Investments - OTTI losses by asset type (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Other-than-temporary impairment losses by asset type
Fixed income securities	$ (54)	$ (42)	$ (32)
Total credit losses by asset type	(54)	(42)	(33)
Commitments to fund commercial mortgage loans and bank loans	0	0	1
Fixed income securities
Other-than-temporary impairment losses by asset type
Fixed income securities	(7)	(4)	(3)
Corporate
Other-than-temporary impairment losses by asset type
Fixed income securities	(6)	(5)	(1)
ABS
Other-than-temporary impairment losses by asset type
Fixed income securities	(1)	1	(2)
Mortgage loans
Other-than-temporary impairment losses by asset type
Total credit losses by asset type	(1)	18	(1)
Limited partnership interests
Other-than-temporary impairment losses by asset type
Total credit losses by asset type	(4)	(34)	(6)
Bank loans, net
Other-than-temporary impairment losses by asset type
Total credit losses by asset type	(26)	(22)	(23)
Real estate
Other-than-temporary impairment losses by asset type
Total credit losses by asset type	$ (16)	$ 0	$ 0