Investments - Rollforward of credit loss allowance for fixed income securities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Ending balance	$ (22)	$ (6)
Fixed income securities
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Beginning balance	(13)	(6)
Credit losses on securities for which credit losses not previously reported	0	0
Net increases related to credit losses previously reported	(9)	0
Reduction of allowance related to sales	0	0
Write-offs	0	0
Ending balance	(22)	(6)
Corporate
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Ending balance	(20)	(6)
ABS
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Ending balance	$ (2)	$ 0