Investments - Schedule of Rollforward of Credit Loss Allowance for Fixed Income Securities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Ending balance	$ (18)	$ (17)
Fixed income securities
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Beginning balance	(17)	(36)
Credit losses on securities for which credit losses not previously reported	(1)	(3)
Net (increases) decreases related to credit losses previously reported	0	4
(Increase) decrease related to sales and other	0	3
Write-offs	0	15
Ending balance	(18)	(17)
Corporate bonds
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Ending balance	(17)	(16)
ABS
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Ending balance	$ (1)	$ (1)