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Investments - Net Realized Capital Gains (Losses) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses) $ (136) $ (35) $ (318) $ 405
Proceeds from sale of investments        
Proceeds on sales 574 420 1,444 3,862
Gross gains 8 9 18 501
Gross losses 8 1 33 2
Embedded derivatives - fixed maturities        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses) (1) 0 (3) (2)
Guaranteed benefit derivatives        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses) 12 (12) 16 37
Derivatives        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses) 5 (8) 57 (48)
Other investments        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses) 0 94 (1) 94
Mortgages [Member]        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses) 1 21 4 84
Fixed Maturities, Available-for-sale, Including Securities Pledged        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses) (3) 11 (62) 520
Fixed Maturities, at Fair Value Using the Fair Value Option        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses) (133) (145) (308) (287)
Equity securities        
Available-for-sale Securities Including Securities Pledged [Line Items]        
Realized capital gains (losses) $ (17) $ 4 $ (21) $ 7