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Fair Value - Reconciliations of Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Corporate Bonds and Other [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance $ 222 $ 98
Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses), Included in Net Income (Loss)   (1)
Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses), Included in OCI 33 (4)
Purchases 256 117
Sales   (5)
Settlements (11) (9)
Transfers into Level 3   35
Transfers out of Level 3 (32) (9)
Ending balance 468 222
Unrealized Gains (Losses) Recognized in other Comprehensive Income (Loss) on Level 3 Assets and Liabilities 28 (5)
States, Municipalities and Political Subdivisions [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance   1
Settlements   (1)
Total Asset-Backed [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 197 335
Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses), Included in Net Income (Loss)   5
Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses), Included in OCI 8 (8)
Purchases 48 162
Sales   (72)
Settlements (16) (64)
Transfers into Level 3 45 42
Transfers out of Level 3 (117) (203)
Ending balance 165 197
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities   (2)
Unrealized Gains (Losses) Recognized in other Comprehensive Income (Loss) on Level 3 Assets and Liabilities 7 (4)
Total Fixed Maturities Available-for-Sale [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 419 434
Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses), Included in Net Income (Loss)   4
Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses), Included in OCI 41 (12)
Purchases 304 279
Sales   (77)
Settlements (27) (74)
Transfers into Level 3 45 77
Transfers out of Level 3 (149) (212)
Ending balance 633 419
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities   (2)
Unrealized Gains (Losses) Recognized in other Comprehensive Income (Loss) on Level 3 Assets and Liabilities 35 (9)
Fixed Maturities Trading [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 6 4
Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses), Included in Net Income (Loss) (2) 3
Sales   (1)
Ending balance 4 6
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities (2) 2
Fixed Maturity Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 425 438
Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses), Included in Net Income (Loss) (2) 7
Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses), Included in OCI 41 (12)
Purchases 304 279
Sales   (78)
Settlements (27) (74)
Transfers into Level 3 45 77
Transfers out of Level 3 (149) (212)
Ending balance 637 425
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities (2)  
Unrealized Gains (Losses) Recognized in other Comprehensive Income (Loss) on Level 3 Assets and Liabilities 35 (9)
Equity Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 19 22
Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses), Included in Net Income (Loss) (2) (2)
Purchases 2  
Sales   (1)
Ending balance 19 19
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities $ (2) $ (2)