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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Assets |  |  |
Balance at beginning of period | $ 735 | $ 973 | $ 1,469
Total gains (losses) included in: net income | 22 | 3 | 5
Total gains (losses) included in: OCI | 15 | 23 | (28)
Transfers into Level 3 | 94 | 76 | 59
Transfers out of Level 3 | (369) | (559) | (433)
Purchases | 533 | 410 | 276
Sales | (113) | (79) | (223)
Issues | 0 | 0 | 0
Settlements | (80) | (112) | (152)
Balance at end of period | 837 | 735 | 973
Liabilities |  |  |
Balance at beginning of period | (290) | (299) | (323)
Total gains (losses) included in: net income | 0 | (5) | (19)
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) | (3) | (2)
Settlements | 6 | 7 | 7
Balance at end of period | (286) | (290) | (299)
Fair value assets and liabilities measured on recurring basis, gain (loss) included in earnings |  |  |
Gain (loss) included in earnings | 22 | 8 | 24
Other investments: Free-standing derivatives | 1 | 1 | 1
Free-standing derivatives, liabilities |  | 3 | 8
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 and losses |  |  |
Assets |  |  |
Total gains (losses) included in: net income | 4 | (9) | (8)
Net investment income |  |  |
Assets |  |  |
Total gains (losses) included in: net income | 19 | 12 | 13
Interest credited to contractholder funds |  |  |
Assets |  |  |
Total gains (losses) included in: net income | (10) | (4) | 26
Life and annuity contract benefits |  |  |
Assets |  |  |
Total gains (losses) included in: net income | 9 | 9 | (7)
Contractholder funds: Derivatives embedded in life and annuity contracts |  |  |
Liabilities |  |  |
Balance at beginning of period | (290) | (299) | (323)
Total gains (losses) included in: net income | 0 | (5) | (19)
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) | (3) | (2)
Settlements | 6 | 7 | 7
Balance at end of period | (286) | (290) | (299)
U.S. government and agencies |  |  |
Assets |  |  |
Balance at beginning of period | 0 | 5 | 6
Total gains (losses) included in: net income |  | 0 | 0
Total gains (losses) included in: OCI |  | 0 | 0
Transfers into Level 3 |  | 0 | 0
Transfers out of Level 3 |  | (4) | 0
Purchases |  | 0 | 0
Sales |  | 0 | 0
Issues |  | 0 | 0
Settlements |  | (1) | (1)
Balance at end of period |  | 0 | 5
Municipal |  |  |
Assets |  |  |
Balance at beginning of period | 125 | 161 | 270
Total gains (losses) included in: net income | (1) | 12 | (4)
Total gains (losses) included in: OCI | 7 | (10) | (7)
Transfers into Level 3 | 0 | 6 | 3
Transfers out of Level 3 | (6) | (23) | (2)
Purchases | 8 | 22 | 0
Sales | (29) | (40) | (91)
Issues | 0 | 0 | 0
Settlements | (3) | (3) | (8)
Balance at end of period | 101 | 125 | 161
Corporate - public |  |  |
Assets |  |  |
Balance at beginning of period | 78 | 46 | 214
Total gains (losses) included in: net income | 0 | 0 | 0
Total gains (losses) included in: OCI | 0 | 0 | 0
Transfers into Level 3 | 4 | 41 | 0
Transfers out of Level 3 | (30) | (43) | (175)
Purchases | 60 | 47 | 11
Sales | 0 | (11) | 0
Issues | 0 | 0 | 0
Settlements | (4) | (2) | (4)
Balance at end of period | 108 | 78 | 46
Corporate - privately placed |  |  |
Assets |  |  |
Balance at beginning of period | 263 | 502 | 677
Total gains (losses) included in: net income | 8 | 15 | 13
Total gains (losses) included in: OCI | (2) | 18 | (20)
