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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Assets |  |  |
Balance at beginning of period | $ 697 | $ 837 | $ 735
Total gains (losses) included in: net income | 30 | 37 | 22
Total gains (losses) included in: OCI | 6 | (6) | 15
Transfers into Level 3 | 158 | 79 | 94
Transfers out of Level 3 | (330) | (325) | (369)
Purchases | 375 | 367 | 533
Sales | (173) | (208) | (113)
Issues | 0 | 0 | 0
Settlements | (25) | (84) | (80)
Balance at end of period | 738 | 697 | 837
Liabilities |  |  |
Balance at beginning of period | (224) | (286) | (290)
Total gains (losses) included in: net income | (61) | 58 | 0
Total gains (losses) included in: OCI | 0 | 0 | 0
Transfers into Level 3 | (175) | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0
Purchases | 0 | 0 | 0
Sales | 0 | 0 | 0
Issues | (16) | (2) | (2)
Settlements | 14 | 6 | 6
Balance at end of period | (462) | (224) | (286)
Fair value assets and liabilities measured on recurring basis, gain (loss) included in earnings |  |  |
Gain (loss) included in earnings | (31) | 95 | 22
Assets transferred between Level 1 and Level 2 | 0 | 0 | 0
Liabilities transferred between Level 1 and Level 2 | 0 | 0 | 0
Net investment income |  |  |
Assets |  |  |
Total gains (losses) included in: net income | (2) | 0 | 19
Realized capital gains (losses) |  |  |
Assets |  |  |
Total gains (losses) included in: net income | 32 | 37 | 4
Life and annuity contract benefits |  |  |
Assets |  |  |
Total gains (losses) included in: net income | 7 | (5) | 9
Interest credited to contractholder funds |  |  |
Assets |  |  |
Total gains (losses) included in: net income | (68) | 63 | (10)
Contractholder funds: Derivatives embedded in life and annuity contracts |  |  |
Liabilities |  |  |
Balance at beginning of period | (224) | (286) | (290)
Total gains (losses) included in: net income | (61) | 58 | 0
Total gains (losses) included in: OCI | 0 | 0 | 0
Transfers into Level 3 | (175) | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0
Purchases | 0 | 0 | 0
Sales | 0 | 0 | 0
Issues | (16) | (2) | (2)
Settlements | 14 | 6 | 6
Balance at end of period | (462) | (224) | (286)
Municipal |  |  |
Assets |  |  |
Balance at beginning of period | 70 | 101 | 125
Total gains (losses) included in: net income | 1 | 1 | (1)
Total gains (losses) included in: OCI | 4 | (2) | 7
Transfers into Level 3 | 0 | 0 | 0
Transfers out of Level 3 | (5) | (26) | (6)
Purchases | 0 | 10 | 8
Sales | (5) | (8) | (29)
Issues | 0 | 0 | 0
Settlements | (3) | (6) | (3)
Balance at end of period | 62 | 70 | 101
Corporate - public |  |  |
Assets |  |  |
Balance at beginning of period | 70 | 108 | 78
Total gains (losses) included in: net income | 0 | 0 | 0
Total gains (losses) included in: OCI | 3 | (3) | 0
Transfers into Level 3 | 30 | 17 | 4
Transfers out of Level 3 | (113) | (21) | (30)
Purchases | 86 | 10 | 60
Sales | (11) | (38) | 0
Issues | 0 | 0 | 0
Settlements | (4) | (3) | (4)
Balance at end of period | 61 | 70 | 108
Corporate - privately placed |  |  |
Assets |  |  |
Balance at beginning of period | 90 | 224 | 263
Total gains (losses) included in: net income | (1) | (1) | 8
Total gains (losses) included in: OCI | 2 | (3) | (2)
Transfers into Level 3 | 43 | 20 | 30
Transfers out of Level 3 | (2) | (119) | (49)
Purchases | 4 | 22 | 44
Sales | (13) | (5) | (30)
Issues | 0 | 0 | 0
Settlements | (9) | (48) | (40)
Balance at end of period | 114 | 90 | 224
ABS |  |  |
Assets |  |  |
Balance at beginning of period | 69 | 147 | 69
Total gains (losses) included in: net income | 1 | 0 | 0
Total gains (losses) included in: OCI | (1) | 2 | 6
Transfers into Level 3 | 76 | 42 | 60
Transfers out of Level 3 | (210) | (159) | (280)
Purchases | 159 | 160 | 322
Sales | (22) | (97) | 0
Issues | 0 | 0 | 0
Settlements | (7) | (26) | (30)
Balance at end of period | 65 | 69 | 147
MBS |  |  |
Assets |  |  |
Balance at beginning of period | 26 | 26 | 23
Total gains (losses) included in: net income | 0 | 0 | 0
Total gains (losses) included in: OCI | (2) | 0 | 0
Transfers into Level 3 | 9 | 0 | 0
Transfers out of Level 3 | 0 | 0 | 0
Purchases | 9 | 1 | 6
Sales | 0 | 0 | 0
Issues | 0 | 0 | 0
Settlements | (2) | (1) | (3)
Balance at end of period | 40 | 26 | 26
Fixed income securities |  |  |
Assets |  |  |
Balance at beginning of period | 325 | 606 | 558
Total gains (losses) included in: net income | 1 | 0 | 7
Total gains (losses) included in: OCI | 6 | (6) | 11
Transfers into Level 3 | 158 | 79 | 94
Transfers out of Level 3 | (330) | (325) | (365)
Purchases | 258 | 203 | 440
Sales | (51) | (148) | (59)
Issues | 0 | 0 | 0
Settlements | (25) | (84) | (80)
Balance at end of period | 342 | 325 | 606
Equity securities |  |  |
Assets |  |  |
Balance at beginning of period | 341 | 210 | 163
Total gains (losses) included in: net income | 30 | 37 | 13
Total gains (losses) included in: OCI | 0 | 0 | 4
Transfers into Level 3 | 0 | 0 | 0
Transfers out of Level 3 | 0 | 0 | (4)
Purchases | 82 | 109 | 48
Sales | (82) | (15) | (14)
Issues | 0 | 0 | 0
Settlements | 0 | 0 | 0
Balance at end of period | 371 | 341 | 210
Short-term investments |  |  |
Assets |  |  |
Balance at beginning of period | 30 | 20 | 15
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 | 35 | 55 | 45
Sales | (40) | (45) | (40)
Issues | 0 | 0 | 0
Settlements | 0 | 0 | 0
Balance at end of period | 25 | 30 | 20
Free-standing derivatives, net |  |  |
Assets |  |  |
Balance at beginning of period | 1 | 1 | (2)
Total gains (losses) included in: net income | (1) | 0 | 3
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 | 0
Balance at end of period | $ 0 | 1 | 1
Other assets |  |  |
Assets |  |  |
Balance at beginning of period |  | $ 0 | 1
Total gains (losses) included in: net income |  |  | (1)
Total gains (losses) included in: OCI |  |  | 0
Transfers into Level 3 |  |  | 0
Transfers out of Level 3 |  |  | 0
Purchases |  |  | 0
Sales |  |  | 0
Issues |  |  | 0
Settlements |  |  | 0
Balance at end of period |  |  | $ 0

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