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Level 4~Investments - Unrealized Losses on AFS Securities (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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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 | $ 13,984 | $ 6,798
Amortized Cost |  |
12 Months or More | 2,026 | 2,040
Total | 16,010 | 8,838
Fair Value |  |
Less Than 12 Months | 13,707 | 6,739
12 Months or More | 1,910 | 1,969
Total | 15,617 | 8,708
Unrealized Losses |  |
Less Than 12 Months | (277) | (59)
12 Months or More | (116) | (71)
Total | (393) | (130)
ABS |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost | 520 | 461
Amortized Cost |  |
12 Months or More | 33 | 30
Total | 553 | 491
Fair Value |  |
Less Than 12 Months | 515 | 460
12 Months or More | 32 | 29
Total | 547 | 489
Unrealized Losses |  |
Less Than 12 Months | (5) | (1)
12 Months or More | (1) | (1)
Total | (6) | (2)
CDOs |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost | 905 | 359
Amortized Cost |  |
12 Months or More | 0 | 1
Total | 905 | 360
Fair Value |  |
Less Than 12 Months | 903 | 359
12 Months or More | 0 | 1
Total | 903 | 360
Unrealized Losses |  |
Less Than 12 Months | (2) | 0
12 Months or More | 0 | 0
Total | (2) | 0
CMBS |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost | 1,701 | 1,178
Amortized Cost |  |
12 Months or More | 242 | 243
Total | 1,943 | 1,421
Fair Value |  |
Less Than 12 Months | 1,662 | 1,167
12 Months or More | 224 | 228
Total | 1,886 | 1,395
Unrealized Losses |  |
Less Than 12 Months | (39) | (11)
12 Months or More | (18) | (15)
Total | (57) | (26)
Corporate |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost | 5,931 | 2,322
Amortized Cost |  |
12 Months or More | 1,066 | 1,064
Total | 6,997 | 3,386
Fair Value |  |
Less Than 12 Months | 5,785 | 2,302
12 Months or More | 1,002 | 1,028
Total | 6,787 | 3,330
Unrealized Losses |  |
Less Than 12 Months | (146) | (20)
12 Months or More | (64) | (36)
Total | (210) | (56)
Foreign government/government agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost | 552 | 244
Amortized Cost |  |
12 Months or More | 51 | 51
Total | 603 | 295
Fair Value |  |
Less Than 12 Months | 539 | 242
12 Months or More | 48 | 49
Total | 587 | 291
Unrealized Losses |  |
Less Than 12 Months | (13) | (2)
12 Months or More | (3) | (2)
Total | (16) | (4)
Municipal |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost | 2,077 | 511
Amortized Cost |  |
12 Months or More | 230 | 236
Total | 2,307 | 747
Fair Value |  |
Less Than 12 Months | 2,044 | 507
12 Months or More | 214 | 228
Total | 2,258 | 735
Unrealized Losses |  |
Less Than 12 Months | (33) | (4)
12 Months or More | (16) | (8)
Total | (49) | (12)
RMBS |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost | 1,448 | 889
Amortized Cost |  |
12 Months or More | 132 | 137
Total | 1,580 | 1,026
Fair Value |  |
Less Than 12 Months | 1,421 | 887
12 Months or More | 127 | 135
Total | 1,548 | 1,022
Unrealized Losses |  |
Less Than 12 Months | (27) | (2)
12 Months or More | (5) | (2)
Total | (32) | (4)
US Treasury Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Amortized Cost | 850 | 658
Amortized Cost |  |
12 Months or More | 272 | 254
Total | 1,122 | 912
Fair Value |  |
Less Than 12 Months | 838 | 652
12 Months or More | 263 | 250
Total | 1,101 | 902
Unrealized Losses |  |
Less Than 12 Months | (12) | (6)
12 Months or More | (9) | (4)
Total | $ (21) | (10)
Fixed maturities |  |
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 |  |
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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