Investments (Components of Net Investment Gains Losses - Asset Type) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Marketable Securities, Gain (Loss) [Abstract]
Fixed maturity securities AFS	$ (698)	$ (286)	$ (2,274)	$ (1,555)
Equity Securities, FV-NI, Gain (Loss)	(14)	(23)	66	(115)
Other net investment gains (losses):
Mortgage loans	11	47	(194)	139
Real estate and real estate joint ventures (excluding changes in estimated fair value)	1	0	32	163
Other limited partnership interests (excluding changes in estimated fair value)	0	(1)	12	15
Other gains (losses) (2)	(161)	54	(141)	230
Subtotal - investment portfolio gains (losses)	(861)	(209)	(2,499)	(1,123)
Change In Estimated Fair Value Of Other Limited Partnership Interests And Real Estate Joint Ventures	(3)	(18)	(6)	(12)
Non-investment portfolio gains (losses)	(63)	(184)	(145)	(475)
Subtotal	(66)	(202)	(151)	(487)
Net investment gains (losses)	$ (927)	$ (411)	$ (2,650)	$ (1,610)