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Investments - Realized capital gains and losses (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Realized capital gains and losses by asset type      
Realized capital gains (losses) $ 341 $ (175) $ 49
Impairment write-downs (21) (9) (41)
Change in intent write-downs 0 0 (4)
Net OTTI losses recognized in earnings (21) (9) (45)
Sales 54 (27) 110
Valuation of equity investments 297 (146) 0
Valuation and settlements of derivative instruments 11 7 (16)
Realized gain 65 34  
Realized loss (35) (66)  
Fixed income securities      
Realized capital gains and losses by asset type      
Realized capital gains (losses) 25 (40) (6)
Realized gain     134
Realized loss     (86)
Mortgage loans      
Realized capital gains and losses by asset type      
Realized capital gains (losses) 0 2 1
Net OTTI losses recognized in earnings 0 0  
Equity securities      
Realized capital gains and losses by asset type      
Realized capital gains (losses) 276 (124) 21
Net OTTI losses recognized in earnings 0 0  
Limited partnership interests      
Realized capital gains and losses by asset type      
Realized capital gains (losses) 43 (22) 46
Net OTTI losses recognized in earnings (2) 0  
Derivatives      
Realized capital gains and losses by asset type      
Realized capital gains (losses) 11 10 (16)
Other      
Realized capital gains and losses by asset type      
Realized capital gains (losses) (14) (1) $ 3
Net OTTI losses recognized in earnings $ (14) $ (1)