Investments - OTTI losses 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
Fixed income securities	$ (37)	$ (13)	$ (49)	$ (24)
Total credit losses by asset type	(37)	(13)	(49)	(24)
Commitments to fund commercial mortgage loans and bank loans	0	0	0	0
Fixed income securities
Realized capital gains and losses by asset type
Fixed income securities	(7)	(4)	(16)	(4)
Corporate
Realized capital gains and losses by asset type
Fixed income securities	(7)	(4)	(16)	(4)
Mortgage loans
Realized capital gains and losses by asset type
Total credit losses by asset type	(3)	0	(3)	(1)
Limited partnership interests
Realized capital gains and losses by asset type
Total credit losses by asset type	(16)	(3)	(16)	(3)
Bank loans
Realized capital gains and losses by asset type
Total credit losses by asset type	$ (11)	$ (6)	$ (14)	$ (16)