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Investments (Fixed Maturity Proceeds) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Debt Securities [Line Items] |  |
Proceeds from maturities/prepayments - AFS | $ 21,470 | $ 9,997
Proceeds from maturities/prepayments - HTM | 11 | 40
Fixed maturities | Available-for-sale |  |
Debt Securities [Line Items] |  |
Proceeds from sales | 14,690 | 5,153
Proceeds from maturities/prepayments - AFS | 6,894 | 4,883
Gross investment gains from sales and maturities | 1,603 | 468
Gross investment losses from sales and maturities | (389) | (61)
Write-down recognized in earnings | 0 | (91)
(Addition to) release of allowance for credit losses - AFS | 2 | (158)
Fixed maturities | Held-to-maturity |  |
Debt Securities [Line Items] |  |
Proceeds from maturities/prepayments - HTM | 12 | 41
(Addition to) release of allowance for credit Losses - HTM | 2 | 0
Fixed maturities | Available-for-sale |  |
Debt Securities [Line Items] |  |
Noncash or Part Noncash Divestiture, Amount of Consideration Received | 114 | 39
Fixed maturities | Held-to-maturity |  |
Debt Securities [Line Items] |  |
Noncash or Part Noncash Divestiture, Amount of Consideration Received | $ 1 | $ 1

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