| **Fair Value Measurements (Using Significant Unobservable Inputs) (Details) (USD $)In Millions, unless otherwise specified**                                                          | 12 Months Ended |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------|
||
| **Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]**                                                                      |            |   |
| Fair value,                                                                                                                                                                           | $ 128           | $ 79 |
| Gains/(losses) included in earnings                                                                                                                                                   | 34              | 25 |
| Gains/(losses) included in other comprehensive income                                                                                                                                 | (2)             | 0 |
| Purchases                                                                                                                                                                             | 26              | 44 |
| Issuances                                                                                                                                                                             | 0               | 0 |
| Sales                                                                                                                                                                                 | (8)             | (7) |
| Settlements                                                                                                                                                                           | (23)            | (40) |
| Transfers in to Level 3                                                                                                                                                               | 9               | 27 |
| Transfers out of Level 3                                                                                                                                                              | (2)             | 0 |
| Fair value,                                                                                                                                                                           | 162             | 128 |
| The amount of total gains or (losses) for the period included in earnings attributable to the change in unrealized gains or losses related to assets still held at the reporting date | 21              | 11 |
| Available-for-sale securities [Member]                                                                                                                                                |            |   |
| **Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]**                                                                      |            |   |
| Fair value,                                                                                                                                                                           | 73              | 21 |
| Gains/(losses) included in earnings                                                                                                                                                   | 0               | 0 |
| Gains/(losses) included in other comprehensive income                                                                                                                                 | (2)             | 0 |
| Purchases                                                                                                                                                                             | 26              | 44 |
| Issuances                                                                                                                                                                             | 0               | 0 |
| Sales                                                                                                                                                                                 | (8)             | (7) |
| Settlements                                                                                                                                                                           | (7)             | (12) |
| Transfers in to Level 3                                                                                                                                                               | 9               | 27 |
| Transfers out of Level 3                                                                                                                                                              | (2)             | 0 |
| Fair value,                                                                                                                                                                           | 89              | 73 |
| U.S. government and agency obligations [Member]                                                                                                                                       |            |   |
| **Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]**                                                                      |            |   |
| Fair value,                                                                                                                                                                           | 0               |   |
| Gains/(losses) included in earnings                                                                                                                                                   | 0               |   |
| Gains/(losses) included in other comprehensive income                                                                                                                                 | 0               |   |
| Purchases                                                                                                                                                                             | 0               |   |
| Issuances                                                                                                                                                                             | 0               |   |
| Sales                                                                                                                                                                                 | 0               |   |
| Settlements                                                                                                                                                                           | 0               |   |
| Transfers in to Level 3                                                                                                                                                               | 2               |   |
| Transfers out of Level 3                                                                                                                                                              | 0               |   |
| Fair value,                                                                                                                                                                           | 2               |   |
| Corporate debt securities [Member]                                                                                                                                                    |            |   |
| **Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]**                                                                      |            |   |
| Fair value,                                                                                                                                                                           | 4               | 1 |
| Gains/(losses) included in earnings                                                                                                                                                   | 0               | 0 |
| Gains/(losses) included in other comprehensive income                                                                                                                                 | 0               | 0 |
| Purchases                                                                                                                                                                             | 3               | 0 |
| Issuances                                                                                                                                                                             | 0               | 0 |
| Sales                                                                                                                                                                                 | 0               | 0 |
| Settlements                                                                                                                                                                           | 0               | 0 |
| Transfers in to Level 3                                                                                                                                                               | 7               | 3 |
| Transfers out of Level 3                                                                                                                                                              | (2)             | 0 |
| Fair value,                                                                                                                                                                           | 12              | 4 |
| Mortgage-backed securities [Member]                                                                                                                                                   |            |   |
| **Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]**                                                                      |            |   |
| Fair value,                                                                                                                                                                           | 56              | 19 |
| Gains/(losses) included in earnings                                                                                                                                                   | 0               | 0 |
| Gains/(losses) included in other comprehensive income                                                                                                                                 | (2)             | 0 |
| Purchases                                                                                                                                                                             | 7               | 37 |
| Issuances                                                                                                                                                                             | 0               | 0 |
| Sales                                                                                                                                                                                 | (8)             | (6) |
| Settlements                                                                                                                                                                           | (5)             | (7) |
| Transfers in to Level 3                                                                                                                                                               | 0               | 13 |
| Transfers out of Level 3                                                                                                                                                              | 0               | 0 |
| Fair value,                                                                                                                                                                           | 48              | 56 |
| Asset-backed securities [Member]                                                                                                                                                      |            |   |
| **Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]**                                                                      |            |   |
| Fair value,                                                                                                                                                                           | 13              | 1 |
| Gains/(losses) included in earnings                                                                                                                                                   | 0               | 0 |
| Gains/(losses) included in other comprehensive income                                                                                                                                 | 0               | 0 |
| Purchases                                                                                                                                                                             | 16              | 7 |
| Issuances                                                                                                                                                                             | 0               | 0 |
| Sales                                                                                                                                                                                 | 0               | (1) |
| Settlements                                                                                                                                                                           | (2)             | (5) |
