Summary of Significant Accounting Policies, Revenue Recognition (Details)	12 Months Ended
	Dec. 31, 2021 USD ($)
Revenue Recognition [Abstract]
Allowance for doubtful accounts for insurance receivables	$ 29,000,000
Minimum
Revenue Recognition [Abstract]
Coverages to vehicle or consumer goods owners	1 month
Standard contract term	2 months
Service contract term	1 year
Maximum
Revenue Recognition [Abstract]
Coverages to vehicle or consumer goods owners	10 years
Standard contract term	60 months
Service contract term	20 years