Investments - Schedule of Net Gains (Losses) on Investments and Derivatives by Asset Type (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	$ 252	$ 243	$ (241)	$ (24)
Fixed income securities
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	107	105	(271)	(92)
Equity securities
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	191	119	243	195
Mortgage loans
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	(6)	(1)	(6)	0
Limited partnership interests
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	(32)	(8)	(24)	(13)
Derivatives
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	6	20	(78)	(3)
Other investments
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	(14)	8	(38)	12
Other
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	$ 0	$ 0	$ (67)	$ (123)