Finance Receivables, Net - Net Financing Receivables (Details) - USD ($) $ in Millions		Mar. 31, 2023	Mar. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross finance receivables		$ 91,769	$ 83,678
Allowance for credit losses		(1,489)	(1,246)
Finance receivables, net		90,280	82,432
Finance Receivables, Net [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross finance receivables		91,638	83,450
Deferred origination costs		1,315	1,330
Deferred income		(1,184)	(1,102)
Allowance for credit losses		(1,489)	(1,246)
Finance receivables, net		90,280	82,432
Finance Receivables, Net [Member] | Retail receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross finance receivables	[1]	79,515	73,152
Allowance for credit losses		(1,430)	(1,195)
Finance Receivables, Net [Member] | Dealer financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross finance receivables		12,123	10,298
Allowance for credit losses		$ (59)	$ (51)

[1] Includes securitized retail receivables of $29.0 billion and $21.2 billion as of March 31, 2023 and 2022, respectively