Investments - Schedule of Rollforward of Credit Loss Allowance for Fixed Income Securities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Ending balance	$ (22)	$ (37)	$ (22)	$ (37)
Fixed income securities
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Beginning balance	(19)	(29)	(36)	(13)
Credit losses on securities for which credit losses not previously reported	(3)	(8)	(10)	(12)
Net (increases) decreases related to credit losses previously reported	0	1	3	(11)
(Increase) decrease of allowance related to sales and other	0	(1)	3	(1)
Write-offs	0	0	18	0
Ending balance	(22)	(37)	(22)	(37)
Municipal
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Ending balance	(2)	0	(2)	0
Corporate bonds
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Ending balance	(18)	(34)	(18)	(34)
ABS
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Ending balance	$ (2)	$ (3)	$ (2)	$ (3)