Investments - Schedule of Net Gains (Losses) on Investments and Derivatives by Asset Type (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	$ (349)	$ (164)
Fixed income securities
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	(128)	(101)
Equity securities
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	(112)	62
Limited partnership interests
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	(5)	8
Derivatives
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	(19)	(8)
Other investments
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	(18)	(2)
Other
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	$ (67)	$ (123)