Investments - Available-for-sale Impairment Losses Recognized in Earnings (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Available-For-Sale Impairment Losses [Abstract]
Impairment losses recognized in earnings	$ 14	$ 8
Mortgage Receivable
Available-For-Sale Impairment Losses [Abstract]
Gain (loss) on mortgage loans due to changes in expected credit losses	0	0
Corporate and other bonds
Available-For-Sale Impairment Losses [Abstract]
Impairment losses recognized in earnings	9	8
Asset-backed
Available-For-Sale Impairment Losses [Abstract]
Impairment losses recognized in earnings	$ 5