Finance Receivables - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Retail Finance Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit loss (as a percent)	3.20%	3.20%
Nonaccrual loans	$ 809	$ 685
Commercial Finance Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	0	$ 0
Financing receivable, allowance for credit loss, modification of loans	$ 0
Commercial Finance Receivables | Floorplan Advances
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percent of revolving balance	99.70%	99.00%