Investments - Schedule of Credit Losses Recognized in Net Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Realized capital gains and losses by asset type
Total fixed income securities	$ (115)	$ (12)
Total credit losses by asset type	(116)	(12)
Commitments to fund commercial mortgage loans and bank loans	1	0
Fixed income securities
Realized capital gains and losses by asset type
Total fixed income securities	4	(9)
Corporate
Realized capital gains and losses by asset type
Total fixed income securities	4	(9)
Bank loans
Realized capital gains and losses by asset type
Total credit losses by asset type	3	(3)
Other
Realized capital gains and losses by asset type
Total credit losses by asset type	$ (123)	$ 0