Investments - Schedule of Rollforward of Credit Loss Allowance for Fixed Income Securities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Credit Losses on Fixed Income Securities [Roll Forward]
Beginning balance	$ (36)	$ (13)
Ending balance	(17)	(36)	$ (13)
Fixed income securities
Credit Losses on Fixed Income Securities [Roll Forward]
Beginning balance	(36)	(13)	(6)
Credit losses on securities for which credit losses not previously reported	(8)	(11)	(1)
Net decreases (increases) related to credit losses previously reported	2	(11)	(6)
Decrease (increase) related to sales and other	3	(1)	0
Write-offs	22	0	0
Ending balance	(17)	(36)	(13)
Corporate
Credit Losses on Fixed Income Securities [Roll Forward]
Beginning balance	(35)	(11)
Ending balance	(16)	(35)	(11)
ABS
Credit Losses on Fixed Income Securities [Roll Forward]
Beginning balance	(1)	(2)
Ending balance	$ (1)	$ (1)	$ (2)