Investments - OTTI losses by asset type (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Realized capital gains and losses by asset type
Fixed income securities	$ (12)	$ (11)
Total credit losses by asset type	(12)	(11)
Commitments to fund commercial mortgage loans and bank loans	0	0
Fixed income securities
Realized capital gains and losses by asset type
Fixed income securities	(9)	0
Corporate
Realized capital gains and losses by asset type
Fixed income securities	(9)	0
Mortgage loans
Realized capital gains and losses by asset type
Total credit losses by asset type	0	(1)
Bank loans, net
Realized capital gains and losses by asset type
Total credit losses by asset type	$ (3)	$ (10)