Increase in line of credit maximum borrowing capacity.

No definition available.

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Namespace Prefix:	tmcc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Lease agreement expiration year.

+ References

No definition available.

+ Details

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Namespace Prefix:	tmcc_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of loans acquired from related party during the period.

+ References

No definition available.

+ Details

Name:	tmcc_LoansAcquiredFromRelatedPartiesDuringPeriod
Namespace Prefix:	tmcc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Maximum amount of loans allowed to purchase from related party per year.

+ References

No definition available.

+ Details

Name:	tmcc_LoansAcquiredFromRelatedPartiesMaximumAmountPerYear
Namespace Prefix:	tmcc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

For an unclassified balance sheet, amounts of subvention support due from parties associated with the reporting entity.

+ References

No definition available.

+ Details

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Namespace Prefix:	tmcc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Ratio of insurance contracts that are subject to reinsurance participation to all contracts in force.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The effective interest rate during the reporting period.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

+ Details

Name:	us-gaap_OperatingLeaseLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

+ Details

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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201602Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=tmcc_ThreeYearRevolvingCreditFacilityExpiring2022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis=tmcc_FinancingSupportFromAffiliatesMember
Namespace Prefix:
Data Type:	na
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- Details

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- Details

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Data Type:	na
Balance Type:
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- Details

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Data Type:	na
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- Details

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- Details

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Namespace Prefix:
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- Details

Name:	us-gaap_RelatedPartyTransactionAxis=tmcc_OtherFinancingSupportArrangementsMember
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- Details

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- Details

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- Details

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- Details

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Related Party Transactions - Additional Information (Details) - USD ($)	1 Months Ended		12 Months Ended
	Mar. 31, 2020	May 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Related Party Transaction [Line Items]
Subvention support receivable	$ 113,000,000		$ 113,000,000	$ 171,000,000
Operating lease right-of-use assets	114,000,000		114,000,000
Operating lease liabilities	120,000,000		120,000,000
Accounting Standards Update 2016-02 [Member]
Related Party Transaction [Line Items]
Operating lease right-of-use assets	85,000,000		85,000,000
Operating lease liabilities	85,000,000		85,000,000
Three Year Revolving Credit Facility Expiring 2022 [Member]
Related Party Transaction [Line Items]
Maximum borrowing capacity	5,000,000,000		5,000,000,000
Credit facilities amount outstanding	3,000,000,000		$ 3,000,000,000
Credit facility, maturity date			Sep. 30, 2020
Financing Support from Affiliates [Member]
Related Party Transaction [Line Items]
Maximum borrowing capacity	8,400,000,000		$ 8,400,000,000	8,500,000,000
Financing Support to Affiliates [Member]
Related Party Transaction [Line Items]
Maximum borrowing capacity	6,800,000,000		6,800,000,000	5,400,000,000
Toyota Financial Services Mexico, S.A. de C.V. [Member] \| Financing Support to Affiliates [Member]
Related Party Transaction [Line Items]
Increase in financing support available to affiliates		$ 1,500,000,000
Toyota Motor Sales, U.S.A., Inc. [Member] \| Three Year Revolving Credit Facility Expiring 2022 [Member]
Related Party Transaction [Line Items]
Credit facilities amount outstanding	$ 3,000,000,000		3,000,000,000
Credit facility, interest rate	1.86%
Credit facility, maturity date	Sep. 30, 2020
TFSB [Member] \| Residential Mortgage [Member] \| Other Financing Support Arrangements [Member]
Related Party Transaction [Line Items]
Annual maximum participation	$ 60,000,000		60,000,000
Loans purchased			$ 22,000,000	$ 23,000,000
TMNA [Member] \| Operational Support Arrangements [Member]
Related Party Transaction [Line Items]
Lease agreement expiration year			2032
TMNA [Member] \| Operational Support Arrangements [Member] \| Customer Service Center [Member]
Related Party Transaction [Line Items]
Lease agreement expiration year			2029
TMNA [Member] \| Operational Support Arrangements [Member] \| Dallas Data Center [Member]
Related Party Transaction [Line Items]
Lease agreement expiration year			2026
TMIS [Member] \| Operational Support Arrangements [Member]
Related Party Transaction [Line Items]
Risk ceded to reinsurers			99.00%