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Fair Value of Assets and Liabilities - Rollforward of Level 3 assets and liabilities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Rollforward of Level 3 assets held at fair value on a recurring basis      
Balance at beginning of period $ 467 $ 514 $ 720
Total gains (losses) included in: net income 14 18 19
Total gains (losses) included in: OCI (6) 9 17
Transfers into Level 3 25 18 49
Transfers out of Level 3 (138) (67) (304)
Purchases 64 84 153
Sales (39) (42) (49)
Issues 0 0 0
Settlements (66) (67) (91)
Balance at end of period 321 467 514
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning of period (284) (289) (299)
Total gains (losses) included in: net income 57 1 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 (2) (2) (3)
Settlements 6 6 7
Balance at end of period (223) (284) (289)
Fair value assets and liabilities measured on recurring basis, gain (loss) included in earnings      
Total realized and unrealized gains (losses) included in net income, recurring Level 3 assets and liabilities 71 19 25
Other investments: Free-standing derivatives 1 1 1
Other liabilities: Free-standing derivatives     3
Realized capital gains and losses      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Total gains (losses) included in: net income 14 9 8
Net investment income      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Total gains (losses) included in: net income   10 11
Interest credited to contractholder funds      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Total gains (losses) included in: net income 62 (9) (3)
Contract benefits      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Total gains (losses) included in: net income (5) 9 9
Municipal      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Balance at beginning of period 57 59 78
Total gains (losses) included in: net income 0 0 12
Total gains (losses) included in: OCI (2) 2 (8)
Transfers into Level 3 0 0 6
Transfers out of Level 3 (16) 0 0
Purchases 2 0 0
Sales (2) (2) (27)
Issues 0 0 0
Settlements 0 (2) (2)
Balance at end of period 39 57 59
Corporate - public      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Balance at beginning of period 49 47 44
Total gains (losses) included in: net income 0 1 0
Total gains (losses) included in: OCI (2) 0 0
Transfers into Level 3 3 3 16
Transfers out of Level 3 (3) (15) (15)
Purchases 0 17 6
Sales (11) 0 (3)
Issues 0 0 0
Settlements (3) (4) (1)
Balance at end of period 33 49 47
Corporate - privately placed      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Balance at beginning of period 220 264 447
Total gains (losses) included in: net income (2) 7 15
Total gains (losses) included in: OCI (2) (2) 18
Transfers into Level 3 10 11 16
Transfers out of Level 3 (101) (16) (277)
Purchases 12 20 108
Sales 0 (30) (15)
Issues 0 0 0
Settlements (40) (34) (48)
Balance at end of period 97 220 264
ABS - CDO      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Balance at beginning of period 10 27 53
Total gains (losses) included in: net income 0 0 1
Total gains (losses) included in: OCI 0 6 5
Transfers into Level 3 0 4 8
Transfers out of Level 3 0 (10) (1)
Purchases 0 5 0
Sales 0 0 (2)
Issues 0 0 0
Settlements (4) (22) (37)
Balance at end of period 6 10 27
ABS - consumer and other      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Balance at beginning of period 40 42 44
Total gains (losses) included in: net income 0 0 0
Total gains (losses) included in: OCI 0 0 (3)
Transfers into Level 3 12 0 3
Transfers out of Level 3 (18) (26) (7)
Purchases 20 29 7
Sales (19) 0 0
Issues 0 0 0
Settlements (19) (5) (2)
Balance at end of period 16 40 42
Fixed income securities      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Balance at beginning of period 376 439 666
Total gains (losses) included in: net income (2) 8 28
Total gains (losses) included in: OCI (6) 6 12
Transfers into Level 3 25 18 49
Transfers out of Level 3 (138) (67) (300)
Purchases 34 71 121
Sales (32) (32) (47)
Issues 0 0 0
Settlements (66) (67) (90)
Balance at end of period 191 376 439
Equity securities      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Balance at beginning of period 90 76 60
Total gains (losses) included in: net income 16 8 (15)
Total gains (losses) included in: OCI 0 3 5
Transfers into Level 3 0 0 0
Transfers out of Level 3 0 0 (4)
Purchases 30 13 32
Sales (7) (10) (2)
Issues 0 0 0
Settlements 0 0 0
Balance at end of period 129 90 76
Free-standing derivatives, net      
Rollforward of Level 3 assets held at fair value on a recurring basis      
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      
Rollforward of Level 3 assets held at fair value on a recurring basis      
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
Contractholder funds: Derivatives embedded in life and annuity contracts      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning of period (284) (289) (299)
Total gains (losses) included in: net income 57 1 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 (2) (2) (3)
Settlements 6 6 7
Balance at end of period $ (223) $ (284) $ (289)