| **Allowance for Credit Losses (Past Dues) (Details) (USD $)In Millions, unless otherwise specified**              | Dec. 31, 2013 | Mar. 31, 2013 |
|-------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Past Due Finance Receivables and Investments in Operating Leases**                                              |          |          |  |
| Finance receivables                                                                                               | $ 178         | $ 119         |  |
| Operating leases                                                                                                  | 47            | 36            |  |
| Total                                                                                                             | 225           | 155           |  |
| **Financing Receivable, Recorded Investment, Past Due [Line Items]**                                              |          |          |  |
| 30-59 Days Past Due                                                                                               | 642           | 460           |  |
| 60-89 Days Past Due                                                                                               | 131           | 88            |  |
| 90 Days or Greater Past Due                                                                                       | 47            | 31            |  |
| Total Past Due                                                                                                    | 820           | 579           |  |
| Current                                                                                                           | 65,911        | 62,593        |  |
| Total Finance Receivables                                                                                         | 66,731        | 63,172        |  |
| 90 Days or Greater Past Due and Accruing                                                                          | 47            | 31            |  |
| Retail Loan [Member]                                                                                              |          |          |  |
| **Financing Receivable, Recorded Investment, Past Due [Line Items]**                                              |          |          |  |
| 30-59 Days Past Due                                                                                               | 634           | 454           |  |
| 60-89 Days Past Due                                                                                               | 130           | 87            |  |
| 90 Days or Greater Past Due                                                                                       | 47            | 31            |  |
| Total Past Due                                                                                                    | 811           | 572           |  |
| Current                                                                                                           | 48,908        | 47,236        |  |
| Total Finance Receivables                                                                                         | 49,719        | 47,808        |  |
| 90 Days or Greater Past Due and Accruing                                                                          | 47            | 31            |  |
| Commercial [Member]                                                                                               |          |          |  |
| **Financing Receivable, Recorded Investment, Past Due [Line Items]**                                              |          |          |  |
| 30-59 Days Past Due                                                                                               | 8             | 6             |  |
| 60-89 Days Past Due                                                                                               | 1             | 1             |  |
| 90 Days or Greater Past Due                                                                                       | 0             | 0             |  |
| Total Past Due                                                                                                    | 9             | 7             |  |
| Current                                                                                                           | 413           | 362           |  |
| Total Finance Receivables                                                                                         | 422           | 369           |  |
| 90 Days or Greater Past Due and Accruing                                                                          | 0             | 0             |  |
| Wholesale [Member]                                                                                                |          |          |  |
| **Financing Receivable, Recorded Investment, Past Due [Line Items]**                                              |          |          |  |
| 30-59 Days Past Due                                                                                               | 0             | 0             |  |
| 60-89 Days Past Due                                                                                               | 0             | 0             |  |
| 90 Days or Greater Past Due                                                                                       | 0             | 0             |  |
| Total Past Due                                                                                                    | 0             | 0             |  |
| Current                                                                                                           | 10,069        | 8,689         |  |
| Total Finance Receivables                                                                                         | 10,069        | 8,689         | [1] |
| 90 Days or Greater Past Due and Accruing                                                                          | 0             | 0             |  |
| Real estate [Member]                                                                                              |          |          |  |
| **Financing Receivable, Recorded Investment, Past Due [Line Items]**                                              |          |          |  |
| 30-59 Days Past Due                                                                                               | 0             | 0             |  |
| 60-89 Days Past Due                                                                                               | 0             | 0             |  |
| 90 Days or Greater Past Due                                                                                       | 0             | 0             |  |
| Total Past Due                                                                                                    | 0             | 0             |  |
| Current                                                                                                           | 4,647         | 4,580         |  |
| Total Finance Receivables                                                                                         | 4,647         | 4,580         |  |
| 90 Days or Greater Past Due and Accruing                                                                          | 0             | 0             |  |
| Working capital [Member]                                                                                          |          |          |  |
| **Financing Receivable, Recorded Investment, Past Due [Line Items]**                                              |          |          |  |
| 30-59 Days Past Due                                                                                               | 0             | 0             |  |
| 60-89 Days Past Due                                                                                               | 0             | 0             |  |
| 90 Days or Greater Past Due                                                                                       | 0             | 0             |  |
| Total Past Due                                                                                                    | 0             | 0             |  |
| Current                                                                                                           | 1,874         | 1,726         |  |
| Total Finance Receivables                                                                                         | 1,874         | 1,726         |  |
| 90 Days or Greater Past Due and Accruing                                                                          | $ 0           | $ 0           |  |
|                                                                                                                   |
| [1]  Certain prior period amounts have been reclassified to conform to the current period presentation. |

| X                                                                                                                                                                                                                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Aggregate amount of financing and leases receivables that are equal to or greater than 60 days past due.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Financing receivables that are equal to or greater than 60 days past due.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Leases receivables that are equal to or greater than 60 days past due.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Financing receivables that are less than 60 days past due but more than 29 days past due.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953401-111524
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Financing receivables that are less than 90 days past due but more than 59 days past due.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Recorded investment in financing receivables that are 90 days or more past due and still accruing.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Financing receivables that are current.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Financing receivables that are equal to or greater than 90 days past due.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Recorded Investment in financing receivables that are past due at the balance sheet date.
+ References
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| X                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                         |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale.
+ References
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