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Investments - Unrealized Losses on AFS Securities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Amortized Cost    
Less Than 12 Months $ 6,798 $ 8,785
12 Months or More 2,040 1,340
Total 8,838 10,125
Fair Value    
Less Than 12 Months 6,739 8,523
12 Months or More 1,969 1,283
Total 8,708 9,806
Unrealized Losses    
Less Than 12 Months (59) (262)
12 Months or More (71) (57)
Total (130) (319)
ABS    
Amortized Cost    
Less Than 12 Months 461 333
12 Months or More 30 103
Total 491 436
Fair Value    
Less Than 12 Months 460 331
12 Months or More 29 101
Total 489 432
Unrealized Losses    
Less Than 12 Months (1) (2)
12 Months or More (1) (2)
Total (2) (4)
CDOs    
Amortized Cost    
Less Than 12 Months 359 316
12 Months or More 1 160
Total 360 476
Fair Value    
Less Than 12 Months 359 315
12 Months or More 1 159
Total 360 474
Unrealized Losses    
Less Than 12 Months 0 (1)
12 Months or More 0 (1)
Total 0 (2)
CMBS    
Amortized Cost    
Less Than 12 Months 1,178 1,018
12 Months or More 243 154
Total 1,421 1,172
Fair Value    
Less Than 12 Months 1,167 997
12 Months or More 228 141
Total 1,395 1,138
Unrealized Losses    
Less Than 12 Months (11) (21)
12 Months or More (15) (13)
Total (26) (34)
Corporate    
Amortized Cost    
Less Than 12 Months 2,322 2,883
12 Months or More 1,064 433
Total 3,386 3,316
Fair Value    
Less Than 12 Months 2,302 2,784
12 Months or More 1,028 403
Total 3,330 3,187
Unrealized Losses    
Less Than 12 Months (20) (99)
12 Months or More (36) (30)
Total (56) (129)
Foreign government/government agencies    
Amortized Cost    
Less Than 12 Months 244 409
12 Months or More 51 21
Total 295 430
Fair Value    
Less Than 12 Months 242 395
12 Months or More 49 19
Total 291 414
Unrealized Losses    
Less Than 12 Months (2) (14)
12 Months or More (2) (2)
Total (4) (16)
Municipal    
Amortized Cost    
Less Than 12 Months 511 1,401
12 Months or More 236 43
Total 747 1,444
Fair Value    
Less Than 12 Months 507 1,338
12 Months or More 228 41
Total 735 1,379
Unrealized Losses    
Less Than 12 Months (4) (63)
12 Months or More (8) (2)
Total (12) (65)
RMBS    
Amortized Cost    
Less Than 12 Months 889 1,107
12 Months or More 137 393
Total 1,026 1,500
Fair Value    
Less Than 12 Months 887 1,089
12 Months or More 135 390
Total 1,022 1,479
Unrealized Losses    
Less Than 12 Months (2) (18)
12 Months or More (2) (3)
Total (4) (21)
US Treasury Securities    
Amortized Cost    
Less Than 12 Months 658 1,047
12 Months or More 254 0
Total 912 1,047
Fair Value    
Less Than 12 Months 652 1,016
12 Months or More 250 0
Total 902 1,016
Unrealized Losses    
Less Than 12 Months (6) (31)
12 Months or More (4) 0
Total (10) (31)
Fixed maturities    
Amortized Cost    
Less Than 12 Months 6,622 8,514
12 Months or More 2,016 1,307
Total 8,638 9,821
Fair Value    
Less Than 12 Months 6,576 8,265
12 Months or More 1,948 1,254
Total 8,524 9,519
Unrealized Losses    
Less Than 12 Months (46) (249)
12 Months or More (68) (53)
Total (114) (302)
Equity securities    
Amortized Cost    
Less Than 12 Months 176 271
12 Months or More 24 33
Total 200 304
Fair Value    
Less Than 12 Months 163 258
12 Months or More 21 29
Total 184 287
Unrealized Losses    
Less Than 12 Months (13) (13)
12 Months or More (3) (4)
Total $ (16) $ (17)