Increase in line of credit maximum borrowing capacity.

No definition available.

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

- Definition

Lease agreement expiration year.

+ References

No definition available.

+ Details

Name:	tmcc_LeaseAgreementExpirationYear
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

Name:	tmcc_SubventionSupportReceivableRelatedParties
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

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

- Definition

Date which lease or group of leases is set to expire, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
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

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 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

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

- Details

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

- Details

Name:	us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis=tmcc_FinancingSupportToAffiliatesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=tmcc_ToyotaFinancialServicesMexicoSADeCVMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=tmcc_ToyotaFinancialSavingsBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_ResidentialMortgageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=tmcc_OtherFinancingSupportArrangementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=tmcc_ToyotaMotorNorthAmericaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=tmcc_OperationalSupportArrangementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=tmcc_ToyotaMotorInsuranceServicesIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Related Party Transactions - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	May 31, 2019	Mar. 31, 2019	Mar. 31, 2018
Related Party Transaction [Line Items]
Subvention support receivable		$ 171	$ 279
Financing Support from Affiliates [Member]
Related Party Transaction [Line Items]
Maximum borrowing capacity		8,500	3,600
Financing Support to Affiliates [Member]
Related Party Transaction [Line Items]
Maximum borrowing capacity		5,400	5,600
Toyota Financial Services Mexico, S.A. de C.V. [Member] \| Subsequent Event [Member] \| Financing Support to Affiliates [Member]
Related Party Transaction [Line Items]
Increase in financing support available to affiliates	$ 1,500
TFSB [Member] \| Residential Mortgage [Member] \| Other Financing Support Arrangements [Member]
Related Party Transaction [Line Items]
Annual maximum participation		60
Loans purchased		$ 23	$ 30
TMNA [Member]
Related Party Transaction [Line Items]
Lease agreement expiration date		Aug. 31, 2032
TMNA [Member] \| Operational Support Arrangements [Member]
Related Party Transaction [Line Items]
Lease agreement expiration year		2032
Lease agreement expiration date		Sep. 30, 2018
TMIS [Member] \| Operational Support Arrangements [Member]
Related Party Transaction [Line Items]
Risk ceded to reinsurers		99.00%