| **Allowance for Credit Losses (Tables)**                                               | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
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| **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 receivablesand investments in operating leases:        Years ended March 31,(Dollars in millions)2014 2013 2012Allowance for credit losses at beginning of period$ 527 $ 619 $ 879Provision for credit losses  170   121   (98)Charge-offs, net of recoveries  (243)   (213)   (162)Allowance for credit losses at end of period$ 454 $ 527 $ 619                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Allowance for Credit Losses and Finance Receivables by Portfolio Segment               | Fiscal Year Ended March 31, 2014                (Dollars in millions)Retail Loan Commercial Dealer Products Total             Allowance for Credit Losses for Finance Receivables:             Beginning Balance at April 1, 2013$ 333 $ 5 $ 107 $ 445Charge-offs   (263)   (2)   - $ (265)Recoveries   64   1   -   65Provisions   162   (2)   (19)   141Ending Balance at March 31, 2014$ 296 $ 2 $ 88 $ 386             Ending Balance: Individually evaluated for     impairment$ - $ - $ 31 $ 31Ending Balance: Collectively evaluated for     impairment$ 296 $ 2 $ 57 $ 355             Gross Finance Receivables:                        Ending Balance at March 31, 2014$ 49,410 $ 439 $ 15,925 $ 65,774Ending Balance: Individually evaluated for     impairment$ - $ - $ 208 $ 208Ending Balance: Collectively evaluated for     impairment$ 49,410 $ 439 $ 15,717 $ 65,566Fiscal 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 $ 62,931 |
| Past Due Finance Receivables and Investments in Operating Leases                       | Past Due Finance Receivables and Investments in Operating Leases (Dollars in millions)    March 31, 2014March 31, 2013Aggregate balances 60 or more days past due:            Finance receivables      $ 125 $ 119 Operating leases        36   36Total      $ 161 $ 155                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| Past Due Finance Receivables by Class                                                  | (Dollars in millions)30-59 DaysPast Due60-89 DaysPast Due90 Daysor GreaterPast DueTotal PastDueCurrentTotalFinance Receivables90 Days or Greater Past Due and Accruing               As of March 31, 2014                           Retail Loan$ 459$ 90$ 33$ 582$ 48,828$ 49,410$ 33Commercial  6  1  -  7  432  439  -Wholesale  -  -  -  -  9,436  9,436  -Real estate  4  1  -  5  4,653  4,658  -Working capital  -  -  -  -  1,831  1,831  -Total$ 469$ 92$ 33$ 594$ 65,180$ 65,774$ 33                              (Dollars in millions)30-59 DaysPast Due60-89 DaysPast Due90 Daysor GreaterPast DueTotal PastDueCurrentTotalFinance Receivables90 Days or Greater 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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |

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| - 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.
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| 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                                                                                                                                                                                                                                                                                                          |
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| - Definition
Tabular disclosure of the aging of financing receivables by class.
+ References
No definition available.
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| 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=28368275&loc=SL6953423-111524
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| - Details**Name:**us-gaap_LoansAndLeasesReceivableDisclosureAbstract**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |