Investments (Components of Net Investment Gains Losses - Asset Type) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Marketable Securities, Gain (Loss) [Abstract]
Fixed maturity securities AFS	$ (244)	$ (85)
Net investment gains (losses)	(12)	28
Other net investment gains (losses):
Mortgage loans	(192)	(86)
Real estate and real estate joint ventures (excluding changes in estimated fair value)	0	35
Other limited partnership interests (excluding changes in estimated fair value)	(1)	(50)
Other gains (losses)	(5)	6
Subtotal - investment portfolio gains (losses)	(454)	(152)
Change In Estimated Fair Value Of Other Limited Partnership Interests And Real Estate Joint Ventures	3	3
Non-investment portfolio gains (losses)	64	(226)
Subtotal	67	(223)
Net investment gains (losses)	$ (387)	$ (375)