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Investments - Net Realized Capital Gains (Losses) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses) $ (70) $ (88) $ (388) $ 317
Proceeds from sale of investments        
Proceeds on sales 723 279 2,167 4,141
Gross gains 16 16 34 517
Gross losses 12 1 45 3
Embedded derivatives - fixed maturities        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses) (2) (1) (5) (3)
Guaranteed benefit derivatives        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses) (5) 2 11 39
Derivatives        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses) 125 4 182 (44)
Other investments        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses) 0 1 (1) 95
Mortgages [Member]        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses) (1) 12 3 96
Fixed Maturities, Available-for-sale, Including Securities Pledged        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses) 13 2 (49) 522
Fixed Maturities, at Fair Value Using the Fair Value Option        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses) (196) (108) (504) (395)
Equity securities        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses) $ (4) $ 0 $ (25) $ 7