Investments - Rollforward of credit loss allowance for mortgage loans (Details) - Mortgage loans - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Beginning balance	$ (7)	$ (30)	$ (6)	$ (67)
Net (increases) decreases related to credit losses	1	2	0	39
Write-offs	0	0	0	0
Ending balance	$ (6)	(28)	$ (6)	(28)
Discontinued Operations, Held-for-sale
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Ending balance		$ (21)		$ (21)