Investments - Schedule of Net Gains (Losses) on Investments and Derivatives by Asset Type (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	$ (144)	$ (103)	$ (493)	$ (267)
Fixed income securities
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	(250)	(96)	(378)	(197)
Equity securities
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	164	14	52	76
Mortgage loans
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	0	1	0	1
Limited partnership interests
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	13	(13)	8	(5)
Derivatives
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	(65)	(15)	(84)	(23)
Other investments
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	(6)	6	(24)	4
Other
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	$ 0	$ 0	$ (67)	$ (123)