| **Variable Interest Entities (Details) (USD $)In Millions, unless otherwise specified**                | Mar. 31, 2014 | Mar. 31, 2013 |
|--------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Variable Interest Entity [Line Items]**                                                              |          |          |
| Securities retained by TMCC                                                                            | $ 1,169       | $ 466         |
| Variable Interest Entities Securitized Assets [Member]                                                 |          |          |
| **Variable Interest Entity [Line Items]**                                                              |          |          |
| Restricted Cash                                                                                        | 644           | 491           |
| Gross Securitized Assets                                                                               | 9,881         | 8,299         |
| Net Securitized Assets                                                                                 | 9,657         | 7,990         |
| Other assets                                                                                           | 7             | 12            |
| Variable Interest Entities Securitized Assets [Member] | Retail Finance Receivables [Member]           |          |          |
| **Variable Interest Entity [Line Items]**                                                              |          |          |
| Restricted Cash                                                                                        | 624           | 458           |
| Gross Securitized Assets                                                                               | 9,633         | 7,669         |
| Net Securitized Assets                                                                                 | 9,501         | 7,556         |
| Other assets                                                                                           | 3             | 3             |
| Variable Interest Entities Securitized Assets [Member] | Investments In Operating Leases, Net [Member] |          |          |
| **Variable Interest Entity [Line Items]**                                                              |          |          |
| Restricted Cash                                                                                        | 20            | 33            |
| Gross Securitized Assets                                                                               | 248           | 630           |
| Net Securitized Assets                                                                                 | 156           | 434           |
| Other assets                                                                                           | 4             | 9             |
| Related Liabilities [Member]                                                                           |          |          |
| **Variable Interest Entity [Line Items]**                                                              |          |          |
| Debt                                                                                                   | 8,158         | 7,009         |
| Other Liabilities                                                                                      | 2             | 1             |
| Related Liabilities [Member] | Retail Finance Receivables [Member]                                     |          |          |
| **Variable Interest Entity [Line Items]**                                                              |          |          |
| Debt                                                                                                   | 8,146         | 6,738         |
| Other Liabilities                                                                                      | 2             | 1             |
| Related Liabilities [Member] | Investments In Operating Leases, Net [Member]                           |          |          |
| **Variable Interest Entity [Line Items]**                                                              |          |          |
| Debt                                                                                                   | 12            | 271           |
| Other Liabilities                                                                                      | $ 0           | $ 0           |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The carrying amount of the consolidated Variable Interest Entity's cash received from the pledged receivables and certain reserve deposits held for the securitization trusts. This cash is classified as restricted cash in the reporting entity's statement of financial position and it serves as a source of repayment for the asset-backed securities issued by the trusts.
+ References
No definition available.
+ Details**Name:**tmcc_VariableInterestEntityConsolidatedCarryingAmountLoansAndLeaseReceivableGross**Namespace Prefix:**tmcc_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The carrying amount of the consolidated Variable Interest Entity's assets, net of consideration for deferred origination costs, unearned income, and allowance for credit losses, included in the reporting entity's statement of financial position.
+ References
No definition available.
+ Details**Name:**tmcc_VariableInterestEntityConsolidatedCarryingAmountLoansAndLeaseReceivableNet**Namespace Prefix:**tmcc_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The aggregate carrying amounts of the consolidated Variable Interest Entity's other assets, as of the balance sheet date, not separately disclosed in the balance sheet.
+ References
No definition available.
+ Details**Name:**tmcc_VariableInterestEntityConsolidatedCarryingAmountOtherAssets**Namespace Prefix:**tmcc_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The aggregate carrying amount of the consolidated Variable Interest Entity's liabilities not separately disclosed in the reporting entity's statement of financial position.
+ References
No definition available.
+ Details**Name:**tmcc_VariableInterestEntityConsolidatedCarryingAmountOtherLiabilities**Namespace Prefix:**tmcc_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The carrying amount of the consolidated Variable Interest Entity's cash received from the pledged receivables and certain reserve deposits held for the securitization trusts. This cash is classified as restricted cash in the reporting entity's statement of financial position and it serves as a source of repayment for the asset-backed securities issued by the trusts.
+ References
No definition available.
+ Details**Name:**tmcc_VariableInterestEntityConsolidatedCarryingAmountRestrictedCash**Namespace Prefix:**tmcc_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of securities retained by the reporting entity in the consolidated Variable Interest Entity's debt obligations collateralized by finance receivables.
+ References
No definition available.
+ Details**Name:**tmcc_VariableInterestEntityConsolidatedCarryingAmountSecuredDebtAmountRetainedByReportingEntity**Namespace Prefix:**tmcc_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents the aggregate of total long-term debt, including current and short-term debt of the variable interest entity
+ References
No definition available.
+ Details**Name:**tmcc_VariableInterestEntityConsolidatedCarryingAmountSecuredDebtNetOfAmountRetainedByReportingEntity**Namespace Prefix:**tmcc_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_VariableInterestEntityLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |