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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)

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