Investments - Realized capital gains and losses by asset type (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	$ (733)	$ 287	$ (1,000)	$ 713
Fixed income securities
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	(326)	86	(478)	269
Equity securities
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	(636)	152	(983)	316
Mortgage loans
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	0	13	(1)	19
Limited partnership interests
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	(74)	12	(175)	16
Derivatives
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	272	(3)	590	8
Other investments
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	$ 31	$ 27	$ 47	$ 85