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Fair Value of Assets and Liabilities - Rollforward of level 3 assets and liabilities held at fair value (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Assets |  |  |
Balance at beginning of period | $ 837 | $ 735 | $ 973
Total gains (losses) included in: net income | 37 | 22 | 3
Total gains (losses) included in: OCI | (6) | 15 | 23
Transfers into Level 3 | 79 | 94 | 76
Transfers out of Level 3 | (325) | (369) | (559)
Purchases | 367 | 533 | 410
Sales | (208) | (113) | (79)
Issues | 0 | 0 | 0
Settlements | (84) | (80) | (112)
Balance at end of period | 697 | 837 | 735
Liabilities |  |  |
Balance at beginning of period | (286) | (290) | (299)
Total gains (losses) included in: net income | (58) | 0 | (5)
Total gains (losses) included in: OCI | 0 | 0 | 0
Transfers into Level 3 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0
Purchases | 0 | 0 | 0
Sales | 0 | 0 | 0
Issues | (2) | (2) | (3)
Settlements | 6 | 6 | 7
Balance at end of period | (224) | (286) | (290)
Fair value assets and liabilities measured on recurring basis, gain (loss) included in earnings |  |  |
Gain (loss) included in earnings | 95 | 22 | 8
Free-standing derivatives, assets | 1 | 1 | 1
Free-standing derivatives, liabilities |  |  | 3
Assets transferred between Level 1 and Level 2 | 0 | 0 | 0
Liabilities transferred between Level 1 and Level 2 | 0 | 0 | 0
Realized capital gains (losses) |  |  |
Assets |  |  |
Total gains (losses) included in: net income | 37 | 4 | (9)
Net investment income |  |  |
Assets |  |  |
Total gains (losses) included in: net income |  | 19 | 12
Interest credited to contractholder funds |  |  |
Assets |  |  |
Total gains (losses) included in: net income | 63 | (10) | (4)
Life and annuity contract benefits |  |  |
Assets |  |  |
Total gains (losses) included in: net income | (5) | 9 | 9
Contractholder funds: Derivatives embedded in life and annuity contracts |  |  |
Liabilities |  |  |
Balance at beginning of period | (286) | (290) | (299)
Total gains (losses) included in: net income | (58) | 0 | (5)
Total gains (losses) included in: OCI | 0 | 0 | 0
Transfers into Level 3 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0
Purchases | 0 | 0 | 0
Sales | 0 | 0 | 0
Issues | (2) | (2) | (3)
Settlements | 6 | 6 | 7
Balance at end of period | (224) | (286) | (290)
U.S. government and agencies |  |  |
Assets |  |  |
Balance at beginning of period |  | 0 | 5
Total gains (losses) included in: net income |  |  | 0
Total gains (losses) included in: OCI |  |  | 0
Transfers into Level 3 |  |  | 0
Transfers out of Level 3 |  |  | (4)
Purchases |  |  | 0
Sales |  |  | 0
Issues |  |  | 0
Settlements |  |  | (1)
Balance at end of period |  |  | 0
Municipal |  |  |
Assets |  |  |
Balance at beginning of period | 101 | 125 | 161
Total gains (losses) included in: net income | 1 | (1) | 12
Total gains (losses) included in: OCI | (2) | 7 | (10)
Transfers into Level 3 | 0 | 0 | 6
Transfers out of Level 3 | (26) | (6) | (23)
Purchases | 10 | 8 | 22
Sales | (8) | (29) | (40)
Issues | 0 | 0 | 0
Settlements | (6) | (3) | (3)
Balance at end of period | 70 | 101 | 125
Corporate - public |  |  |
Assets |  |  |
Balance at beginning of period | 108 | 78 | 46
Total gains (losses) included in: net income | 0 | 0 | 0
Total gains (losses) included in: OCI | (3) | 0 | 0
Transfers into Level 3 | 17 | 4 | 41
Transfers out of Level 3 | (21) | (30) | (43)
Purchases | 10 | 60 | 47
Sales | (38) | 0 | (11)
Issues | 0 | 0 | 0
Settlements | (3) | (4) | (2)
Balance at end of period | 70 | 108 | 78
Corporate - privately placed |  |  |
Assets |  |  |
Balance at beginning of period | 224 | 263 | 502
Total gains (losses) included in: net income | (1) | 8 | 15
Total gains (losses) included in: OCI | (3) | (2) | 18
Transfers into Level 3 | 20 | 30 | 16
Transfers out of Level 3 | (119) | (49) | (398)
