Warehouse Receivables & Warehouse Lines of Credit - Narrative (Details)	12 Months Ended
Dec. 31, 2021 USD ($)
Warehouse Agreement Borrowings
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Lines of credit principal outstanding	$ 2,500,000,000

For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, the maximum amount borrowed at any time during the period.

No definition available.

Name:	us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration