Future Policy Benefits - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2022
Insurance [Abstract]
Liability for Future Policy Benefit, Adverse Development, Expense, Loss At Issue	$ 147	$ 99
Liability for Future Policy Benefit, Adverse Development, Expense, Loss at Issue, Net Remeasurement Loss		$ 31