| **Allowance for Credit Losses (Tables)**                                               | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|----------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
||
| **Allowance for Credit Losses [Abstract]**                                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Allowance for Credit Losses on Finance Receivables and Investments in Operating Leases | Note 6 – Allowance for Credit Losses          The following table provides information related to our allowance for credit losses on finance receivables and investments in operating leases:         Years ended March 31,(Dollars in millions) 2013  2012  2011Allowance for credit losses at beginning of period$ 619 $ 879 $ 1,705Provision for credit losses  121   (98)   (433)Charge-offs, net of recoveries  (213)   (162)   (393)Allowance for credit losses at end of period$ 527 $ 619 $ 879                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| Allowance for Credit Losses and Finance Receivables by Portfolio Segment               | Fiscal Year Ended March 31, 2013                (Dollars in millions)Retail Loan Commercial Dealer Products Total             Allowance for Credit Losses for Finance Receivables:             Beginning Balance at April 1, 2012$ 395 $ 10 $ 119 $ 524Charge-offs   (248)   (1)   - $ (249)Recoveries   70   1   -   71Provisions   116   (5)   (12)   99Ending Balance at March 31, 2013$ 333 $ 5 $ 107 $ 445             Ending Balance: Individually Evaluated for     Impairment$ - $ - $ 33 $ 33Ending Balance: Collectively Evaluated for     Impairment$ 333 $ 5 $ 74 $ 412             Gross Finance Receivables:                        Ending Balance at March 31, 2013$ 47,808 $ 369 $ 14,995 $ 63,172Ending Balance: Individually Evaluated for     Impairment$ - $ - $ 241 $ 241Ending Balance: Collectively Evaluated for     Impairment$ 47,808 $ 369 $ 14,754 $ 62,931Note 6 – Allowance for Credit Losses (Continued)             Fiscal Year Ended March 31, 2012                (Dollars in millions)Retail Loan Commercial Dealer Products Total             Allowance for Credit Losses for Finance Receivables:             Beginning Balance at April 1, 2011$595 $18 $141 $754Charge-offs  (243)  (1)  0 $(244)Recoveries  99  4  0  103Provisions  (56)  (11)  (22)  (89)Ending Balance at March 31, 2012$395 $10 $119 $524             Ending Balance: Individually Evaluated for              Impairment$0 $0 $45 $45Ending Balance: Collectively Evaluated for              Impairment$395 $10 $74 $479             Gross Finance Receivables:                        Ending Balance at March 31, 2012$45,383 $363 $12,865 $58,611Ending Balance: Individually Evaluated for               Impairment$0 $0 $211 $211Ending Balance: Collectively Evaluated for               Impairment$45,383 $363 $12,654 $58,400 |
| Past Due Finance Receivables and Investments in Operating Leases                       | Past Due Finance Receivables and Investments in Operating Leases (Dollars in millions)    March 31, 2013March 31, 2012Aggregate balances 60 or more days past due:            Finance receivables      $ 119 $ 111 Operating leases        36   31Total      $ 155 $ 142                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| Past Due Finance Receivables by Class                                                  | (Dollars in millions)30-59 Days Past Due60-89 Days Past Due90 Days Past DueTotal PastDueCurrentTotalFinance ReceivablesCarryingAmount 90 Days Past Due and Accruing               As of March 31, 2013                           Retail Loan$ 454$ 87$ 31$ 572$ 47,236$ 47,808$ 31Commercial  6  1  -    7  362  369  -  Wholesale  -    -    -    -    8,689  8,689  -  Real estate  -    -    -    -    4,580  4,580  -  Working capital  -    -    -    -    1,726  1,726  -  Total$ 460$ 88$ 31$ 579$ 62,593$ 63,172$ 31                              (Dollars in millions)30-59 Days Past Due60-89 Days Past Due90 Days Past DueTotal PastDueCurrentTotalFinance ReceivablesCarryingAmount 90 Days Past Due and Accruing               As of March 31, 2012                           Retail Loan$ 433$ 80$ 28$ 541$ 44,842$ 45,383$ 28Commercial  8  2  1  11  352  363  1Wholesale  -    -    -    -    7,008  7,008  -  Real estate  -    -    -    -    4,361  4,361  -  Working capital  1  -    -    1  1,495  1,496  -  Total$ 442$ 82$ 29$ 553$ 58,058$ 58,611$ 29                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |

| X                                                                                                                                                                                                                                                                                                                                                                              |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Tabular disclosure of reconciliation of allowance for loan and lease losses for the beginning of a period to the end of a period.
+ References
No definition available.
+ Details**Name:**tmcc_AllowanceForLoanAndLeaseLossesRollForwardTableTextBlock**Namespace Prefix:**tmcc_**Data Type:**nonnum:textBlockItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Tabular disclosure of financing and leases receivables that are past due but not impaired, financing and leases receivables that are 60 days past due and still accruing.
+ References
No definition available.
+ Details**Name:**tmcc_PastDueFinancingAndLeasesReceivablesTableTextBlock**Namespace Prefix:**tmcc_**Data Type:**nonnum:textBlockItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Tabular disclosure of the aging of financing receivables by class.
+ References
No definition available.
+ Details**Name:**tmcc_ScheduleOfFinancingReceivableByClassTableTextBlock**Namespace Prefix:**tmcc_**Data Type:**nonnum:textBlockItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Tabular disclosure of financing receivables (examples of financing receivables include loans, trade accounts receivable and notes receivable) and activity in the allowance for credit losses account.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524
+ Details**Name:**us-gaap_AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock**Namespace Prefix:**us-gaap_**Data Type:**nonnum:textBlockItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                              |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_LoansAndLeasesReceivableDisclosureAbstract**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |