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Investments - Mortgage loans (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Investment [Line Items]        
Realized capital gains (losses) $ 4 $ 1,356 $ 1,885 $ (877)
Mortgage loans        
Investment [Line Items]        
Payments to acquire investments 234      
Reduction of allowance related to sales $ 17