Investments - Realized capital gains and losses by asset type (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	$ 14	$ (267)
Fixed income securities
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	(136)	(152)
Equity securities
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	167	(347)
Mortgage loans
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	0	(1)
Limited partnership interests
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	22	(101)
Derivatives
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	(52)	318
Other investments
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	$ 13	$ 16