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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Rollforward of Level 3 assets held at fair value on a recurring basis      
Balance at beginning of period $ 321 $ 467 $ 514
Total gains (losses) included in: net income 14 14 18
Total gains (losses) included in: OCI 3 (6) 9
Transfers into Level 3 54 25 18
Transfers out of Level 3 (69) (138) (67)
Purchases 82 64 84
Sales (60) (39) (42)
Issues 0 0 0
Settlements (21) (66) (67)
Balance at end of period 324 321 467
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning of period (223) (284) (289)
Total gains (losses) included in: net income (52) 57 1
Total gains (losses) included in: OCI 0 0 0
Transfers into Level 3 (154) 0 0
Transfers out of Level 3 0 0 0
Purchases 0 0 0
Sales 0 0 0
Issues (10) (2) (2)
Settlements 12 6 6
Balance at end of period (427) (223) (284)
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 (38) 71 19
Other investments: Free-standing derivatives   1 1
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 16 14 9
Net investment income      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Total gains (losses) included in: net income (2) 0 10
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 (59) 62 (9)
Contract benefits      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Total gains (losses) included in: net income 7 (5) 9
Municipal      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Balance at beginning of period 39 57 59
Total gains (losses) included in: net income 0 0 0
Total gains (losses) included in: OCI 4 (2) 2
Transfers into Level 3 0 0 0
Transfers out of Level 3 0 (16) 0
Purchases 0 2 0
Sales (1) (2) (2)
Issues 0 0 0
Settlements (2) 0 (2)
Balance at end of period 40 39 57
Corporate - public      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Balance at beginning of period 33 49 47
Total gains (losses) included in: net income 0 0 1
Total gains (losses) included in: OCI 0 (2) 0
Transfers into Level 3 5 3 3
Transfers out of Level 3 (38) (3) (15)
Purchases 32 0 17
Sales (2) (11) 0
Issues 0 0 0
Settlements (5) (3) (4)
Balance at end of period 25 33 49
Corporate - privately placed      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Balance at beginning of period 97 220 264
Total gains (losses) included in: net income (1) (2) 7
Total gains (losses) included in: OCI 1 (2) (2)
Transfers into Level 3 43 10 11
Transfers out of Level 3 (1) (101) (16)
Purchases 4 12 20
Sales (13) 0 (30)
Issues 0 0 0
Settlements (8) (40) (34)
Balance at end of period 122 97 220
Asset-backed securities      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Balance at beginning of period 22 50 69
Total gains (losses) included in: net income 1 0 0
Total gains (losses) included in: OCI (1) 0 6
Transfers into Level 3 0 12 4
Transfers out of Level 3 (30) (18) (36)
Purchases 36 20 34
Sales (6) (19) 0
Issues 0 0 0
Settlements (6) (23) (27)
Balance at end of period 16 22 50
MBS      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Balance at beginning of period 0    
Total gains (losses) included in: net income 0    
Total gains (losses) included in: OCI (1)    
Transfers into Level 3 6    
Transfers out of Level 3 0    
Purchases 0    
Sales 0    
Issues 0    
Settlements 0    
Balance at end of period 5 0  
Fixed income securities      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Balance at beginning of period 191 376 439
Total gains (losses) included in: net income 0 (2) 8
Total gains (losses) included in: OCI 3 (6) 6
Transfers into Level 3 54 25 18
Transfers out of Level 3 (69) (138) (67)
Purchases 72 34 71
Sales (22) (32) (32)
Issues 0 0 0
Settlements (21) (66) (67)
Balance at end of period 208 191 376
Equity securities      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Balance at beginning of period 129 90 76
Total gains (losses) included in: net income 15 16 8
Total gains (losses) included in: OCI 0 0 3
Transfers into Level 3 0 0 0
Transfers out of Level 3 0 0 0
Purchases 10 30 13
Sales (38) (7) (10)
Issues 0 0 0
Settlements 0 0 0
Balance at end of period 116 129 90
Free-standing derivatives, net      
Rollforward of Level 3 assets held at fair value on a recurring basis      
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      
Rollforward of Level 3 assets held at fair value on a recurring basis      
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
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 (223) (284) (289)
Total gains (losses) included in: net income (52) 57 1
Total gains (losses) included in: OCI 0 0 0
Transfers into Level 3 (154) 0 0
Transfers out of Level 3 0 0 0
Purchases 0 0 0
Sales 0 0 0
Issues (10) (2) (2)
Settlements 12 6 6
Balance at end of period $ (427) $ (223) $ (284)