level 3 0 0 0 25 [3]
Transfers out of Level 3 [3] (15) (116) (15) (132) [4]
Balance, end of period 243 199 243 199
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 82 46 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 0 7 19
Issuances 0 19 0 0
Sales (1) 0 (1) 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 65 86 65
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