Investments - OTTI losses by asset type (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Realized capital gains and losses by asset type
Fixed income securities	$ (11)	$ 2
Total credit losses by asset type	(11)	2
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	0	2
Corporate
Realized capital gains and losses by asset type
Fixed income securities	0	1
ABS
Realized capital gains and losses by asset type
Fixed income securities	0	1
Mortgage loans
Realized capital gains and losses by asset type
Total credit losses by asset type	(1)	6
Bank loans, net
Realized capital gains and losses by asset type
Total credit losses by asset type	$ (10)	$ (6)