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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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