Allowance for Credit Losses - Additional Information (Details) - Finance Receivables, Net [Member] - Financial Guarantee [Member] - Dealer Products [Member] - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
TMNA [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Ending Balance: collectively evaluated for impairment	$ 1,200	$ 976
Private Toyota Distributors [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Ending Balance: collectively evaluated for impairment	$ 219	$ 186

The balance of financing receivables that were collectively evaluated for impairment.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 4
-Subparagraph (SAB Topic 6.L(5)(a))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480418/310-10-S99-4

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11C
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-11C

Name:	us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant