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Investments - Investments - Unrealized Losses on AFS Securities (Details) $ in Millions | Sep. 30, 2018 USD ($) security | Dec. 31, 2017 USD ($)
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Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost | $ 16,755 | $ 6,798
Amortized Cost |  |
12 Months or More | 3,183 | 2,040
Total | 19,938 | 8,838
Fair Value |  |
Less Than 12 Months | 16,348 | 6,739
12 Months or More | 2,983 | 1,969
Total | 19,331 | 8,708
Unrealized Losses |  |
Less Than 12 Months | (407) | (59)
12 Months or More | (200) | (71)
Total | $ (607) | (130)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 2,926 |
Percentage of Gross Unrealized Losses Depressed Less than Twenty Percent of Cost or Amortized Cost | 98.53042% |
ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost | $ 668 | 461
Amortized Cost |  |
12 Months or More | 74 | 30
Total | 742 | 491
Fair Value |  |
Less Than 12 Months | 666 | 460
12 Months or More | 73 | 29
Total | 739 | 489
Unrealized Losses |  |
Less Than 12 Months | (2) | (1)
12 Months or More | (1) | (1)
Total | (3) | (2)
CLOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost | 929 | 359
Amortized Cost |  |
12 Months or More | 10 | 1
Total | 939 | 360
Fair Value |  |
Less Than 12 Months | 926 | 359
12 Months or More | 10 | 1
Total | 936 | 360
Unrealized Losses |  |
Less Than 12 Months | (3) | 0
12 Months or More | 0 | 0
Total | (3) | 0
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost | 1,995 | 1,178
Amortized Cost |  |
12 Months or More | 740 | 243
Total | 2,735 | 1,421
Fair Value |  |
Less Than 12 Months | 1,952 | 1,167
12 Months or More | 697 | 228
Total | 2,649 | 1,395
Unrealized Losses |  |
Less Than 12 Months | (43) | (11)
12 Months or More | (43) | (15)
Total | (86) | (26)
Corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost | 7,586 | 2,322
Amortized Cost |  |
12 Months or More | 1,412 | 1,064
Total | 8,998 | 3,386
Fair Value |  |
Less Than 12 Months | 7,364 | 2,302
12 Months or More | 1,310 | 1,028
Total | 8,674 | 3,330
Unrealized Losses |  |
Less Than 12 Months | (222) | (20)
12 Months or More | (102) | (36)
Total | (324) | (56)
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 | 552 | 244
Amortized Cost |  |
12 Months or More | 95 | 51
Total | 647 | 295
Fair Value |  |
Less Than 12 Months | 537 | 242
12 Months or More | 90 | 49
Total | 627 | 291
Unrealized Losses |  |
Less Than 12 Months | (15) | (2)
12 Months or More | (5) | (2)
Total | (20) | (4)
Municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost | 2,206 | 511
Amortized Cost |  |
12 Months or More | 266 | 236
Total | 2,472 | 747
Fair Value |  |
Less Than 12 Months | 2,151 | 507
12 Months or More | 245 | 228
Total | 2,396 | 735
Unrealized Losses |  |
Less Than 12 Months | (55) | (4)
12 Months or More | (21) | (8)
Total | (76) | (12)
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost | 1,795 | 889
Amortized Cost |  |
12 Months or More | 184 | 137
Total | 1,979 | 1,026
Fair Value |  |
Less Than 12 Months | 1,751 | 887
12 Months or More | 176 | 135
Total | 1,927 | 1,022
Unrealized Losses |  |
Less Than 12 Months | (44) | (2)
12 Months or More | (8) | (2)
Total | (52) | (4)
U.S. Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost | 1,024 | 658
Amortized Cost |  |
12 Months or More | 402 | 254
Total | 1,426 | 912
Fair Value |  |
Less Than 12 Months | 1,001 | 652
12 Months or More | 382 | 250
Total | 1,383 | 902
Unrealized Losses |  |
Less Than 12 Months | (23) | (6)
12 Months or More | (20) | (4)
Total | $ (43) | (10)
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 |  | 6,622
Amortized Cost |  |
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)
Equity Securities, at fair value |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost |  | 176
Amortized Cost |  |
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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