Investments (Net Investment Gains/Losses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Investment [Line Items]
Net losses on investments	$ (128)	$ (255)	$ (219)	$ (428)
Fixed Maturities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Realized Gain	11	16	21	36
Debt Securities, Available-for-sale, Realized Loss	(99)	(176)	(214)	(254)
Impairment losses recognized in income	(3)	(1)	(10)	(21)
Debt Securities, Available-for-sale, Realized Gain (Loss)	(91)	(161)	(203)	(239)
Equity Securities [Member]
Investment [Line Items]
Unrealized gains (losses) recognized on equity securities still held at the end of the period	2	(83)	(2)	(154)
Net realized gains (losses) recognized on equity securities sold during the period	1	(5)	4	(19)
Net gains (losses) on equity securities	3	(88)	2	(173)
Other Investments [Member]
Investment [Line Items]
Gross gains	2	10	20	33
Gross losses	(16)	(15)	(9)	(44)
Impairment losses recognized in income	(26)	(1)	(29)	(5)
Net losses on other investments	$ (40)	$ (6)	$ (18)	$ (16)