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Investments (Fixed Maturity Proceeds) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Debt Securities [Line Items]        
Proceeds from maturities/prepayments - AFS     $ 20,664 $ 25,681
Proceeds from maturities/prepayments - HTM     58 35
Fixed maturities | Available-for-sale        
Debt Securities [Line Items]        
Proceeds from sales $ 5,217 $ 6,659 10,370 16,821
Proceeds from maturities/prepayments - AFS 5,539 4,704 10,422 9,192
Gross investment gains from sales and maturities 405 228 873 711
Gross investment losses from sales and maturities (149) (95) (210) (283)
OTTI recognized in earnings   (64)   (99)
Write-down recognized in earnings (64)   (155)  
(Addition to) release of allowance for credit losses - AFS (80)   (238)  
Fixed maturities | Held-to-maturity        
Debt Securities [Line Items]        
Proceeds from maturities/prepayments - HTM 22 $ 23 63 37
(Addition to) release of allowance for credit Losses - HTM $ 0   0  
Fixed maturities | Available-for-sale        
Debt Securities [Line Items]        
Noncash or Part Noncash Divestiture, Amount of Consideration Received     128 332
Fixed maturities | Held-to-maturity        
Debt Securities [Line Items]        
Noncash or Part Noncash Divestiture, Amount of Consideration Received     $ 5 $ 2