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Investments - Investments - Unrealized Losses on AFS Securities (Details) $ in Millions | Mar. 31, 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 | 1,682 |
Percentage of Gross Unrealized Losses Depressed Less than Twenty Percent of Cost or Amortized Cost | 98.00% |
ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost | $ 143 | $ 566
Amortized Cost |  |
12 Months or More | 108 | 113
Total | 251 | 679
Fair Value |  |
Less Than 12 Months | 143 | 566
12 Months or More | 107 | 112
Total | 250 | 678
Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or More | (1) | (1)
Total | (1) | (1)
CLOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost | 1,218 | 1,358
Amortized Cost |  |
12 Months or More | 82 | 7
Total | 1,300 | 1,365
Fair Value |  |
Less Than 12 Months | 1,208 | 1,338
12 Months or More | 81 | 7
Total | 1,289 | 1,345
Unrealized Losses |  |
Less Than 12 Months | (10) | (20)
12 Months or More | (1) | 0
Total | (11) | (20)
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost | 83 | 896
Amortized Cost |  |
12 Months or More | 1,391 | 1,129
Total | 1,474 | 2,025
Fair Value |  |
Less Than 12 Months | 82 | 882
12 Months or More | 1,359 | 1,079
Total | 1,441 | 1,961
Unrealized Losses |  |
Less Than 12 Months | (1) | (14)
12 Months or More | (32) | (50)
Total | (33) | (64)
Corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost | 737 | 7,174
Amortized Cost |  |
12 Months or More | 4,175 | 2,541
Total | 4,912 | 9,715
Fair Value |  |
Less Than 12 Months | 722 | 6,903
12 Months or More | 4,057 | 2,366
Total | 4,779 | 9,269
Unrealized Losses |  |
Less Than 12 Months | (15) | (271)
12 Months or More | (118) | (175)
Total | (133) | (446)
Foreign Govt./Govt. Agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost | 35 | 407
Amortized Cost |  |
12 Months or More | 292 | 203
Total | 327 | 610
Fair Value |  |
Less Than 12 Months | 35 | 391
12 Months or More | 285 | 193
Total | 320 | 584
Unrealized Losses |  |
Less Than 12 Months | 0 | (16)
12 Months or More | (7) | (10)
Total | (7) | (26)
Municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost | 8 | 1,643
Amortized Cost |  |
12 Months or More | 285 | 292
Total | 293 | 1,935
Fair Value |  |
Less Than 12 Months | 8 | 1,613
12 Months or More | 278 | 275
Total | 286 | 1,888
Unrealized Losses |  |
Less Than 12 Months | 0 | (30)
12 Months or More | (7) | (17)
Total | (7) | (47)
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost | 237 | 1,344
Amortized Cost |  |
12 Months or More | 985 | 648
Total | 1,222 | 1,992
Fair Value |  |
Less Than 12 Months | 236 | 1,329
12 Months or More | 973 | 628
Total | 1,209 | 1,957
Unrealized Losses |  |
Less Than 12 Months | (1) | (15)
12 Months or More | (12) | (20)
Total | (13) | (35)
U.S. Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost | 153 | 497
Amortized Cost |  |
12 Months or More | 294 | 339
Total | 447 | 836
Fair Value |  |
Less Than 12 Months | 153 | 492
12 Months or More | 290 | 329
Total | 443 | 821
Unrealized Losses |  |
Less Than 12 Months | 0 | (5)
12 Months or More | (4) | (10)
Total | (4) | (15)
Available-for-sale Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost | 2,614 | 13,885
Amortized Cost |  |
12 Months or More | 7,612 | 5,272
Total | 10,226 | 19,157
Fair Value |  |
Less Than 12 Months | 2,587 | 13,514
12 Months or More | 7,430 | 4,989
Total | 10,017 | 18,503
Unrealized Losses |  |
Less Than 12 Months | (27) | (371)
12 Months or More | (182) | (283)
Total | $ (209) | $ (654)

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