Investments - Net gains (losses) on investments and derivatives by asset type (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	$ (151)	$ (733)	$ (137)	$ (1,000)
Fixed income securities
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	(132)	(326)	(268)	(478)
Equity securities
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	21	(636)	188	(983)
Mortgage loans
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	(3)	0	(3)	(1)
Limited partnership interests
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	(15)	(74)	7	(175)
Derivatives
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	(7)	272	(59)	590
Other investments
Realized capital gains and losses by asset type
Net gains (losses) on investments and derivatives	$ (15)	$ 31	$ (2)	$ 47