Pre- and Post-Modification Amortized Cost Basis Balances for Finance Receivables Modified by Portfolio Class (Detail) - Customer Retail - Fleet - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022
Financing Receivable Modifications [Line Items]
Pre-Modification, Amortized Cost Basis	$ 1.6	$ 9.7
Post-Modification, Amortized Cost Basis	$ 1.6	$ 9.7