| **Finance Receivables (Details 4) - USD ($) $ in Millions**                  | 3 Months Ended | 9 Months Ended |          |
|------------------------------------------------------------------------------|----------------|----------------|----------|
||
| **Receivables [Abstract]**                                                   |           |           |     |   |   |
| Period after which collection of future income is considered as not probable |           |           | 120 days |   |   |
| Customer                                                                     |           |           |     |   |   |
| **Financing Receivable, Impaired**                                           |           |           |     |   |   |
| Recorded Investment With No Allowance Recorded                               | $ 554          |           | $ 554    |   | $ 408 |
| Unpaid Principal Balance With No Allowance Recorded                          | 551            |           | 551      |   | 407 |
| Related Allowance With No Allowance Recorded                                 | 0              |           | 0        |   | 0 |
| Recorded Investment With An Allowance Recorded                               | 265            |           | 265      |   | 193 |
| Unpaid Principal Balance With An Allowance Recorded                          | 275            |           | 275      |   | 191 |
| Related Allowance With An Allowance Recorded                                 | 85             |           | 85       |   | 65 |
| Recorded Investment, Total                                                   | 819            |           | 819      |   | 601 |
| Unpaid Principal Balance, Total                                              | 826            |           | 826      |   | 598 |
| Related Allowance, Total                                                     | 85             |           | 85       |   | 65 |
| Average Recorded Investment With No Allowance Recorded                       | 504            | $ 314          | 458      | $ 326 |   |
| Interest Income Recognized With No Allowance Recorded                        | 6              | 2              | 13       | 7 |   |
| Average Recorded Investment With An Allowance Recorded                       | 216            | 291            | 197      | 295 |   |
| Interest Income Recognized With An Allowance Recorded                        | 1              | 3              | 5        | 8 |   |
| Average Recorded Investment, Total                                           | 720            | 605            | 655      | 621 |   |
| Interest Income Recognized, Total                                            | 7              | 5              | 18       | 15 |   |
| Customer | North America                                                     |           |           |     |   |   |
| **Financing Receivable, Impaired**                                           |           |           |     |   |   |
| Recorded Investment With No Allowance Recorded                               | 21             |           | 21       |   | 12 |
| Unpaid Principal Balance With No Allowance Recorded                          | 21             |           | 21       |   | 12 |
| Related Allowance With No Allowance Recorded                                 | 0              |           | 0        |   | 0 |
| Recorded Investment With An Allowance Recorded                               | 50             |           | 50       |   | 14 |
| Unpaid Principal Balance With An Allowance Recorded                          | 48             |           | 48       |   | 13 |
| Related Allowance With An Allowance Recorded                                 | 19             |           | 19       |   | 4 |
| Recorded Investment, Total                                                   | 71             |           | 71       |   | 26 |
| Unpaid Principal Balance, Total                                              | 69             |           | 69       |   | 25 |
| Related Allowance, Total                                                     | 19             |           | 19       |   | 4 |
| Average Recorded Investment With No Allowance Recorded                       | 24             | 10             | 19       | 12 |   |
| Interest Income Recognized With No Allowance Recorded                        | 0              | 1              | 1        | 1 |   |
| Average Recorded Investment With An Allowance Recorded                       | 42             | 10             | 28       | 7 |   |
| Interest Income Recognized With An Allowance Recorded                        | 0              | 0              | 0        | 0 |   |
| Average Recorded Investment, Total                                           | 66             | 20             | 47       | 19 |   |
| Interest Income Recognized, Total                                            | 0              | 1              | 1        | 1 |   |
| Customer | Europe                                                            |           |           |     |   |   |
| **Financing Receivable, Impaired**                                           |           |           |     |   |   |
| Recorded Investment With No Allowance Recorded                               | 49             |           | 49       |   | 41 |
| Unpaid Principal Balance With No Allowance Recorded                          | 48             |           | 48       |   | 41 |
| Related Allowance With No Allowance Recorded                                 | 0              |           | 0        |   | 0 |
| Recorded Investment With An Allowance Recorded                               | 9              |           | 9        |   | 11 |
| Unpaid Principal Balance With An Allowance Recorded                          | 9              |           | 9        |   | 10 |
| Related Allowance With An Allowance Recorded                                 | 5              |           | 5        |   | 5 |
| Recorded Investment, Total                                                   | 58             |           | 58       |   | 52 |
| Unpaid Principal Balance, Total                                              | 57             |           | 57       |   | 51 |
| Related Allowance, Total                                                     | 5              |           | 5        |   | 5 |
| Average Recorded Investment With No Allowance Recorded                       | 49             | 43             | 45       | 43 |   |
