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

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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

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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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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of paid and unpaid cash dividends declared for classes of stock, for example, but not limited to, common and preferred.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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=120391452&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=120398452&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=120400017&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

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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

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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

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Balance Type:	na
Period Type:	duration

- Details

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- Details

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Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis=tmcc_FinancingSupportFromAffiliatesMember
Namespace Prefix:
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- Details

Name:	us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis=tmcc_FinancingSupportToAffiliatesMember
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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
Balance Type:
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- Details

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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
	Apr. 30, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Related Party Transaction [Line Items]
Subvention support receivable		$ 113,000,000	$ 184,000,000	$ 113,000,000
Three Year Revolving Credit Facility Expiring 2022 [Member]
Related Party Transaction [Line Items]
Maximum borrowing capacity			5,000,000,000.0
Three Year Revolving Credit Facility Expiring 2025 [Member] \| Subsequent Event [Member]
Related Party Transaction [Line Items]
Maximum borrowing capacity	$ 5,000,000,000.0
Financing Support from Affiliates [Member]
Related Party Transaction [Line Items]
Maximum borrowing capacity		8,400,000,000	8,600,000,000	8,400,000,000
Financing Support to Affiliates [Member]
Related Party Transaction [Line Items]
Maximum borrowing capacity		6,800,000,000	7,100,000,000	6,800,000,000
Toyota Financial Services International Corporation [Member]
Related Party Transaction [Line Items]
Declared and paid cash dividends			700,000,000
Toyota Finance New Zealand Limited [Member] \| Financing Support to Affiliates [Member] \| Subsequent Event [Member]
Related Party Transaction [Line Items]
Increase in financing support available to affiliates	$ 250,000,000
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		$ 3,000,000,000.0		3,000,000,000.0
Credit facility, interest rate		1.86%
Credit facility, maturity date		Jul. 30, 2020
Toyota Financial Savings Bank [Member] \| Residential Mortgage [Member] \| Other Financing Support Arrangements [Member]
Related Party Transaction [Line Items]
Annual maximum participation			60,000,000
Loans purchased			$ 15,000,000	$ 22,000,000
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%