Investments - Realized capital gains and losses by asset type (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	$ (167)	$ 105	$ (1,167)	$ 818
Fixed income securities
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	(166)	86	(644)	355
Equity securities
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	(239)	6	(1,222)	322
Mortgage loans
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	1	0	0	19
Limited partnership interests
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	(49)	(15)	(224)	1
Derivatives
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	299	46	889	54
Other investments
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	$ (13)	$ (18)	$ 34	$ 67