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Investments - Available for sale fixed maturities (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available for sale, amortized cost $ 9,059 $ 8,812      
Fixed maturities, available for sale, allowance for expected credit losses 10 12 $ 14   $ 0
Available for sale (AFS) fixed maturities 9,289 9,084      
Total fixed maturities          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available for sale, amortized cost 9,059 8,812      
Fixed maturities, available for sale, allowance for expected credit losses 10 12      
Fixed maturities, Available for sale, Gross Unrealized, Gains 256 305      
Fixed maturities, Available for sale, Gross Unrealized, Losses (16) (21)      
Available for sale (AFS) fixed maturities 9,289 9,084      
Total fixed maturities | Assets of discontinued annuity operations | Annuity subsidiaries          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available for sale, amortized cost 32,853 31,596      
Fixed maturities, available for sale, allowance for expected credit losses 18 28      
Fixed maturities, Available for sale, Gross Unrealized, Gains 2,023 2,652      
Fixed maturities, Available for sale, Gross Unrealized, Losses (104) (97)      
Available for sale (AFS) fixed maturities 34,754 34,123      
Total fixed maturities | Debt Securities          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax 240 284      
Total fixed maturities | Debt Securities | Assets of discontinued annuity operations | Annuity subsidiaries          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax 1,919 2,555      
U.S. Government and government agencies          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available for sale, amortized cost 212 192      
Fixed maturities, available for sale, allowance for expected credit losses 0 0      
Fixed maturities, Available for sale, Gross Unrealized, Gains 4 6      
Fixed maturities, Available for sale, Gross Unrealized, Losses (1) 0      
Available for sale (AFS) fixed maturities 215 198      
U.S. Government and government agencies | Assets of discontinued annuity operations | Annuity subsidiaries          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available for sale, amortized cost 38 39      
Fixed maturities, available for sale, allowance for expected credit losses 0 0      
Fixed maturities, Available for sale, Gross Unrealized, Gains 4 5      
Fixed maturities, Available for sale, Gross Unrealized, Losses 0 0      
Available for sale (AFS) fixed maturities 42 44      
U.S. Government and government agencies | Debt Securities          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax 3 6      
U.S. Government and government agencies | Debt Securities | Assets of discontinued annuity operations | Annuity subsidiaries          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax 4 5      
States, municipalities and political subdivisions          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available for sale, amortized cost 2,076 2,196      
Fixed maturities, available for sale, allowance for expected credit losses 0 0      
Fixed maturities, Available for sale, Gross Unrealized, Gains 91 116      
Fixed maturities, Available for sale, Gross Unrealized, Losses 0 0      
Available for sale (AFS) fixed maturities 2,167 2,312      
States, municipalities and political subdivisions | Assets of discontinued annuity operations | Annuity subsidiaries          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available for sale, amortized cost 2,951 3,053      
Fixed maturities, available for sale, allowance for expected credit losses 0 0      
Fixed maturities, Available for sale, Gross Unrealized, Gains 269 370      
Fixed maturities, Available for sale, Gross Unrealized, Losses (4) (2)      
Available for sale (AFS) fixed maturities 3,216 3,421      
States, municipalities and political subdivisions | Debt Securities          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax 91 116      
States, municipalities and political subdivisions | Debt Securities | Assets of discontinued annuity operations | Annuity subsidiaries          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax 265 368      
Foreign government          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available for sale, amortized cost 188 172      
Fixed maturities, available for sale, allowance for expected credit losses 0 0      
Fixed maturities, Available for sale, Gross Unrealized, Gains 2 4      
Fixed maturities, Available for sale, Gross Unrealized, Losses 0 0      
Available for sale (AFS) fixed maturities 190 176      
Foreign government | Assets of discontinued annuity operations | Annuity subsidiaries          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available for sale, amortized cost 31 31      
Fixed maturities, available for sale, allowance for expected credit losses 0 0      
Fixed maturities, Available for sale, Gross Unrealized, Gains 3 4      
Fixed maturities, Available for sale, Gross Unrealized, Losses 0 0      
Available for sale (AFS) fixed maturities 34 35      
Foreign government | Debt Securities          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax 2 4      
Foreign government | Debt Securities | Assets of discontinued annuity operations | Annuity subsidiaries          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax 3 4      
Residential MBS          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available for sale, amortized cost 796 859      
Fixed maturities, available for sale, allowance for expected credit losses 0 0      
Fixed maturities, Available for sale, Gross Unrealized, Gains 53 57      
Fixed maturities, Available for sale, Gross Unrealized, Losses (2) (1)      
Available for sale (AFS) fixed maturities 847 915      
Residential MBS | Assets of discontinued annuity operations | Annuity subsidiaries          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available for sale, amortized cost 2,342 1,953      
