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Investments (Fixed Maturity Proceeds) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Debt Securities [Line Items]    
Proceeds from maturities/prepayments - AFS $ 9,997 $ 14,063
Proceeds from maturities/prepayments - HTM 40 14
Fixed maturities | Available-for-sale    
Debt Securities [Line Items]    
Proceeds from sales 5,153 10,162
Proceeds from maturities/prepayments - AFS 4,883 4,488
Gross investment gains from sales and maturities 468 483
Gross investment losses from sales and maturities (61) (188)
OTTI recognized in earnings   (35)
Write-down recognized in earnings (91)  
Allowance for Credit Losses - AFS (158)  
Fixed maturities | Held-to-maturity    
Debt Securities [Line Items]    
Proceeds from maturities/prepayments - HTM 41 14
Allowance for Credit Losses - HTM 0  
Fixed maturities | Available-for-sale    
Debt Securities [Line Items]    
Noncash or Part Noncash Divestiture, Amount of Consideration Received 39 587
Fixed maturities | Held-to-maturity    
Debt Securities [Line Items]    
Noncash or Part Noncash Divestiture, Amount of Consideration Received $ 1 $ 0