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Investments - Investments - Unrealized Losses on AFS Securities (Details) $ in Millions | Jun. 30, 2018 USD ($) security | Dec. 31, 2017 USD ($)
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost | $ 15,515 | $ 6,798
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 2,855 |
Amortized Cost |  |
12 Months or More | $ 1,981 | 2,040
Total | 17,496 | 8,838
Fair Value |  |
Less Than 12 Months | 15,101 | 6,739
12 Months or More | 1,845 | 1,969
Total | 16,946 | 8,708
Unrealized Losses |  |
Less Than 12 Months | (414) | (59)
12 Months or More | (136) | (71)
Total | $ (550) | (130)
Percentage of Gross Unrealized Losses Depressed Less than Twenty Percent of Cost or Amortized Cost | 98.42382% |
ABS |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost | $ 477 | 461
Amortized Cost |  |
12 Months or More | 32 | 30
Total | 509 | 491
Fair Value |  |
Less Than 12 Months | 475 | 460
12 Months or More | 31 | 29
Total | 506 | 489
Unrealized Losses |  |
Less Than 12 Months | (2) | (1)
12 Months or More | (1) | (1)
Total | (3) | (2)
CDOs |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost | 556 | 359
Amortized Cost |  |
12 Months or More | 0 | 1
Total | 556 | 360
Fair Value |  |
Less Than 12 Months | 553 | 359
12 Months or More | 0 | 1
Total | 553 | 360
Unrealized Losses |  |
Less Than 12 Months | (3) | 0
12 Months or More | 0 | 0
Total | (3) | 0
CMBS |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost | 2,002 | 1,178
Amortized Cost |  |
12 Months or More | 251 | 243
Total | 2,253 | 1,421
Fair Value |  |
Less Than 12 Months | 1,947 | 1,167
12 Months or More | 233 | 228
Total | 2,180 | 1,395
Unrealized Losses |  |
Less Than 12 Months | (55) | (11)
12 Months or More | (18) | (15)
Total | (73) | (26)
Corporate |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost | 7,467 | 2,322
Amortized Cost |  |
12 Months or More | 1,035 | 1,064
Total | 8,502 | 3,386
Fair Value |  |
Less Than 12 Months | 7,213 | 2,302
12 Months or More | 953 | 1,028
Total | 8,166 | 3,330
Unrealized Losses |  |
Less Than 12 Months | (254) | (20)
12 Months or More | (82) | (36)
Total | (336) | (56)
Foreign Govt./Govt. Agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost | 676 | 244
Amortized Cost |  |
12 Months or More | 61 | 51
Total | 737 | 295
Fair Value |  |
Less Than 12 Months | 652 | 242
12 Months or More | 57 | 49
Total | 709 | 291
Unrealized Losses |  |
Less Than 12 Months | (24) | (2)
12 Months or More | (4) | (2)
Total | (28) | (4)
Municipal |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost | 1,845 | 511
Amortized Cost |  |
12 Months or More | 225 | 236
Total | 2,070 | 747
Fair Value |  |
Less Than 12 Months | 1,817 | 507
12 Months or More | 209 | 228
Total | 2,026 | 735
Unrealized Losses |  |
Less Than 12 Months | (28) | (4)
12 Months or More | (16) | (8)
Total | (44) | (12)
RMBS |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost | 1,751 | 889
Amortized Cost |  |
12 Months or More | 137 | 137
Total | 1,888 | 1,026
Fair Value |  |
Less Than 12 Months | 1,716 | 887
12 Months or More | 131 | 135
Total | 1,847 | 1,022
Unrealized Losses |  |
Less Than 12 Months | (35) | (2)
12 Months or More | (6) | (2)
Total | (41) | (4)
U.S. Treasuries |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost | 741 | 658
Amortized Cost |  |
12 Months or More | 240 | 254
Total | 981 | 912
Fair Value |  |
Less Than 12 Months | 728 | 652
12 Months or More | 231 | 250
Total | 959 | 902
Unrealized Losses |  |
Less Than 12 Months | (13) | (6)
12 Months or More | (9) | (4)
Total | $ (22) | (10)
Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [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 |  |
Schedule of Available-for-sale Securities [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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