| **Finance Receivables (Details 4) - USD ($) $ in Millions**                  | 3 Months Ended | 6 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                               | $ 481          |           | $ 481    |   | $ 408 |
| Unpaid Principal Balance With No Allowance Recorded                          | 479            |           | 479      |   | 407 |
| Related Allowance With No Allowance Recorded                                 | 0              |           | 0        |   | 0 |
| Recorded Investment With An Allowance Recorded                               | 195            |           | 195      |   | 193 |
| Unpaid Principal Balance With An Allowance Recorded                          | 192            |           | 192      |   | 191 |
| Related Allowance With An Allowance Recorded                                 | 69             |           | 69       |   | 65 |
| Recorded Investment, Total                                                   | 676            |           | 676      |   | 601 |
| Unpaid Principal Balance, Total                                              | 671            |           | 671      |   | 598 |
| Related Allowance, Total                                                     | 69             |           | 69       |   | 65 |
| Average Recorded Investment With No Allowance Recorded                       | 453            | $ 345          | 435      | $ 329 |   |
| