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Investments - Net appreciation (decline) recognized in net income (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Realized capital gains and losses by asset type    
Net appreciation (decline) recognized in net income $ (615) $ 463
Equity securities    
Realized capital gains and losses by asset type    
Net appreciation (decline) recognized in net income (560) 496
Limited partnership interests    
Realized capital gains and losses by asset type    
Net appreciation (decline) recognized in net income $ (55) $ (33)