Investments (Fixed Maturity Proceeds) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Debt Securities [Line Items]
Proceeds from maturities/prepayments	$ 10,794	$ 11,178
Proceeds from maturities/prepayments - HTM	0	7
Held-to-Maturity Securities Netting
Debt Securities [Line Items]
Non cash Or Part Non cash Divestitures Amount Of Consideration Received	0	1
Available for sale Securities Netting
Debt Securities [Line Items]
Non cash Or Part Non cash Divestitures Amount Of Consideration Received	111	(160)
Fixed maturities | Available-for-sale
Debt Securities [Line Items]
Proceeds from sales	5,751	7,350
Proceeds from maturities/prepayments	4,932	3,988
Gross investment gains from sales and maturities	394	290
Gross investment losses from sales and maturities	(360)	(305)
Write-downs recognized in earnings	(5)	(9)
(Addition to) release of allowance for credit losses	(11)	(131)
Fixed maturities | Held-to-Maturity Securities [Member]
Debt Securities [Line Items]
Proceeds from maturities/prepayments - HTM	0	7
(Addition to) release of allowance for credit losses	$ 0	$ 0