Finance Receivables, Net - Net Financing Receivables (Details) - USD ($) $ in Millions		Jun. 30, 2023	Mar. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross finance receivables		$ 94,707	$ 91,769
Allowance for credit losses		(1,545)	(1,489)
Finance receivables, net		93,162	90,280
Finance Receivables, Net [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross finance receivables		94,586	91,638
Deferred origination costs		1,340	1,315
Deferred income		(1,219)	(1,184)
Allowance for credit losses		(1,545)	(1,489)
Finance receivables, net		93,162	90,280
Finance Receivables, Net [Member] | Retail receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross finance receivables	[1]	81,617	79,515
Allowance for credit losses		(1,483)	(1,430)
Finance Receivables, Net [Member] | Dealer financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross finance receivables		12,969	12,123
Allowance for credit losses		$ (62)	$ (59)

[1] Includes gross securitized retail receivables of $28.0 billion and $29.0 billion as of June 30, 2023 and March 31, 2023, respectively.