Investments - Net gains (losses) on investments and derivatives by asset type (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	$ 1,084	$ 1,087	$ 1,538
Fixed income securities
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	425	925	433
Equity securities
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	520	117	930
Mortgage loans
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	20	(1)	0
Limited partnership interests
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	(52)	(14)	157
Derivatives
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	49	49	(26)
Other investments
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	$ 122	$ 11	$ 44