Investments - Schedule of Net Gains (Losses) on Investments and Derivatives by Asset Type (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	$ (225)	$ (300)	$ (1,072)
Fixed income securities
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	(200)	(540)	(875)
Equity securities
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	82	282	(900)
Mortgage loans
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	(1)	(4)	(1)
Limited partnership interests
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	(9)	4	(191)
Derivatives
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	(14)	(84)	874
Other investments
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	40	42	21
Other
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	$ (123)	$ 0	$ 0