| Interest Income Recognized With No Allowance Recorded                        | 1              | 0              | 1        | 0 |   |
| Average Recorded Investment With An Allowance Recorded                       | 10             | 15             | 11       | 15 |   |
| Interest Income Recognized With An Allowance Recorded                        | 0              | 0              | 0        | 1 |   |
| Average Recorded Investment, Total                                           | 59             | 58             | 56       | 58 |   |
| Interest Income Recognized, Total                                            | 1              | 0              | 1        | 1 |   |
| Customer | Asia/Pacific                                                      |           |           |     |   |   |
| **Financing Receivable, Impaired**                                           |           |           |     |   |   |
| Recorded Investment With No Allowance Recorded                               | 2              |           | 2        |   | 1 |
| Unpaid Principal Balance With No Allowance Recorded                          | 2              |           | 2        |   | 1 |
| Related Allowance With No Allowance Recorded                                 | 0              |           | 0        |   | 0 |
| Recorded Investment With An Allowance Recorded                               | 33             |           | 33       |   | 34 |
| Unpaid Principal Balance With An Allowance Recorded                          | 33             |           | 33       |   | 34 |
| Related Allowance With An Allowance Recorded                                 | 5              |           | 5        |   | 4 |
| Recorded Investment, Total                                                   | 35             |           | 35       |   | 35 |
| Unpaid Principal Balance, Total                                              | 35             |           | 35       |   | 35 |
| Related Allowance, Total                                                     | 5              |           | 5        |   | 4 |
| Average Recorded Investment With No Allowance Recorded                       | 1              | 1              | 2        | 2 |   |
| Interest Income Recognized With No Allowance Recorded                        | 0              | 0              | 0        | 0 |   |
| Average Recorded Investment With An Allowance Recorded                       | 35             | 63             | 34       | 42 |   |
| Interest Income Recognized With An Allowance Recorded                        | 0              | 0              | 2        | 1 |   |
| Average Recorded Investment, Total                                           | 36             | 64             | 36       | 44 |   |
| Interest Income Recognized, Total                                            | 0              | 0              | 2        | 1 |   |
| Customer | Mining                                                            |           |           |     |   |   |
| **Financing Receivable, Impaired**                                           |           |           |     |   |   |
| Recorded Investment With No Allowance Recorded                               | 119            |           | 119      |   | 84 |
| Unpaid Principal Balance With No Allowance Recorded                          | 118            |           | 118      |   | 84 |
| Related Allowance With No Allowance Recorded                                 | 0              |           | 0        |   | 0 |
| Recorded Investment With An Allowance Recorded                               | 38             |           | 38       |   | 11 |
| Unpaid Principal Balance With An Allowance Recorded                          | 38             |           | 38       |   | 11 |
| Related Allowance With An Allowance Recorded                                 | 6              |           | 6        |   | 3 |
| Recorded Investment, Total                                                   | 157            |           | 157      |   | 95 |
| Unpaid Principal Balance, Total                                              | 156            |           | 156      |   | 95 |
| Related Allowance, Total                                                     | 6              |           | 6        |   | 3 |
| Average Recorded Investment With No Allowance Recorded                       | 90             | 63             | 84       | 80 |   |
| Interest Income Recognized With No Allowance Recorded                        | 2              | 0              | 3        | 3 |   |
| Average Recorded Investment With An Allowance Recorded                       | 19             | 9              | 15       | 47 |   |
| Interest Income Recognized With An Allowance Recorded                        | 0              | 0              | 0        | 1 |   |
| Average Recorded Investment, Total                                           | 109            | 72             | 99       | 127 |   |
| Interest Income Recognized, Total                                            | 2              | 0              | 3        | 4 |   |
| Customer | Latin America                                                     |           |           |     |   |   |
| **Financing Receivable, Impaired**                                           |           |           |     |   |   |
| Recorded Investment With No Allowance Recorded                               | 73             |           | 73       |   | 28 |
| Unpaid Principal Balance With No Allowance Recorded                          | 73             |           | 73       |   | 28 |
| Related Allowance With No Allowance Recorded                                 | 0              |           | 0        |   | 0 |
| Recorded Investment With An Allowance Recorded                               | 91             |           | 91       |   | 53 |
| Unpaid Principal Balance With An Allowance Recorded                          | 103            |           | 103      |   | 53 |
| Related Allowance With An Allowance Recorded                                 | 33             |           | 33       |   | 21 |
| Recorded Investment, Total                                                   | 164            |           | 164      |   | 81 |
| Unpaid Principal Balance, Total                                              | 176            |           | 176      |   | 81 |
| Related Allowance, Total                                                     | 33             |           | 33       |   | 21 |