Fixed maturities, available for sale, allowance for expected credit losses 3 3      
Fixed maturities, Available for sale, Gross Unrealized, Gains 180 194      
Fixed maturities, Available for sale, Gross Unrealized, Losses (6) (4)      
Available for sale (AFS) fixed maturities 2,513 2,140      
Residential MBS | Debt Securities          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax 51 56      
Residential MBS | Debt Securities | Assets of discontinued annuity operations | Annuity subsidiaries          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax 174 190      
Commercial MBS          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available for sale, amortized cost 106 89      
Fixed maturities, available for sale, allowance for expected credit losses 0 0      
Fixed maturities, Available for sale, Gross Unrealized, Gains 3 3      
Fixed maturities, Available for sale, Gross Unrealized, Losses 0 0      
Available for sale (AFS) fixed maturities 109 92      
Commercial MBS | Assets of discontinued annuity operations | Annuity subsidiaries          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available for sale, amortized cost 603 659      
Fixed maturities, available for sale, allowance for expected credit losses 0 0      
Fixed maturities, Available for sale, Gross Unrealized, Gains 33 40      
Fixed maturities, Available for sale, Gross Unrealized, Losses 0 (1)      
Available for sale (AFS) fixed maturities 636 698      
Commercial MBS | Debt Securities          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax 3 3      
Commercial MBS | Debt Securities | Assets of discontinued annuity operations | Annuity subsidiaries          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax 33 39      
Collateralized loan obligations          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available for sale, amortized cost 1,131 1,065      
Fixed maturities, available for sale, allowance for expected credit losses 1 3      
Fixed maturities, Available for sale, Gross Unrealized, Gains 4 4      
Fixed maturities, Available for sale, Gross Unrealized, Losses (3) (4)      
Collateralized loan obligations | Assets of discontinued annuity operations | Annuity subsidiaries          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available for sale, amortized cost 3,778 3,491      
Fixed maturities, available for sale, allowance for expected credit losses 4 10      
Fixed maturities, Available for sale, Gross Unrealized, Gains 23 23      
Fixed maturities, Available for sale, Gross Unrealized, Losses (9) (13)      
Collateralized loan obligations | Debt Securities          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax 1 0      
Collateralized loan obligations | Debt Securities | Assets of discontinued annuity operations | Annuity subsidiaries          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax 14 10      
Other asset-backed securities          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available for sale, amortized cost 2,178 2,040      
Fixed maturities, available for sale, allowance for expected credit losses 8 7      
Fixed maturities, Available for sale, Gross Unrealized, Gains 24 27      
Fixed maturities, Available for sale, Gross Unrealized, Losses (6) (13)      
Available for sale (AFS) fixed maturities 2,188 2,047      
Other asset-backed securities | Assets of discontinued annuity operations | Annuity subsidiaries          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available for sale, amortized cost 5,095 5,098      
Fixed maturities, available for sale, allowance for expected credit losses 10 11      
Fixed maturities, Available for sale, Gross Unrealized, Gains 144 142      
Fixed maturities, Available for sale, Gross Unrealized, Losses (25) (53)      
Available for sale (AFS) fixed maturities 5,204 5,176      
Other asset-backed securities | Debt Securities          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax 18 14      
Other asset-backed securities | Debt Securities | Assets of discontinued annuity operations | Annuity subsidiaries          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax 119 89      
Corporate and other          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available for sale, amortized cost 2,372 2,199      
Fixed maturities, available for sale, allowance for expected credit losses 1 2 $ 3 $ 0 $ 0
Fixed maturities, Available for sale, Gross Unrealized, Gains 75 88      
Fixed maturities, Available for sale, Gross Unrealized, Losses (4) (3)      
Available for sale (AFS) fixed maturities 2,442 2,282      
Corporate and other | Assets of discontinued annuity operations | Annuity subsidiaries          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available for sale, amortized cost 18,015 17,272      
Fixed maturities, available for sale, allowance for expected credit losses 1 4      
Fixed maturities, Available for sale, Gross Unrealized, Gains 1,367 1,874      
Fixed maturities, Available for sale, Gross Unrealized, Losses (60) (24)      
Available for sale (AFS) fixed maturities 19,321 19,118      
Corporate and other | Debt Securities          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax 71 85      
Corporate and other | Debt Securities | Assets of discontinued annuity operations | Annuity subsidiaries          
Debt Securities, Available-for-sale [Line Items]          
Fixed maturities, available-for-sale securities, accumulated gross unrealized gain (loss), before tax 1,307 1,850      
Managed by third parties | Collateralized loan obligations          
Debt Securities, Available-for-sale [Line Items]          
Available for sale (AFS) fixed maturities 1,131 1,062      
Managed by third parties | Collateralized loan obligations | Assets of discontinued annuity operations | Annuity subsidiaries          
Debt Securities, Available-for-sale [Line Items]          
Available for sale (AFS) fixed maturities $ 3,788 $ 3,491