| **Finance Receivables (Details 6) $ in Millions**                                    | 3 Months Ended | 9 Months Ended |        |
|--------------------------------------------------------------------------------------|----------------|----------------|--------|
||
| **Financing Receivable, Modifications**                                              |           |           |   |   |   |
| Remaining commitments                                                                | $ 0            |           | $ 0    |   | $ 0 |
| **Finance receivables modified as TDRs**                                             |           |           |   |   |   |
| Number of Contracts | contracts                                                      | 8              | 6              | 57     | 43 |   |
| Pre-TDR Recorded Investment                                                          | $ 56           | $ 40           | $ 188  | $ 138 |   |
| Post-TDR Recorded Investment                                                         | $ 55           | $ 40           | $ 181  | $ 105 |   |
| Customer                                                                             |           |           |   |   |   |
| **TDRs which had been modified within twelve months of the default date [Abstract]** |           |           |   |   |   |
| Number of Contracts | contracts                                                      | 0              | 11             | 0      | 16 |   |
| Post-TDR Recorded Investment                                                         | $ 0            | $ 42           | $ 0    | $ 44 |   |
| Customer | North America                                                             |           |           |   |   |   |
| **Finance receivables modified as TDRs**                                             |           |           |   |   |   |
| Number of Contracts | contracts                                                      | 4              | 4              | 12     | 34 |   |
| Pre-TDR Recorded Investment                                                          | $ 0            | $ 0            | $ 5    | $ 13 |   |
| Post-TDR Recorded Investment                                                         | $ 0            | $ 0            | $ 4    | $ 13 |   |
| **TDRs which had been modified within twelve months of the default date [Abstract]** |           |           |   |   |   |
| Number of Contracts | contracts                                                      | 0              | 7              | 0      | 10 |   |
| Post-TDR Recorded Investment                                                         | $ 0            | $ 9            | $ 0    | $ 10 |   |
| Customer | EAME                                                                      |           |           |   |   |   |
| **Finance receivables modified as TDRs**                                             |           |           |   |   |   |
| Number of Contracts | contracts                                                      |           |           | 21     | 0 |   |
| Pre-TDR Recorded Investment                                                          |           |           | $ 21   | $ 0 |   |
| Post-TDR Recorded Investment                                                         |           |           | $ 17   | $ 0 |   |
| Customer | Mining                                                                    |           |           |   |   |   |
| **Finance receivables modified as TDRs**                                             |           |           |   |   |   |
| Number of Contracts | contracts                                                      |           |           | 1      | 1 |   |
| Pre-TDR Recorded Investment                                                          |           |           | $ 6    | $ 29 |   |
| Post-TDR Recorded Investment                                                         |           |           | $ 6    | $ 29 |   |
| Customer | Latin America                                                             |           |           |   |   |   |
| **Finance receivables modified as TDRs**                                             |           |           |   |   |   |
| Number of Contracts | contracts                                                      |           |           | 4      | 1 |   |
| Pre-TDR Recorded Investment                                                          |           |           | $ 2    | $ 3 |   |
| Post-TDR Recorded Investment                                                         |           |           | $ 2    | $ 3 |   |
| **TDRs which had been modified within twelve months of the default date [Abstract]** |           |           |   |   |   |
| Number of Contracts | contracts                                                      | 0              | 1              | 0      | 3 |   |
| Post-TDR Recorded Investment                                                         | $ 0            | $ 0            | $ 0    | $ 1 |   |
| Customer | Caterpillar Power Finance                                                 |           |           |   |   |   |
| **Finance receivables modified as TDRs**                                             |           |           |   |   |   |
| Number of Contracts | contracts                                                      | 4              | 2              | 19     | 7 |   |
| Pre-TDR Recorded Investment                                                          | $ 56           | $ 40           | $ 154  | $ 93 |   |
| Post-TDR Recorded Investment                                                         | $ 55           | $ 40           | $ 152  | $ 60 |   |
| **TDRs which had been modified within twelve months of the default date [Abstract]** |           |           |   |   |   |
| Number of Contracts | contracts                                                      | 0              | 3              | 0      | 3 |   |
| Post-TDR Recorded Investment                                                         | $ 0            | $ 33           | $ 0    | $ 33 |   |
| Dealer                                                                               |           |           |   |   |   |
| **Finance receivables modified as TDRs**                                             |           |           |   |   |   |
| Number of Contracts | contracts                                                      | 0              | 0              | 0      | 0 |   |
| Caterpillar Purchased Receivables                                                    |           |           |   |   |   |
| **Finance receivables modified as TDRs**                                             |           |           |   |   |   |
| Number of Contracts | contracts                                                      | 0              | 0              | 0      | 0 |   |

| X                                                                                                                                                                                                                                                                                         |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Loan and finance lease receivables modified as TDRs
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Loans and leases modified as TDRs within previous twelve months that subsequently defaulted
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                 |
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| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of financing receivables that have been modified by troubled debt restructurings.
+ References
Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, after troubled debt restructuring, of modified financing receivable.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, before troubled debt restructuring, of financing receivable to be modified.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of unfunded portion of contractual agreement to lend funds to borrower for financing receivable modified as troubled debt restructuring.
+ References
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| X                                                                                                                                                           |
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| X                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                       |
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| X                                                                                                                                                                                            |
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| X                                                                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                         |
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| X                                                                                                                                                                                  |
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