Investments - Schedule of Investment Gains (Losses) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Other investments:
Net losses on investments	$ (132)	$ 0	$ (248)	$ (594)
Fixed maturity securities:
Fixed maturity securities:
Gross realized gains from sales	12	39	75	88
Gross realized losses from sales	(80)	(51)	(151)	(195)
Impairment losses recognized in income	(6)	0	(42)	(10)
Net realized losses from sales of fixed maturity securities	(74)	(12)	(118)	(117)
Equity securities:
Equity securities:
Unrealized gains (losses) recognized on equity securities still held at the end of the period	(8)	8	(8)	2
Net realized losses recognized on equity securities sold during the period	(4)	(7)	(7)	(9)
Net gains (losses) on equity securities	(12)	1	(15)	(7)
Other investments:
Other investments:
Gross gains from sales	21	28	58	41
Gross losses from sales	(12)	0	(23)	(100)
Other realized losses recognized in income	(55)	(17)	(150)	(411)
Net gains (losses) on other investments	$ (46)	$ 11	$ (115)	$ (470)

Available-for-Sale Securities, Equity Securities

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