Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Revenue Recognition [Abstract]
Allowance for doubtful accounts for insurance receivables	$ 26	$ 28
Minimum
Revenue Recognition [Abstract]
Coverages to vehicle or consumer goods owners	1 month
Service contract term	1 year
Maximum
Revenue Recognition [Abstract]
Coverages to vehicle or consumer goods owners	10 years
Service contract term	20 years