Purchases | 22 | 44 | 181
Sales | (5) | (30) | (15)
Issues | 0 | 0 | 0
Settlements | (48) | (40) | (56)
Balance at end of period | 90 | 224 | 263
ABS - CDO |  |  |
Assets |  |  |
Balance at beginning of period | 99 | 27 | 61
Total gains (losses) included in: net income | 0 | 0 | 1
Total gains (losses) included in: OCI | 1 | 6 | 6
Transfers into Level 3 | 20 | 60 | 10
Transfers out of Level 3 | (109) | (190) | (43)
Purchases | 0 | 219 | 40
Sales | 0 | 0 | (3)
Issues | 0 | 0 | 0
Settlements | (5) | (23) | (45)
Balance at end of period | 6 | 99 | 27
ABS - consumer and other |  |  |
Assets |  |  |
Balance at beginning of period | 48 | 42 | 50
Total gains (losses) included in: net income | 0 | 0 | 0
Total gains (losses) included in: OCI | 1 | 0 | (3)
Transfers into Level 3 | 22 | 0 | 3
Transfers out of Level 3 | (50) | (90) | (35)
Purchases | 160 | 103 | 35
Sales | (97) | 0 | (5)
Issues | 0 | 0 | 0
Settlements | (21) | (7) | (3)
Balance at end of period | 63 | 48 | 42
RMBS |  |  |
Assets |  |  |
Balance at beginning of period | 0 | 1 | 1
Total gains (losses) included in: net income |  | 0 | 1
Total gains (losses) included in: OCI |  | 0 | 0
Transfers into Level 3 |  | 0 | 0
Transfers out of Level 3 |  | 0 | 0
Purchases |  | 0 | 0
Sales |  | 0 | (1)
Issues |  | 0 | 0
Settlements |  | (1) | 0
Balance at end of period |  | 0 | 1
CMBS |  |  |
Assets |  |  |
Balance at beginning of period | 26 | 22 | 20
Total gains (losses) included in: net income | 0 | 0 | 0
Total gains (losses) included in: OCI | 0 | 0 | 0
Transfers into Level 3 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | (1)
Purchases | 1 | 6 | 5
Sales | 0 | 0 | 0
Issues | 0 | 0 | 0
Settlements | (1) | (2) | (2)
Balance at end of period | 26 | 26 | 22
Fixed income securities |  |  |
Assets |  |  |
Balance at beginning of period | 606 | 558 | 846
Total gains (losses) included in: net income | 0 | 7 | 29
Total gains (losses) included in: OCI | (6) | 11 | 11
Transfers into Level 3 | 79 | 94 | 76
Transfers out of Level 3 | (325) | (365) | (547)
Purchases | 203 | 440 | 330
Sales | (148) | (59) | (75)
Issues | 0 | 0 | 0
Settlements | (84) | (80) | (112)
Balance at end of period | 325 | 606 | 558
Equity securities |  |  |
Assets |  |  |
Balance at beginning of period | 210 | 163 | 133
Total gains (losses) included in: net income | 37 | 13 | (32)
Total gains (losses) included in: OCI | 0 | 4 | 12
Transfers into Level 3 | 0 | 0 | 0
Transfers out of Level 3 | 0 | (4) | (12)
Purchases | 109 | 48 | 65
Sales | (15) | (14) | (4)
Issues | 0 | 0 | 0
Settlements | 0 | 0 | 1
Balance at end of period | 341 | 210 | 163
Short-term investments |  |  |
Assets |  |  |
Balance at beginning of period | 20 | 15 | 0
Total gains (losses) included in: net income | 0 | 0 | 0
Total gains (losses) included in: OCI | 0 | 0 | 0
Transfers into Level 3 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0
Purchases | 55 | 45 | 15
Sales | (45) | (40) | 0
Issues | 0 | 0 | 0
Settlements | 0 | 0 | 0
Balance at end of period | 30 | 20 | 15
Free-standing derivatives, net |  |  |
Assets |  |  |
Balance at beginning of period | 1 | (2) | (7)
Total gains (losses) included in: net income | 0 | 3 | 6
Total gains (losses) included in: OCI | 0 | 0 | 0
Transfers into Level 3 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0
Purchases | 0 | 0 | 0
Sales | 0 | 0 | 0
Issues | 0 | 0 | 0
Settlements | 0 | 0 | (1)
Balance at end of period | 1 | 1 | (2)
Other assets |  |  |
Assets |  |  |
Balance at beginning of period | $ 0 | 1 | 1
Total gains (losses) included in: net income |  | (1) | 0
Total gains (losses) included in: OCI |  | 0 | 0
Transfers into Level 3 |  | 0 | 0
Transfers out of Level 3 |  | 0 | 0
Purchases |  | 0 | 0
Sales |  | 0 | 0
Issues |  | 0 | 0
Settlements |  | 0 | 0
Balance at end of period |  | $ 0 | $ 1

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