Allowance for Credit Losses - Additional Information (Details) - Finance Receivables, Net [Member] - USD ($) $ in Millions	Mar. 31, 2024		Mar. 31, 2023		Mar. 31, 2022
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses	$ 1,684	[1]	$ 1,513	[2]	$ 1,272
Dealer Products [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses	135	[2]	83	[2]	$ 77
TMNA [Member] | Financial Guarantee [Member] | Dealer Products [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Ending Balance: collectively evaluated for impairment	1,300		1,000
Private Toyota Distributors [Member] | Financial Guarantee [Member] | Dealer Products [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Ending Balance: collectively evaluated for impairment	$ 231		$ 199

[1] Ending balance includes $47 million of allowance for credit losses recorded in Other liabilities on the Consolidated Balance Sheet which is related to off-balance sheet lending commitments in the dealer products portfolio.

[2] Ending balance includes $24 million of allowance for credit losses recorded in Other liabilities on the Consolidated Balance Sheet which is related to off-balance sheet lending commitments in the dealer products portfolio.