Investments - Schedule of Rollforward of Credit Loss Allowance for Fixed Income Securities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Ending balance	$ (19)	$ (29)	$ (19)	$ (29)
Fixed income securities
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Beginning balance	(17)	(22)	(36)	(13)
Credit losses on securities for which credit losses not previously reported	(4)	(4)	(7)	(4)
Net (increases) decreases related to credit losses previously reported	(1)	(3)	3	(12)
(Increase) decrease of allowance related to sales and other	0	0	3	0
Write-offs	3	0	18	0
Ending balance	(19)	(29)	(19)	(29)
Corporate bonds
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Ending balance	(18)	(27)	(18)	(27)
ABS
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Ending balance	$ (1)	$ (2)	$ (1)	$ (2)