| **Fair Value Measurements (Tables)**                                                     | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
||
| **Fair Value Measurements [Abstract]**                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis               |               As of March 31, 2014     Fair value measurements on a recurring basis           Counterparty  (Dollars in millions) Level 1 Level 2 Level 3netting & collateralFairvalue Cash equivalents:           Money market instruments$ 730$ 694$ -$ -$ 1,424 Certificates of deposit  -  1,437  -  -  1,437 Commercial paper  -  708  -  -  708 Cash equivalents total  730  2,839  -  -  3,569Restricted Cash Equivalents- money market instruments  1,077  -  -  -  1,077Available-for-sale securities:           Debt instruments:            U.S. government and agency obligations  398  252  2  -  652  Municipal debt securities  -  11  -  -  11  Certificates of deposit  -  1,599  -  -  1,599  Commercial paper  -  507  -  -  507  Corporate debt securities  -  157  12  -  169  Mortgage-backed securities:             U.S. government agency  -  60  -  -  60   Non-agency residential  -  -  5  -  5   Non-agency commercial  -  -  43  -  43  Asset-backed securities  -  -  27  -  27 Equity instruments:            Fixed income mutual funds:             Short-term sector fund  -  44  -  -  44   U.S. government sector fund  -  327  -  -  327   Municipal sector fund  -  22  -  -  22   Investment grade corporate sector fund  -  316  -  -  316   High-yield sector fund  -  45  -  -  45   Real return sector fund  -  274  -  -  274   Mortgage sector fund  -  520  -  -  520   Asset-backed securities sector fund  -  50  -  -  50   Emerging market sector fund  -  66  -  -  66   International sector fund  -  171  -  -  171  Equity mutual fund  481  -  -  -  481 Available-for-sale securities total  879  4,421  89  -  5,389 Derivative assets:             Foreign currency swaps  -  804  70  -  874  Interest rate swaps  -  358  3  -  361  Counterparty netting and collateral  -  -  -  (1,186)  (1,186) Derivative assets total  -  1,162  73  (1,186)  49Assets at fair value  2,686  8,422  162  (1,186)  10,084 Derivative liabilities:            Foreign currency swaps  -  (252)  -  -  (252)  Interest rate swaps  -  (553)  -  -  (553)  Counterparty netting and collateral  -  -  -  799  799Liabilities at fair value   -  (805)  -  799  (6)Net assets at fair value$ 2,686$ 7,617$ 162$ (387)$ 10,078Note 2 – Fair Value Measurements (Continued)                    As of March 31, 2013                  Fair value measurements on a recurring basis          Counterparty (Dollars in millions) Level 1 Level 2 Level 3netting & collateralFairvalue Cash equivalents:           Money market instruments$900$608$0$0$1,508 Certificates of deposit 0 1,945 0 0 1,945 Commercial paper 0 798 0 0 798 Cash equivalents total 900 3,351 0 0 4,251Available-for-sale securities:           Debt instruments:            U.S. government and agency obligations 42 62 0 0 104  Municipal debt securities 0 16 0 0 16  Certificates of deposit 0 2,041 0 0 2,041  Commercial paper 0 495 0 0 495  Foreign government debt securities 0 3 0 0 3  Corporate debt securities 0 124 4 0 128  Mortgage-backed securities:             U.S. government agency 0 87 0 0 87   Non-agency residential 0 0 5 0 5   Non-agency commercial 0 0 51 0 51  Asset-backed securities 0 0 13 0 13 Equity instruments:            Fixed income mutual funds:             Short-term sector fund 0 43 0 0 43   U.S. government sector fund 0 312 0 0 312   Municipal sector fund 0 22 0 0 22   Investment grade corporate sector fund 0 327 0 0 327   High-yield sector fund 0 42 0 0 42   Real return sector fund 0 293 0 0 293   Mortgage sector fund 0 648 0 0 648   Asset-backed securities sector fund 0 47 0 0 47   Emerging market sector fund 0 66 0 0 66   International sector fund 0 170 0 0 170  Equity mutual fund 484 0 0 0 484 Available-for-sale securities total 526 4,798 73 0 5,397 Derivative assets:             Foreign currency swaps 0 1,076 63 0 1,139  Interest rate swaps 0 568 12 0 580  Counterparty netting and collateral 0 0 0 (1,661) (1,661) Derivative assets total 0 1,644 75 (1,661) 58Assets at fair value 1,426 9,793 148 (1,661) 9,706 Derivative liabilities:            Foreign currency swaps 0 (123) (8) 0 (131)  Interest rate swaps 0 (766) 0 0 (766)  Counterparty netting and collateral 0 0 0 892 892 Derivative liabilities total 0 (889) (8) 892 (5) Embedded derivative liabilities  0 0 (12) 0 (12)Liabilities at fair value 0 (889) (20) 892 (17)Net assets at fair value$1,426$8,904$128$(769)$9,689 |
