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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
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)   (4)  
Derivative financial instruments, net, Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in OCI 0   0  
Derivative financial instruments, net, Purchases 0   0  
Derivative financial instruments, net, Sales     (2)  
Derivative financial instruments, net, Settlements 0   0  
Derivative financial instruments, net, Transfers into Level 3     3  
Derivative financial instruments, net, Transfers out of Level 3 0   0  
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at September 30     (3)  
Corporate and Other Bonds [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance 242 $ 141 168 $ 162
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss) 1   1 (1)
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in OCI 7   14 (1)
Purchases 16 27 163 39
Sales   (1) (36) (13)
Settlements (5) (11) (15) (32)
Transfers into Level 3       37
Transfers out of Level 3   (3) (34) (38)
Ending balance 261 153 261 153
States, Municipalities and Political Subdivisions [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance 2 85 2 94
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss)       1
Settlements (1)   (1) (10)
Transfers out of Level 3   (24)   (24)
Ending balance 1 61 1 61
Residential Mortgage-Backed [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance 134 207 134 189
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss)   2 2 4
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in OCI (1) (2) (2) (4)
Purchases 5 4 15 76
Settlements (1) (7) (10) (28)
Transfers out of Level 3 (58)   (60) (33)
Ending balance 79 204 79 204
Commercial Mortgage-Backed [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance 11 87 22 83
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss)   5   7
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in OCI   (4)   (4)
Purchases 23 8 32 23
Settlements (8) (15) (17) (17)
Transfers into Level 3     3 17
Transfers out of Level 3 (2) (10) (16) (38)
Ending balance 24 71 24 71
Other Asset-Backed [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance 45 490 53 655
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss)       3
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in OCI   (6) 2 4
Purchases 34 43 69 125
Sales   (20) (25) (254)
Settlements   (32) (1) (52)
Transfers into Level 3     2  
Transfers out of Level 3 (36) (4) (57) (10)
Ending balance 43 471 43 471
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at September 30       (1)
Total Asset-Backed [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance 190 784 209 927
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss)   7 2 14
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in OCI (1) (12)   (4)
Purchases 62 55 116 224
Sales   (20) (25) (254)
Settlements (9) (54) (28) (97)
Transfers into Level 3     5 17
Transfers out of Level 3 (96) (14) (133) (81)
Ending balance 146 746 146 746
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at September 30       (1)
Total Fixed Maturities Available-for-Sale [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance 434 1,010 379 1,183
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss) 1 7 3 14
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in OCI 6 (12) 14 (5)
Purchases 78 82 279 263
Sales   (21) (61) (267)
Settlements (15) (65) (44) (139)
Transfers into Level 3     5 54
Transfers out of Level 3 (96) (41) (167) (143)
Ending balance 408 960 408 960
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at September 30       (1)
Fixed Maturities Trading [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance 6 89 85 90
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss)   (2) 5 (2)
Purchases     2  
Sales   (1) (86) (2)
Ending balance 6 86 6 86
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at September 30 (1) (2) 3 (2)
Fixed Maturity Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance 440 1,099 464 1,273
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss) 1 5 8 12
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in OCI 6 (12) 14 (5)
Purchases 78 82 281 263
Sales   (22) (147) (269)
Settlements (15) (65) (44) (139)
Transfers into Level 3     5 54
Transfers out of Level 3 (96) (41) (167) (143)
Ending balance 414 1,046 414 1,046
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at September 30 (1) (2) 3 (3)
Equity Securities Available-for-Sale [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance 19 16 20 16
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 (1)   (1)
Ending balance 19 15 19 15
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at September 30 (2)   (2)  
Equity Securities Trading [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance 2 1 1 1
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss)   1 1 1
Purchases (1)      
Sales   (2) (1) (2)
Ending balance 1   1  
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at September 30 (1) 1   1
Equity Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance 21 17 21 17
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss) (1) 1   1
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in OCI 1 (1)   (1)
Purchases (1)      
Sales   (2) (1) (2)
Ending balance 20 15 20 15
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at September 30 (3) 1 (2) 1
Life Settlement Contracts [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance 67 75 74 82
Net Realized Gains (Losses) and Net Change in Unrealized Gains (Losses), Included in Net Income (Loss)   5 10 22
Settlements   (6) (17) (30)
Ending balance $ 67 74 67 74
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities Held at September 30   $ 2 $ 2 $ 1