Finance Receivables, Net - Net Financing Receivables (Details) - USD ($) $ in Millions		Mar. 31, 2024	Mar. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross finance receivables		$ 103,306	$ 91,769
Allowance for credit losses		(1,637)	(1,489)
Finance receivables, net		101,669	90,280
Finance Receivables, Net [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross finance receivables		103,331	91,638
Deferred origination costs		1,399	1,315
Deferred income		(1,424)	(1,184)
Allowance for credit losses		(1,637)	(1,489)
Finance receivables, net		101,669	90,280
Finance Receivables, Net [Member] | Retail receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross finance receivables	[1]	87,150	79,515
Allowance for credit losses		(1,549)	(1,430)
Finance Receivables, Net [Member] | Dealer financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross finance receivables		16,181	12,123
Allowance for credit losses		$ (88)	$ (59)

[1] Includes gross securitized retail receivables of $31.5 billion and $29.0 billion as of March 31, 2024 and 2023, respectively