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Investments (Fixed Maturity Proceeds) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Debt Securities[Line Items] |  |  |
Proceeds from maturities/prepayments | $ 44,097 | $ 50,823 | $ 64,759
Proceeds from maturities/prepayments - HTM | 22 | 38 | 239
Available-for-sale-Securities Netting |  |  |
Debt Securities[Line Items] |  |  |
NoncashOrPartNoncashDivestituresAmountOfConsiderationReceived1 | (74) | (144) | 450
Held-to-Maturity Securities Netting |  |  |
Debt Securities[Line Items] |  |  |
NoncashOrPartNoncashDivestituresAmountOfConsiderationReceived1 | 1 | 1 | (1)
Fixed maturities | Available-for-sale |  |  |
Debt Securities[Line Items] |  |  |
Proceeds from sales | 27,161 | 33,010 | 36,333
Proceeds from maturities/prepayments | 17,010 | 17,957 | 27,976
Gross investment gains from sales and maturities | 973 | 1,240 | 2,565
Gross investment losses from sales and maturities | (2,183) | (2,589) | (648)
Write-downs recognized in earnings | (81) | (116) | (1)
(Addition to) release of allowance for credit losses | (22) | (24) | 19
Fixed maturities | Held-to-maturity |  |  |
Debt Securities[Line Items] |  |  |
Proceeds from maturities/prepayments - HTM | 21 | 37 | 239
(Addition to) release of allowance for credit Losses | $ 2 | $ 2 | $ 4

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