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Investments - Unrealized Losses on AFS Securities (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Amortized Cost |  |
Less Than 12 Months |  | $ 6,798
12 Months or More |  | 2,040
Total |  | 8,838
Fair Value |  |
Less Than 12 Months |  | 6,739
12 Months or More |  | 1,969
Total |  | 8,708
Unrealized Losses |  |
Less Than 12 Months |  | (59)
12 Months or More |  | (71)
Total |  | (130)
ABS |  |
Amortized Cost |  |
Less Than 12 Months | $ 566 | 461
12 Months or More | 113 | 30
Total | 679 | 491
Fair Value |  |
Less Than 12 Months | 566 | 460
12 Months or More | 112 | 29
Total | 678 | 489
Unrealized Losses |  |
Less Than 12 Months | 0 | (1)
12 Months or More | (1) | (1)
Total | (1) | (2)
Collateralized loan obligations (CLOs) |  |
Amortized Cost |  |
Less Than 12 Months | 1,358 | 359
12 Months or More | 7 | 1
Total | 1,365 | 360
Fair Value |  |
Less Than 12 Months | 1,338 | 359
12 Months or More | 7 | 1
Total | 1,345 | 360
Unrealized Losses |  |
Less Than 12 Months | (20) | 0
12 Months or More | 0 | 0
Total | (20) | 0
CMBS |  |
Amortized Cost |  |
Less Than 12 Months | 896 | 1,178
12 Months or More | 1,129 | 243
Total | 2,025 | 1,421
Fair Value |  |
Less Than 12 Months | 882 | 1,167
12 Months or More | 1,079 | 228
Total | 1,961 | 1,395
Unrealized Losses |  |
Less Than 12 Months | (14) | (11)
12 Months or More | (50) | (15)
Total | (64) | (26)
Corporate |  |
Amortized Cost |  |
Less Than 12 Months | 7,174 | 2,322
12 Months or More | 2,541 | 1,064
Total | 9,715 | 3,386
Fair Value |  |
Less Than 12 Months | 6,903 | 2,302
12 Months or More | 2,366 | 1,028
Total | 9,269 | 3,330
Unrealized Losses |  |
Less Than 12 Months | (271) | (20)
12 Months or More | (175) | (36)
Total | (446) | (56)
Foreign government |  |
Amortized Cost |  |
Less Than 12 Months | 407 | 244
12 Months or More | 203 | 51
Total | 610 | 295
Fair Value |  |
Less Than 12 Months | 391 | 242
12 Months or More | 193 | 49
Total | 584 | 291
Unrealized Losses |  |
Less Than 12 Months | (16) | (2)
12 Months or More | (10) | (2)
Total | (26) | (4)
Municipal |  |
Amortized Cost |  |
Less Than 12 Months | 1,643 | 511
12 Months or More | 292 | 236
Total | 1,935 | 747
Fair Value |  |
Less Than 12 Months | 1,613 | 507
12 Months or More | 275 | 228
Total | 1,888 | 735
Unrealized Losses |  |
Less Than 12 Months | (30) | (4)
12 Months or More | (17) | (8)
Total | (47) | (12)
Residential mortgage-backed securities (RMBS) |  |
Amortized Cost |  |
Less Than 12 Months | 1,344 | 889
12 Months or More | 648 | 137
Total | 1,992 | 1,026
Fair Value |  |
Less Than 12 Months | 1,329 | 887
12 Months or More | 628 | 135
Total | 1,957 | 1,022
Unrealized Losses |  |
Less Than 12 Months | (15) | (2)
12 Months or More | (20) | (2)
Total | (35) | (4)
US Treasury Securities |  |
Amortized Cost |  |
Less Than 12 Months | 497 | 658
12 Months or More | 339 | 254
Total | 836 | 912
Fair Value |  |
Less Than 12 Months | 492 | 652
12 Months or More | 329 | 250
Total | 821 | 902
Unrealized Losses |  |
Less Than 12 Months | (5) | (6)
12 Months or More | (10) | (4)
Total | (15) | (10)
Securities available-for-sale and other |  |
Amortized Cost |  |
Less Than 12 Months |  | 6,622
12 Months or More |  | 2,016
Total |  | 8,638
Fair Value |  |
Less Than 12 Months |  | 6,576
12 Months or More |  | 1,948
Total |  | 8,524
Unrealized Losses |  |
Less Than 12 Months |  | (46)
12 Months or More |  | (68)
Total |  | (114)
Fixed maturities |  |
Amortized Cost |  |
Less Than 12 Months | 13,885 |
12 Months or More | 5,272 |
Total | 19,157 |
Fair Value |  |
Less Than 12 Months | 13,514 |
12 Months or More | 4,989 |
Total | 18,503 |
Unrealized Losses |  |
Less Than 12 Months | (371) |
12 Months or More | (283) |
Total | $ (654) |
Equity Securities [Member] |  |
Amortized Cost |  |
Less Than 12 Months |  | 176
12 Months or More |  | 24
Total |  | 200
Fair Value |  |
Less Than 12 Months |  | 163
12 Months or More |  | 21
Total |  | 184
Unrealized Losses |  |
Less Than 12 Months |  | (13)
12 Months or More |  | (3)
Total |  | $ (16)

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