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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period $ 630 $ 366 $ 453 $ 223
Realized investment gains (losses) included in earnings (20) 7 63 35
Unrealized gains (losses) included in other comprehensive income (loss) (14) (1) (13) 7
Purchases 0 53 96 177
Issuances 0 0 0 0
Sales 0 (1) 0 (2)
Settlements (1) (8) (4) (24)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance, end of period 595 416 595 416
Change in unrealized gains (losses) still held (20) 7 63 35
Foreign currency swaps        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance, beginning of period [1] 110 7 22 (21)
Realized gains or losses included in earnings [1] (19) 8 65 36
Unrealized gains or losses included in other comprehensive income (loss) [1] (2) 0 2 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] 89 15 89 15
Changes in unrealized gain (losses) still held [1] (19) 8 65 36
Credit default swaps        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance, beginning of period [1] 0 2 1 2
Realized gains or losses included in earnings [1] 0 (1) (1) (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 1 0 1
Changes in unrealized gain (losses) still held [1] 0 (1) (1) (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 178 188 175 198
Realized investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) (6) (2) (3) 4
Purchases 0 0 0 0
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements 0 (8) 0 (24)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance, end of period 172 178 172 178
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 106 53 68 16
Realized investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) (2) 0 (4) 0
Purchases 0 24 40 61
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 104 77 104 77
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 25 25 25
Realized investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) 0 0 (2) 0
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 23 25 23 25
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 196 77 146 0
Realized investment gains (losses) included in earnings 0 0 0 0
Unrealized gains (losses) included in other comprehensive income (loss) (4) 1 (6) 3
Purchases 0 25 55 100
Issuances 0 0 0 0
Sales 0 (1) 0 (1)
Settlements (1) 0 (4) 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Balance, end of period 191 102 191 102
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 17 14 16 3
Realized investment gains (losses) included in earnings (1) 0 (1) 0
Unrealized gains (losses) included in other comprehensive income (loss) 0 0 0 0
Purchases 0 4 1 16
Issuances 0 0 0 0
Sales 0 0 0 (1)
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 16 18 16 18
Change in unrealized gains (losses) still held $ (1) $ 0 $ (1) $ 0
[1] Derivative assets and liabilities are presented net