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Investments - Available for sale fixed maturities (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]              
Fixed maturities, available for sale, amortized cost $ 10,211   $ 8,812        
Fixed maturities, available for sale, allowance for expected credit losses 9 $ 9 12 $ 14 $ 14   $ 0
Available for sale (AFS) fixed maturities 10,427   9,084        
Total fixed maturities              
Debt Securities, Available-for-sale [Line Items]              
Fixed maturities, available for sale, amortized cost 10,211   8,812        
Fixed maturities, available for sale, allowance for expected credit losses 9   12        
Fixed maturities, available for sale, gross unrealized, gains 239   305        
Fixed maturities, available for sale, gross unrealized, losses (14)   (21)        
Available for sale (AFS) fixed maturities 10,427   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     31,596        
Fixed maturities, available for sale, allowance for expected credit losses     28        
Fixed maturities, available for sale, gross unrealized, gains     2,652        
Fixed maturities, available for sale, gross unrealized, losses     (97)        
Available for sale (AFS) fixed maturities     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 225   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     2,555        
U.S. Government and government agencies              
Debt Securities, Available-for-sale [Line Items]              
Fixed maturities, available for sale, amortized cost 216   192        
Fixed maturities, available for sale, allowance for expected credit losses 0   0        
Fixed maturities, available for sale, gross unrealized, gains 3   6        
Fixed maturities, available for sale, gross unrealized, losses (1)   0        
Available for sale (AFS) fixed maturities 218   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     39        
Fixed maturities, available for sale, allowance for expected credit losses     0        
Fixed maturities, available for sale, gross unrealized, gains     5        
Fixed maturities, available for sale, gross unrealized, losses     0        
Available for sale (AFS) fixed maturities     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 2   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     5        
States, municipalities and political subdivisions              
Debt Securities, Available-for-sale [Line Items]              
Fixed maturities, available for sale, amortized cost 1,849   2,196        
Fixed maturities, available for sale, allowance for expected credit losses 0   0        
Fixed maturities, available for sale, gross unrealized, gains 77   116        
Fixed maturities, available for sale, gross unrealized, losses 0   0        
Available for sale (AFS) fixed maturities 1,926   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     3,053        
Fixed maturities, available for sale, allowance for expected credit losses     0        
Fixed maturities, available for sale, gross unrealized, gains     370        
Fixed maturities, available for sale, gross unrealized, losses     (2)        
Available for sale (AFS) fixed maturities     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 77   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     368        
Foreign government              
Debt Securities, Available-for-sale [Line Items]              
Fixed maturities, available for sale, amortized cost 216   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 (1)   0        
Available for sale (AFS) fixed maturities 217   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        
Fixed maturities, available for sale, allowance for expected credit losses     0        
Fixed maturities, available for sale, gross unrealized, gains     4        
Fixed maturities, available for sale, gross unrealized, losses     0        
Available for sale (AFS) fixed maturities     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 1   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     4        
Residential MBS              
Debt Securities, Available-for-sale [Line Items]              
Fixed maturities, available for sale, amortized cost 704   859        
Fixed maturities, available for sale, allowance for expected credit losses 0   0        
Fixed maturities, available for sale, gross unrealized, gains 51   57        
Fixed maturities, available for sale, gross unrealized, losses (1)   (1)        
Available for sale (AFS) fixed maturities 754   915        
Residential MBS | Assets of discontinued annuity operations | Annuity subsidiaries              
Debt Securities, Available-for-sale [Line Items]              
Fixed maturities, available for sale, amortized cost     1,953        
Fixed maturities, available for sale, allowance for expected credit losses     3        
Fixed maturities, available for sale, gross unrealized, gains     194        
Fixed maturities, available for sale, gross unrealized, losses     (4)        
Available for sale (AFS) fixed maturities     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 50   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     190        
Commercial MBS              
Debt Securities, Available-for-sale [Line Items]              
Fixed maturities, available for sale, amortized cost 110   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 113   92        
Commercial MBS | Assets of discontinued annuity operations | Annuity subsidiaries              
Debt Securities, Available-for-sale [Line Items]              
Fixed maturities, available for sale, amortized cost     659        
Fixed maturities, available for sale, allowance for expected credit losses     0        
Fixed maturities, available for sale, gross unrealized, gains     40        
Fixed maturities, available for sale, gross unrealized, losses     (1)        
Available for sale (AFS) fixed maturities     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     39        
Collateralized loan obligations              
Debt Securities, Available-for-sale [Line Items]              
Fixed maturities, available for sale, amortized cost 1,827   1,065        
Fixed maturities, available for sale, allowance for expected credit losses 1   3        
Fixed maturities, available for sale, gross unrealized, gains 5   4        
Fixed maturities, available for sale, gross unrealized, losses (2)   (4)        
Available for sale (AFS) fixed maturities 1,829   1,062        
Collateralized loan obligations | Assets of discontinued annuity operations | Annuity subsidiaries              
Debt Securities, Available-for-sale [Line Items]              
Fixed maturities, available for sale, amortized cost     3,491        
Fixed maturities, available for sale, allowance for expected credit losses     10        
Fixed maturities, available for sale, gross unrealized, gains     23        
Fixed maturities, available for sale, gross unrealized, losses     (13)        
Available for sale (AFS) fixed maturities     3,491        
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 3   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     10        
Other asset-backed securities              
Debt Securities, Available-for-sale [Line Items]              
Fixed maturities, available for sale, amortized cost 2,631   2,040        
Fixed maturities, available for sale, allowance for expected credit losses 7   7        
Fixed maturities, available for sale, gross unrealized, gains 25   27        
Fixed maturities, available for sale, gross unrealized, losses (5)   (13)        
Available for sale (AFS) fixed maturities 2,644   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     5,098        
Fixed maturities, available for sale, allowance for expected credit losses     11        
Fixed maturities, available for sale, gross unrealized, gains     142        
Fixed maturities, available for sale, gross unrealized, losses     (53)        
Available for sale (AFS) fixed maturities     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 20   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     89        
Corporate and other              
Debt Securities, Available-for-sale [Line Items]              
Fixed maturities, available for sale, amortized cost 2,658   2,199        
Fixed maturities, available for sale, allowance for expected credit losses 1 $ 1 2 $ 3 $ 3 $ 0 $ 0
Fixed maturities, available for sale, gross unrealized, gains 73   88        
Fixed maturities, available for sale, gross unrealized, losses (4)   (3)        
Available for sale (AFS) fixed maturities 2,726   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     17,272        
Fixed maturities, available for sale, allowance for expected credit losses     4        
Fixed maturities, available for sale, gross unrealized, gains     1,874        
Fixed maturities, available for sale, gross unrealized, losses     (24)        
Available for sale (AFS) fixed maturities     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 $ 69   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     $ 1,850