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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