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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
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Derivative Instruments [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Derivative financial instruments, net, Beginning balance   $ 1   $ 3
Derivative financial instruments, net, Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss)   (1) $ 1 (4)
Derivative financial instruments, net, Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in OCI   0 0 0
Derivative financial instruments, net, Purchases   0 0 0
Derivative financial instruments, net, Sales     (1) (2)
Derivative financial instruments, net, Settlements   0 0 0
Derivative financial instruments, net, Transfers into Level 3       3
Derivative financial instruments, net, Transfers out of Level 3   0 0 0
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at June 30       (3)
Corporate and Other Bonds [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance $ 100 242 130 168
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss) 1 1 1 1
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in OCI 1 7 2 14
Purchases 13 16 18 163
Sales     (1) (36)
Settlements (11) (5) (36) (15)
Transfers into Level 3 15   15  
Transfers out of Level 3     (10) (34)
Ending balance 119 261 119 261
States, Municipalities and Political Subdivisions [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance 1 2 1 2
Settlements   (1)   (1)
Ending balance 1 1 1 1
Residential Mortgage-Backed [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance 123 134 129 134
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss) 1   3 2
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in OCI 1 (1) 4 (2)
Purchases   5   15
Settlements (7) (1) (18) (10)
Transfers into Level 3 58   58  
Transfers out of Level 3   (58)   (60)
Ending balance 176 79 176 79
Commercial Mortgage-Backed [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance 13 11 13 22
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in OCI (1)   (1)  
Purchases 12 23 12 32
Settlements (2) (8) (2) (17)
Transfers into Level 3 2   2 3
Transfers out of Level 3   (2)   (16)
Ending balance 24 24 24 24
Other Asset-Backed [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance 82 45 57 53
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss) (1)   (2)  
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in OCI 1   1 2
Purchases 27 34 78 69
Sales       (25)
Settlements (4)   (6) (1)
Transfers into Level 3 41   93 2
Transfers out of Level 3   (36) (75) (57)
Ending balance 146 43 146 43
Total Asset-Backed [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance 218 190 199 209
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss)     1 2
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in OCI 1 (1) 4  
Purchases 39 62 90 116
Sales       (25)
Settlements (13) (9) (26) (28)
Transfers into Level 3 101   153 5
Transfers out of Level 3   (96) (75) (133)
Ending balance 346 146 346 146
Total Fixed Maturities Available-for-Sale [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance 319 434 330 379
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss) 1 1 2 3
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in OCI 2 6 6 14
Purchases 52 78 108 279
Sales     (1) (61)
Settlements (24) (15) (62) (44)
Transfers into Level 3 116   168 5
Transfers out of Level 3   (96) (85) (167)
Ending balance 466 408 466 408
Fixed Maturities Trading [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance 5 6 6 85
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss)     (1) 5
Purchases       2
Sales       (86)
Ending balance 5 6 5 6
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at June 30   (1) (1) 3
Fixed Maturity Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance 324 440 336 464
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss) 1 1 1 8
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in OCI 2 6 6 14
Purchases 52 78 108 281
Sales     (1) (147)
Settlements (24) (15) (62) (44)
Transfers into Level 3 116   168 5
Transfers out of Level 3   (96) (85) (167)
Ending balance 471 414 471 414
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at June 30   (1) (1) 3
Equity Securities Available-for-Sale [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance 19 19 19 20
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss)   (1)   (1)
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in OCI   1 2  
Purchases     1  
Sales     (3)  
Ending balance 19 19 19 19
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at June 30   (2)   (2)
Equity Securities Trading [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance 1 2 1 1
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss)       1
Purchases 1 (1) 1  
Sales       (1)
Ending balance 2 1 2 1
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at June 30   (1)    
Equity Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance 20 21 20 21
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss)   (1)    
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in OCI   1 2  
Purchases 1 (1) 2  
Sales     (3) (1)
Ending balance 21 20 21 20
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at June 30   (3)   (2)
Life Settlement Contracts [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance 1 67 58 74
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss)     6 10
Sales $ (1)   (59)  
Settlements     $ (5) (17)
Ending balance   $ 67   67
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at June 30       $ 2