Investments - Schedule of Rollforward of Credit Loss Allowance for Fixed Income Securities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Credit Losses on Fixed Income Securities [Roll Forward]
Beginning balance	$ (13)	$ (6)
Ending balance	(36)	(13)	$ (6)
Fixed income securities
Credit Losses on Fixed Income Securities [Roll Forward]
Beginning balance	(13)	(6)	(2)
Credit losses on securities for which credit losses not previously reported	(11)	(1)	(5)
Net (increases) decreases related to credit losses previously reported	(11)	(6)	1
(Increase) decrease of allowance related to sales and other	(1)	0	0
Write-offs	0	0	0
Ending balance	(36)	(13)	(6)
Corporate
Credit Losses on Fixed Income Securities [Roll Forward]
Beginning balance	(11)	(6)
Ending balance	(35)	(11)	(6)
ABS
Credit Losses on Fixed Income Securities [Roll Forward]
Beginning balance	(2)	0
Ending balance	$ (1)	$ (2)	$ 0