Investments - Schedule of Rollforward of Credit Loss Allowance for Fixed Income Securities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Ending balance	$ (37)	$ (13)	$ (37)	$ (13)
Fixed income securities
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Beginning balance	(29)	(10)	(13)	(6)
Credit losses on securities for which credit losses not previously reported	(8)	(2)	(12)	(2)
Net (increases) decreases related to credit losses previously reported	1	(2)	(11)	(6)
(Increase) decrease of allowance related to sales and other	(1)	1	(1)	1
Write-offs	0	0	0	0
Ending balance	(37)	(13)	(37)	(13)
Corporate bonds
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Ending balance	(34)	(11)	(34)	(11)
ABS
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Ending balance	$ (3)	$ (2)	$ (3)	$ (2)