| Assets and Liabilities Measured on Recurring Basis Using Significant Unobservable Inputs | Year Ended March 31, 2014                             Fair Value Measurements Using Significant Unobservable Inputs (Level 3)   Available-for-sale securities DerivativesTotal netassets(liabilities)                          U.S.     Total      Total      governmentCorporateMortgageAsset- available- InterestForeign Embeddedderivative     and agencydebt backedbacked for-sale  rate currency derivatives,assets  (Dollars in millions)obligations securities securities securities  securities swapsswaps net(liabilities)  Fair value, April 1, 2013$ -$  4$ 56$ 13 $ 73 $ 12$ 55$ (12)$ 55$ 128Total gains (losses)                         Included in earnings  -   -  -  -   -   5  17  12  34  34  Included in other                         comprehensive income  -   -  (2)  -   (2)   -  -  -  -  (2)Purchases, issuances, sales, and                         settlements                         Purchases  -   3  7  16   26   -  -  -  -  26  Issuances  -   -  -  -   -   -  -  -  -  -  Sales  -   -  (8)  -   (8)   -  -  -  -  (8)  Settlements  -   -  (5)  (2)   (7)   (14)  (2)  -  (16)  (23)Transfers in to Level 3  2   7  -  -   9   -  -  -  -  9Transfers out of Level 3  -   (2)  -  -   (2)   -  -  -  -  (2)Fair value, March 31, 2014$ 2$  12$ 48$ 27 $ 89 $ 3$ 70$ -$ 73$ 162The amount of total (losses)/gains                           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)$ 23$ -$ 21$ 21                          Note 2 – Fair Value Measurements (Continued)                       Year Ended March 31, 2013                          Fair Value Measurements Using Significant Unobservable Inputs (Level 3)   Available-for-sale securities DerivativesTotal netassets(liabilities)                             Total       Total     CorporateMortgage Asset- available- Interest Foreign Embeddedderivative     debtbacked  backed for-sale  rate  currency derivatives,assets  (Dollars in millions)securitiessecurities  securities  securities swaps swaps net(liabilities) Fair value, April 1, 2012$ 1$ 19$ 1 $ 21 $ 13$ 69$ (24)$ 58$ 79Total gains                      Included in earnings  -  -  -   -   2  11  12  25  25  Included in other                      comprehensive income  -  -  -   -   -  -  -  -  -Purchases, issuances, sales, and                      settlements                      Purchases  -  37  7   44   -  -  -  -  44  Issuances  -  -  -   -   -  -  -  -  -  Sales  -  (6)  (1)   (7)   -  -  -  -  (7)  Settlements  -  (7)  (5)   (12)   (3)  (25)  -  (28)  (40)Transfers in to Level 3  3  13  11   27   -  -  -  -  27Transfers out of Level 3  -  -  -   -   -  -  -  -  -Fair value, March 31, 2013$ 4$ 56$ 13 $ 73 $ 12$ 55$ (12)$ 55$ 128The amount of total gains                     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$ 8$ 1$ 11$ 11                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| Carrying Value of Certain Financial Instruments                                          |      Fair value measurement hierarchy   Carrying      Total Fair(Dollars in millions)valueLevel 1Level 2Level 3ValueAs of March 31, 2014                       Financial assets           Finance receivables, net            Retail loan$ 48,892$ -$ -$ 49,392$ 49,392  Commercial  174  -  -  160  160  Wholesale  9,344  -  -  9,391  9,391  Real estate  4,601  -  -  4,552  4,552  Working capital  1,802  -  -  1,807  1,807             Financial liabilities           Commercial paper$ 27,709$ -$ 27,709$ -$ 27,709 Unsecured notes and loans payable  49,500  -  49,697  736  50,433 Secured notes and loans payable  8,158  -  -  8,165  8,165Note 2 - Fair Value Measurements (Continued)                      Fair value measurement hierarchy   Carrying      Total Fair(Dollars in millions)valueLevel 1Level 2Level 3ValueAs of March 31, 2013                       Financial assets           Finance receivables, net            Retail loan$ 47,312$ -$ -$ 48,313$ 48,313  Commercial  134  -  -  126  126  Wholesale  8,620  -  -  8,644  8,644  Real estate  4,531  -  -  4,480  4,480  Working capital  1,695  -  -  1,708  1,708             Financial liabilities           Commercial paper$ 24,590$ -$ 24,590$ -$ 24,590 Unsecured notes and loans payable  47,233  -  47,901  874  48,775 Secured notes and loans payable  7,009  -  -  7,016  7,016                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Tabular disclosure of the fair value measurement of total net assets (liabilities) using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income, and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issuances, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset and liability.
+ References
No definition available.
+ Details**Name:**tmcc_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock**Namespace Prefix:**tmcc_**Data Type:**nonnum:textBlockItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**tmcc_FairValueMeasurementsAbstract**Namespace Prefix:**tmcc_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.
+ 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 (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13467-108611Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13476-108611Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610
+ Details**Name:**us-gaap_FairValueByBalanceSheetGroupingTextBlock**Namespace Prefix:**us-gaap_**Data Type:**nonnum:textBlockItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant 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 1 -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258
+ Details**Name:**us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock**Namespace Prefix:**us-gaap_**Data Type:**nonnum:textBlockItemType**Balance Type:**na**Period Type:**duration |