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Investments - Realized capital gains and losses (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Realized capital gains and losses by asset type        
Sales   $ 42 $ 54 $ (27)
Credit losses   (47) (21) (9)
Valuation of equity investments   266 297 (146)
Valuation and settlements of derivative instruments   5 11 7
Realized capital gains and losses $ 4 266 341 (175)
Fixed income securities        
Realized capital gains and losses by asset type        
Realized capital gains and losses   54 25 (40)
Mortgage loans        
Realized capital gains and losses by asset type        
Realized capital gains and losses   (45) 0 2
Equity securities        
Realized capital gains and losses by asset type        
Realized capital gains and losses   225 276 (124)
Limited partnership interests        
Realized capital gains and losses by asset type        
Realized capital gains and losses   38 43 (22)
Derivatives        
Realized capital gains and losses by asset type        
Realized capital gains and losses   5 11 10
Other        
Realized capital gains and losses by asset type        
Realized capital gains and losses   $ (11) $ (14) $ (1)