| **Fair Value Measurements (Narratives) (Details) (USD $)In Millions, unless otherwise specified** | Mar. 31, 2014 | Mar. 31, 2013 |
|---------------------------------------------------------------------------------------------------|---------------|---------------|
| **Fair Value Measurements [Abstract]**                                                            |          |          |
| Derivative asset counterparty credit valuation adjustment                                         | $ 1           | $ 1           |
| Derivative liability non-performance credit valuation adjustment                                  | 1             | 1             |
| Nonrecurring [Member] | Level 3 [Member]                                                          |          |          |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**  |          |          |
| Net finance receivables                                                                           | $ 177         | $ 208         |

| X                                                                                                                                                                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of counterparty credit valuation adjustments recorded as of the balance sheet date pertaining to derivative assets.
+ References
No definition available.
+ Details**Name:**tmcc_FairValueDerivativeAssetCounterpartyCreditValuationAdjustment**Namespace Prefix:**tmcc_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of non-performance credit valuation adjustments recorded as of the balance sheet date pertaining to derivative liabilities.
+ References
No definition available.
+ Details**Name:**tmcc_FairValueDerivativeLiabilityNonPerformanceCreditValuationAdjustment**Namespace Prefix:**tmcc_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**tmcc_FairValueMeasurementsAbstract**Namespace Prefix:**tmcc_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value portion of an agreement for an unconditional promise by the maker to pay the holder a definite sum of money at a future date.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph b -Article 5
+ Details**Name:**us-gaap_NotesReceivableFairValueDisclosure**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |