Finance Receivables, Net - Net Financing Receivables (Details) - USD ($) $ in Millions		Jun. 30, 2024	Mar. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross finance receivables		$ 105,102	$ 103,306
Allowance for credit losses		(1,653)	(1,637)
Finance receivables, net		103,449	101,669
Finance Receivables, Net [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross finance receivables		105,250	103,331
Deferred origination costs		1,387	1,399
Deferred income		(1,535)	(1,424)
Allowance for credit losses		(1,653)	(1,637)
Finance receivables, net		103,449	101,669
Finance Receivables, Net [Member] | Retail receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross finance receivables	[1]	88,676	87,150
Allowance for credit losses		(1,559)	(1,549)
Finance Receivables, Net [Member] | Dealer financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross finance receivables		16,574	16,181
Allowance for credit losses		$ (94)	$ (88)

[1] Includes gross securitized retail receivables of $29.9 billion and $31.5 billion as of June 30, 2024 and March 31, 2024, respectively.