Investments - Available-for-sale Impairment Losses (Gains) Recognized in Earnings (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Fixed maturity securities available-for-sale:
Impairment losses recognized in earnings	$ 6	$ 12	$ 22	$ 32
Mortgage Receivable
Fixed maturity securities available-for-sale:
Losses recognized on mortgage loans due to changes in expected credit losses	0	0	5	0
Corporate and other bonds
Fixed maturity securities available-for-sale:
Impairment losses recognized in earnings	4	8	15	23
Asset-backed
Fixed maturity securities available-for-sale:
Impairment losses recognized in earnings	$ 2	$ 4	$ 7	$ 9