Investments - Schedule of Net Investment (Losses) Gains (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Other investments:
Net gains (losses) on investments	$ (651)	$ (455)	$ (702)
Fixed maturity securities
Fixed maturity securities:
Gross realized gains from sales	123	158	47
Gross realized losses from sales	(236)	(479)	(488)
Impairment losses recognized in income	(21)	(17)	(15)
Net realized gains (losses) on fixed maturity securities	(134)	(338)	(456)
Equity securities
Equity securities:
Unrealized gains (losses) recognized on equity securities still held	(7)	(6)	(1)
Net realized gains (losses) recognized on equity securities sold	(8)	(9)	6
Net realized gains (losses) on equity securities	(15)	(15)	5
Other invested assets
Fixed maturity securities:
Impairment losses recognized in income	(435)	(126)	(291)
Other investments:
Gross gains	43	49	103
Gross losses	(110)	(25)	(63)
Net gains (losses) on other investments	$ (502)	$ (102)	$ (251)