Finance Receivables, Net - Net Financing Receivables (Details) - USD ($) $ in Millions	Dec. 31, 2022	Mar. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross finance receivables	$ 90,778	$ 83,678
Allowance for credit losses	(1,484)	(1,246)
Finance receivables, net	89,294	82,432
Finance Receivables, Net [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross finance receivables	90,595	83,450
Deferred origination costs	1,332	1,330
Deferred income	(1,149)	(1,102)
Allowance for credit losses	(1,484)	(1,246)
Finance receivables, net	89,294	82,432
Finance Receivables, Net [Member] | Retail receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross finance receivables	78,794	73,152
Allowance for credit losses	(1,426)	(1,195)
Finance Receivables, Net [Member] | Dealer financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross finance receivables	11,801	10,298
Allowance for credit losses	$ (58)	$ (51)