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Investments - Investments - Unrealized Losses on AFS Securities (Details) $ in Millions | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
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Unrealized Losses |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 906 |
Percentage of Gross Unrealized Losses Depressed Less than Twenty Percent of Cost or Amortized Cost | 96.00% |
ABS |  |
Amortized Cost |  |
Less Than 12 Months | $ 90 | $ 566
12 Months or More | 29 | 113
Total | 119 | 679
Fair Value |  |
Less Than 12 Months | 90 | 566
12 Months or More | 29 | 112
Total | 119 | 678
Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or More | 0 | (1)
Total | 0 | (1)
CLOs |  |
Amortized Cost |  |
Less Than 12 Months | 1,229 | 1,358
12 Months or More | 155 | 7
Total | 1,384 | 1,365
Fair Value |  |
Less Than 12 Months | 1,223 | 1,338
12 Months or More | 153 | 7
Total | 1,376 | 1,345
Unrealized Losses |  |
Less Than 12 Months | (6) | (20)
12 Months or More | (2) | 0
Total | (8) | (20)
CMBS |  |
Amortized Cost |  |
Less Than 12 Months | 49 | 896
12 Months or More | 372 | 1,129
Total | 421 | 2,025
Fair Value |  |
Less Than 12 Months | 48 | 882
12 Months or More | 365 | 1,079
Total | 413 | 1,961
Unrealized Losses |  |
Less Than 12 Months | (1) | (14)
12 Months or More | (7) | (50)
Total | (8) | (64)
Corporate |  |
Amortized Cost |  |
Less Than 12 Months | 315 | 7,174
12 Months or More | 1,504 | 2,541
Total | 1,819 | 9,715
Fair Value |  |
Less Than 12 Months | 309 | 6,903
12 Months or More | 1,462 | 2,366
Total | 1,771 | 9,269
Unrealized Losses |  |
Less Than 12 Months | (6) | (271)
12 Months or More | (42) | (175)
Total | (48) | (446)
Foreign Govt./Govt. Agencies |  |
Amortized Cost |  |
Less Than 12 Months | 23 | 407
12 Months or More | 62 | 203
Total | 85 | 610
Fair Value |  |
Less Than 12 Months | 23 | 391
12 Months or More | 61 | 193
Total | 84 | 584
Unrealized Losses |  |
Less Than 12 Months | 0 | (16)
12 Months or More | (1) | (10)
Total | (1) | (26)
Municipal |  |
Amortized Cost |  |
Less Than 12 Months | 36 | 1,643
12 Months or More | 7 | 292
Total | 43 | 1,935
Fair Value |  |
Less Than 12 Months | 36 | 1,613
12 Months or More | 7 | 275
Total | 43 | 1,888
Unrealized Losses |  |
Less Than 12 Months | 0 | (30)
12 Months or More | 0 | (17)
Total | 0 | (47)
RMBS |  |
Amortized Cost |  |
Less Than 12 Months | 90 | 1,344
12 Months or More | 356 | 648
Total | 446 | 1,992
Fair Value |  |
Less Than 12 Months | 90 | 1,329
12 Months or More | 354 | 628
Total | 444 | 1,957
Unrealized Losses |  |
Less Than 12 Months | 0 | (15)
12 Months or More | (2) | (20)
Total | (2) | (35)
U.S. Treasuries |  |
Amortized Cost |  |
Less Than 12 Months | 16 | 497
12 Months or More | 163 | 339
Total | 179 | 836
Fair Value |  |
Less Than 12 Months | 16 | 492
12 Months or More | 162 | 329
Total | 178 | 821
Unrealized Losses |  |
Less Than 12 Months | 0 | (5)
12 Months or More | (1) | (10)
Total | (1) | (15)
Available-for-sale Securities [Member] |  |
Amortized Cost |  |
Less Than 12 Months | 1,848 | 13,885
12 Months or More | 2,648 | 5,272
Total | 4,496 | 19,157
Fair Value |  |
Less Than 12 Months | 1,835 | 13,514
12 Months or More | 2,593 | 4,989
Total | 4,428 | 18,503
Unrealized Losses |  |
Less Than 12 Months | (13) | (371)
12 Months or More | (55) | (283)
Total | $ (68) | $ (654)

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