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Investments (Fixed Maturity Proceeds) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Securities[Line Items]      
Proceeds from maturities/prepayments - AFS $ 52,306 $ 59,675 $ 58,244
Proceeds from maturities/prepayments 100 94 155
Fixed maturities | Available-for-sale      
Debt Securities[Line Items]      
Proceeds from sales 32,283 38,230 34,002
Proceeds from maturities/prepayments - AFS 20,036 21,207 24,460
Gross investment gains from sales and maturities 1,715 1,412 1,548
Gross investment losses from sales and maturities (434) (905) (700)
OTTI recognized in earnings (315) (279) (267)
Fixed maturities | Held-to-maturity      
Debt Securities[Line Items]      
Proceeds from maturities/prepayments 99 94 153
Fixed maturities | Available-for-sale      
Debt Securities[Line Items]      
Noncash Part Noncash Divestiture, Amount of Consideration Received 13 (238) 218
Fixed maturities | Held-to-maturity      
Debt Securities[Line Items]      
Noncash Part Noncash Divestiture, Amount of Consideration Received $ (1) $ (1) $ (2)