| Average Recorded Investment With No Allowance Recorded                       | 58             | 32             | 39       | 32 |   |
| Interest Income Recognized With No Allowance Recorded                        | 0              | 0              | 0        | 0 |   |
| Average Recorded Investment With An Allowance Recorded                       | 67             | 69             | 59       | 56 |   |
| Interest Income Recognized With An Allowance Recorded                        | 1              | 1              | 2        | 2 |   |
| Average Recorded Investment, Total                                           | 125            | 101            | 98       | 88 |   |
| Interest Income Recognized, Total                                            | 1              | 1              | 2        | 2 |   |
| Customer | Caterpillar Power Finance                                         |           |           |     |   |   |
| **Financing Receivable, Impaired**                                           |           |           |     |   |   |
| Recorded Investment With No Allowance Recorded                               | 290            |           | 290      |   | 242 |
| Unpaid Principal Balance With No Allowance Recorded                          | 289            |           | 289      |   | 241 |
| Related Allowance With No Allowance Recorded                                 | 0              |           | 0        |   | 0 |
| Recorded Investment With An Allowance Recorded                               | 44             |           | 44       |   | 70 |
| Unpaid Principal Balance With An Allowance Recorded                          | 44             |           | 44       |   | 70 |
| Related Allowance With An Allowance Recorded                                 | 17             |           | 17       |   | 28 |
| Recorded Investment, Total                                                   | 334            |           | 334      |   | 312 |
| Unpaid Principal Balance, Total                                              | 333            |           | 333      |   | 311 |
| Related Allowance, Total                                                     | 17             |           | 17       |   | 28 |
| Average Recorded Investment With No Allowance Recorded                       | 282            | 165            | 269      | 157 |   |
| Interest Income Recognized With No Allowance Recorded                        | 3              | 1              | 8        | 3 |   |
| Average Recorded Investment With An Allowance Recorded                       | 43             | 125            | 50       | 128 |   |
| Interest Income Recognized With An Allowance Recorded                        | 0              | 2              | 1        | 3 |   |
| Average Recorded Investment, Total                                           | 325            | 290            | 319      | 285 |   |
| Interest Income Recognized, Total                                            | 3              | $ 3            | 9        | $ 6 |   |
| Dealer                                                                       |           |           |     |   |   |
| **Financing Receivable, Impaired**                                           |           |           |     |   |   |
| Recorded Investment, Total                                                   | 0              |           | 0        |   | 0 |
| Caterpillar Purchased Receivables                                            |           |           |     |   |   |
| **Financing Receivable, Impaired**                                           |           |           |     |   |   |
| Recorded Investment, Total                                                   | $ 0            |           | $ 0      |   | $ 0 |

| X                                                                                                                                                                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of allowance for credit losses related to recorded investment.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the period after which collection of future income is considered as not probable.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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
Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.
+ References
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| - Definition
Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of allowance for credit losses related to recorded investment.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of average investment of impaired financing receivables for which there is no related allowance for credit losses.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of interest income, recognized on cash basis, on financing receivables, for which there is no related allowance for credit losses and are recognized as impaired.
+ References
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| - Definition
Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.
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| - Definition
Amount of unpaid principal balance of impaired financing receivables for which there is no related allowance for credit losses.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of average investment of impaired financing receivables for which there is a related allowance for credit losses.
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| - Definition
Amount of interest income on financing receivables, for which there is a related allowance for credit losses, recognized on a cash-basis method of accounting that the financing receivables were impaired.
+ References
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| - Definition
Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.
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| - Definition
Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses.
+ References
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| X                                                                                                                                                                                             |
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| - References
No definition available.
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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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| X                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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