| Transfers in to Level 3                                                                                                                                                               | 0               | 11 |
| Transfers out of Level 3                                                                                                                                                              | 0               | 0 |
| Fair value,                                                                                                                                                                           | 27              | 13 |
| Derivative [Member]                                                                                                                                                                   |            |   |
| **Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]**                                                                      |            |   |
| Fair value,                                                                                                                                                                           | 55              | 58 |
| Gains/(losses) included in earnings                                                                                                                                                   | 34              | 25 |
| Gains/(losses) included in other comprehensive income                                                                                                                                 | 0               | 0 |
| Purchases                                                                                                                                                                             | 0               | 0 |
| Issuances                                                                                                                                                                             | 0               | 0 |
| Sales                                                                                                                                                                                 | 0               | 0 |
| Settlements                                                                                                                                                                           | (16)            | (28) |
| Transfers in to Level 3                                                                                                                                                               | 0               | 0 |
| Transfers out of Level 3                                                                                                                                                              | 0               | 0 |
| Fair value,                                                                                                                                                                           | 73              | 55 |
| The amount of total gains or (losses) for the period included in earnings attributable to the change in unrealized gains or losses related to assets still held at the reporting date | 21              | 11 |
| Interest rate swap [Member]                                                                                                                                                           |            |   |
| **Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]**                                                                      |            |   |
| Fair value,                                                                                                                                                                           | 12              | 13 |
| Gains/(losses) included in earnings                                                                                                                                                   | 5               | 2 |
| Gains/(losses) included in other comprehensive income                                                                                                                                 | 0               | 0 |
| Purchases                                                                                                                                                                             | 0               | 0 |
| Issuances                                                                                                                                                                             | 0               | 0 |
| Sales                                                                                                                                                                                 | 0               | 0 |
| Settlements                                                                                                                                                                           | (14)            | (3) |
| Transfers in to Level 3                                                                                                                                                               | 0               | 0 |
| Transfers out of Level 3                                                                                                                                                              | 0               | 0 |
| Fair value,                                                                                                                                                                           | 3               | 12 |
| The amount of total gains or (losses) for the period included in earnings attributable to the change in unrealized gains or losses related to assets still held at the reporting date | (2)             | 2 |
| Foreign currency swaps [Member]                                                                                                                                                       |            |   |
| **Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]**                                                                      |            |   |
| Fair value,                                                                                                                                                                           | 55              | 69 |
| Gains/(losses) included in earnings                                                                                                                                                   | 17              | 11 |
| Gains/(losses) included in other comprehensive income                                                                                                                                 | 0               | 0 |
| Purchases                                                                                                                                                                             | 0               | 0 |
| Issuances                                                                                                                                                                             | 0               | 0 |
| Sales                                                                                                                                                                                 | 0               | 0 |
| Settlements                                                                                                                                                                           | (2)             | (25) |
| Transfers in to Level 3                                                                                                                                                               | 0               | 0 |
| Transfers out of Level 3                                                                                                                                                              | 0               | 0 |
| Fair value,                                                                                                                                                                           | 70              | 55 |
| The amount of total gains or (losses) for the period included in earnings attributable to the change in unrealized gains or losses related to assets still held at the reporting date | 23              | 8 |
| Embedded derivative liabilities, net                                                                                                                                                  |            |   |
| **Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]**                                                                      |            |   |
| Fair value,                                                                                                                                                                           | (12)            | (24) |
| Gains/(losses) included in earnings                                                                                                                                                   | 12              | 12 |
| Gains/(losses) included in other comprehensive income                                                                                                                                 | 0               | 0 |
| Purchases                                                                                                                                                                             | 0               | 0 |
| Issuances                                                                                                                                                                             | 0               | 0 |
| Sales                                                                                                                                                                                 | 0               | 0 |
| Settlements                                                                                                                                                                           | 0               | 0 |
| Transfers in to Level 3                                                                                                                                                               | 0               | 0 |
| Transfers out of Level 3                                                                                                                                                              | 0               | 0 |
| Fair value,                                                                                                                                                                           | 0               | (12) |
| The amount of total gains or (losses) for the period included in earnings attributable to the change in unrealized gains or losses related to assets still held at the reporting date | $ 0             | $ 1 |

| X                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
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| - Definition
Total gains or losses recognized in earnings, arising from assets and liabilities measured at fair value on a recurring basis using unobservable inputs (level 3).
+ References
No definition available.
+ Details**Name:**tmcc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityGainLossIncludedInEarnings**Namespace Prefix:**tmcc_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Issues that have taken place during the period in relation to assets and liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.
+ References
No definition available.
+ Details**Name:**tmcc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityIssues**Namespace Prefix:**tmcc_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Purchases that have taken place during the period in relation to assets and liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.
+ References
No definition available.
+ Details**Name:**tmcc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityPurchases**Namespace Prefix:**tmcc_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Sales that have taken place during the period in relation to assets and liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.
+ References
No definition available.
+ Details**Name:**tmcc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilitySales**Namespace Prefix:**tmcc_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Settlements that have taken place during the period in relation to assets and liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.
+ References
No definition available.
+ Details**Name:**tmcc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilitySettlements**Namespace Prefix:**tmcc_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Transfers into assets and liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period.
+ References
No definition available.
+ Details**Name:**tmcc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityTransfersIntoLevel3**Namespace Prefix:**tmcc_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Transfers out of assets and liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period.
+ References
No definition available.
+ Details**Name:**tmcc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilityTransfersOutOfLevel3**Namespace Prefix:**tmcc_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents net asset and liability measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.
+ References
No definition available.
+ Details**Name:**tmcc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNetAssetAndLiabilityValue**Namespace Prefix:**tmcc_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of gain (loss) recognized in other comprehensive income, arising from assets, liabilities and financial instruments classified in shareholders' equity measured at fair value on a recurring basis using unobservable inputs (level 3).
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258
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