Transfers into Level 3 | 30 | 16 | 13
Transfers out of Level 3 | (49) | (398) | (106)
Purchases | 44 | 181 | 79
Sales | (30) | (15) | (74)
Issues | 0 | 0 | 0
Settlements | (40) | (56) | (80)
Balance at end of period | 224 | 263 | 502
ABS - CDO |  |  |
Assets |  |  |
Balance at beginning of period | 27 | 61 | 104
Total gains (losses) included in: net income | 0 | 1 | (1)
Total gains (losses) included in: OCI | 6 | 6 | 4
Transfers into Level 3 | 60 | 10 | 43
Transfers out of Level 3 | (190) | (43) | (52)
Purchases | 219 | 40 | 0
Sales | 0 | (3) | (2)
Issues | 0 | 0 | 0
Settlements | (23) | (45) | (35)
Balance at end of period | 99 | 27 | 61
ABS - consumer and other |  |  |
Assets |  |  |
Balance at beginning of period | 42 | 50 | 92
Total gains (losses) included in: net income | 0 | 0 | (1)
Total gains (losses) included in: OCI | 0 | (3) | 0
Transfers into Level 3 | 0 | 3 | 0
Transfers out of Level 3 | (90) | (35) | (98)
Purchases | 103 | 35 | 70
Sales | 0 | (5) | (5)
Issues | 0 | 0 | 0
Settlements | (7) | (3) | (8)
Balance at end of period | 48 | 42 | 50
RMBS |  |  |
Assets |  |  |
Balance at beginning of period | 1 | 1 | 1
Total gains (losses) included in: net income | 0 | 1 | 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 | 0 | 0 | 0
Sales | 0 | (1) | 0
Issues | 0 | 0 | 0
Settlements | (1) | 0 | 0
Balance at end of period | 0 | 1 | 1
CMBS |  |  |
Assets |  |  |
Balance at beginning of period | 22 | 20 | 23
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 | (1) | 0
Purchases | 6 | 5 | 12
Sales | 0 | 0 | 0
Issues | 0 | 0 | 0
Settlements | (2) | (2) | (15)
Balance at end of period | 26 | 22 | 20
Fixed income securities |  |  |
Assets |  |  |
Balance at beginning of period | 558 | 846 | 1,387
Total gains (losses) included in: net income | 7 | 29 | 7
Total gains (losses) included in: OCI | 11 | 11 | (23)
Transfers into Level 3 | 94 | 76 | 59
Transfers out of Level 3 | (365) | (547) | (433)
Purchases | 440 | 330 | 172
Sales | (59) | (75) | (172)
Issues | 0 | 0 | 0
Settlements | (80) | (112) | (151)
Balance at end of period | 606 | 558 | 846
Equity securities |  |  |
Assets |  |  |
Balance at beginning of period | 163 | 133 | 83
Total gains (losses) included in: net income | 13 | (32) | (3)
Total gains (losses) included in: OCI | 4 | 12 | (5)
Transfers into Level 3 | 0 | 0 | 0
Transfers out of Level 3 | (4) | (12) | 0
Purchases | 48 | 65 | 69
Sales | (14) | (4) | (11)
Issues | 0 | 0 | 0
Settlements | 0 | 1 | 0
Balance at end of period | 210 | 163 | 133
Short-term investments |  |  |
Assets |  |  |
Balance at beginning of period | 15 | 0 | 5
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 | 45 | 15 | 35
Sales | (40) | 0 | (40)
Issues | 0 | 0 | 0
Settlements | 0 | 0 | 0
Balance at end of period | 20 | 15 | 0
Free-standing derivatives, net |  |  |
Assets |  |  |
Balance at beginning of period | (2) | (7) | (7)
Total gains (losses) included in: net income | 3 | 6 | 1
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 | (1) | (1)
Balance at end of period | 1 | (2) | (7)
Other assets |  |  |
Assets |  |  |
Balance at beginning of period | 1 | 1 | 1
Total gains (losses) included in: net income | (1) | 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 | 0 | 0 | 0
Sales | 0 | 0 | 0
Issues | 0 | 0 | 0
Settlements | 0 | 0 | 0
Balance at end of period | $ 0 | $ 1 | $ 1

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