Investments - OTTI losses by asset type (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other-than-temporary impairment losses by asset type
Credit losses recognized in net income	$ (42)	$ (32)	$ (26)
Total credit losses by asset type	(42)	(33)	(26)
Commitments to fund commercial mortgage loans and bank loans	0	1	0
Fixed income securities
Other-than-temporary impairment losses by asset type
Credit losses recognized in net income	(4)	(3)	(9)
Corporate
Other-than-temporary impairment losses by asset type
Credit losses recognized in net income	(5)	(1)	(6)
ABS
Other-than-temporary impairment losses by asset type
Credit losses recognized in net income	1	(2)	(3)
Mortgage loans
Other-than-temporary impairment losses by asset type
Credit losses recognized in net income	18	(1)	0
Limited partnership interests
Other-than-temporary impairment losses by asset type
Credit losses recognized in net income	(34)	(6)	(4)
Bank loans
Other-than-temporary impairment losses by asset type
Credit losses recognized in net income	$ (22)	$ (23)	$ (13)