Investments (Net Investment Gains/Losses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Investment [Line Items]
Net losses on investments	$ (91)	$ (174)
Fixed Maturities [Member]
Investment [Line Items]
Debt Securities, Available-for-sale, Realized Gain	10	20
Debt Securities, Available-for-sale, Realized Loss	(115)	(78)
Impairment losses recognized in income	(7)	(20)
Debt Securities, Available-for-sale, Realized Gain (Loss)	(112)	(78)
Equity Securities [Member]
Investment [Line Items]
Unrealized losses recognized on equity securities still held at the end of the period	(1)	(71)
Net realized losses recognized on equity securities sold during the period	(1)	(14)
Net losses on equity securities	(2)	(85)
Other Investments [Member]
Investment [Line Items]
Gross gains	27	23
Gross losses	(1)	(30)
Impairment losses recognized in income	(3)	(4)
Net gains (losses) on other investments	$ 23	$ (11)