Investments - Schedule of Net Investment (Losses) and Gains (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Other investments:
Net losses on investments	$ (126)	$ (137)	$ (379)	$ (355)
Fixed maturity securities:
Fixed maturity securities:
Gross realized gains from sales	53	13	92	34
Gross realized losses from sales	(107)	(164)	(354)	(377)
Impairment (losses) gains recognized in income	(9)	2	(13)	(8)
Net realized losses from sales of fixed maturity securities	(63)	(149)	(275)	(351)
Equity securities:
Equity securities:
Unrealized gains (losses) recognized on equity securities still held at the end of the period	3	0	4	(1)
Net realized (losses) gains recognized on equity securities sold during the period	(3)	2	(4)	5
Net gains on equity securities	0	2	0	4
Other investments:
Fixed maturity securities:
Impairment (losses) gains recognized in income	(98)	(8)	(124)	(37)
Other investments:
Gross gains	35	86	45	91
Gross losses	0	(68)	(25)	(62)
Net (losses) gains on other investments	$ (63)	$ 10	$ (104)	$ (8)