Investments - Realized capital gains and losses by asset type (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	$ (267)	$ 426
Fixed income securities
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	(152)	183
Equity securities
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	(347)	164
Mortgage loans
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	(1)	6
Limited partnership interests
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	(101)	4
Derivatives
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	318	11
Other investments
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	$ 16	$ 58