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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Rollforward of Level 3 assets held at fair value on a recurring basis      
Balance at beginning of period $ 324 $ 321 $ 467
Total gains (losses) included in: net income 1 14 14
Total gains (losses) included in: OCI (7) 3 (6)
Transfers into Level 3 52 54 25
Transfers out of Level 3 (43) (69) (138)
Purchases 24 82 64
Sales (77) (60) (39)
Issues 0 0 0
Settlements (7) (21) (66)
Balance at end of period 267 324 321
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning of period (427) (223) (284)
Total gains (losses) included in: net income (24) (52) 57
Total gains (losses) included in: OCI 0 0 0
Transfers into Level 3 (54) (154) 0
Transfers out of Level 3 0 0 0
Purchases 0 0 0
Sales 0 0 0
Issues (34) (10) (2)
Settlements 23 12 6
Balance at end of period (516) (427) (223)
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 (23) (38) 71
Other investments: Free-standing derivatives     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 (427) (223) (284)
Total gains (losses) included in: net income (24) (52) 57
Total gains (losses) included in: OCI 0 0 0
Transfers into Level 3 (54) (154) 0
Transfers out of Level 3 0 0 0
Purchases 0 0 0
Sales 0 0 0
Issues (34) (10) (2)
Settlements 23 12 6
Balance at end of period (516) (427) (223)
Net investment income      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Total gains (losses) included in: net income (8) (2) 0
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 9 16 14
Contract benefits      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Total gains (losses) included in: net income (1) 7 (5)
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 (23) (59) 62
Municipal      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Balance at beginning of period 40 39 57
Total gains (losses) included in: net income 1 0 0
Total gains (losses) included in: OCI 2 4 (2)
Transfers into Level 3 20 0 0
Transfers out of Level 3 (11) 0 (16)
Purchases 0 0 2
Sales (1) (1) (2)
Issues 0 0 0
Settlements (2) (2) 0
Balance at end of period 49 40 39
Corporate - public      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Balance at beginning of period 25 33 49
Total gains (losses) included in: net income 0 0 0
Total gains (losses) included in: OCI 0 0 (2)
Transfers into Level 3 0 5 3
Transfers out of Level 3 0 (38) (3)
Purchases 7 32 0
Sales 0 (2) (11)
Issues 0 0 0
Settlements (1) (5) (3)
Balance at end of period 31 25 33
Corporate - privately placed      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Balance at beginning of period 122 97 220
Total gains (losses) included in: net income 2 (1) (2)
Total gains (losses) included in: OCI (7) 1 (2)
Transfers into Level 3 32 43 10
Transfers out of Level 3 (32) (1) (101)
Purchases 8 4 12
Sales (55) (13) 0
Issues 0 0 0
Settlements (2) (8) (40)
Balance at end of period 68 122 97
ABS      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Balance at beginning of period 16 22 50
Total gains (losses) included in: net income 0 1 0
Total gains (losses) included in: OCI 0 (1) 0
Transfers into Level 3 0 0 12
Transfers out of Level 3 0 (30) (18)
Purchases 0 36 20
Sales (10) (6) (19)
Issues 0 0 0
Settlements (1) (6) (23)
Balance at end of period 5 16 22
MBS      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Balance at beginning of period 5 0  
Total gains (losses) included in: net income 1 0  
Total gains (losses) included in: OCI (2) (1)  
Transfers into Level 3 0 6  
Transfers out of Level 3 0 0  
Purchases 0 0  
Sales (3) 0  
Issues 0 0  
Settlements (1) 0  
Balance at end of period 0 5 0
Fixed income securities      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Balance at beginning of period 208 191 376
Total gains (losses) included in: net income 4 0 (2)
Total gains (losses) included in: OCI (7) 3 (6)
Transfers into Level 3 52 54 25
Transfers out of Level 3 (43) (69) (138)
Purchases 15 72 34
Sales (69) (22) (32)
Issues 0 0 0
Settlements (7) (21) (66)
Balance at end of period 153 208 191
Equity securities      
Rollforward of Level 3 assets held at fair value on a recurring basis      
Balance at beginning of period 116 129 90
Total gains (losses) included in: net income (3) 15 16
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 9 10 30
Sales (8) (38) (7)
Issues 0 0 0
Settlements 0 0 0
Balance at end of period 114 116 129
Free-standing derivatives, net      
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 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 0 0
Issues 0 0 0
Settlements 0 0 0
Balance at end of period $ 0 $ 0 $ 1