Finance Receivables, Net - Additional Information (Details) - USD ($)	3 Months Ended	9 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Mar. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable accrued interest before allowance for credit loss	$ 398,000,000	$ 398,000,000	$ 284,000,000
Retail Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable accrued interest before allowance for credit loss	319,000,000	319,000,000	235,000,000
Gross Charges Off		536,000,000
Dealer Products [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable accrued interest before allowance for credit loss	79,000,000	79,000,000	$ 49,000,000
Gross Charges Off	$ 0	$ 0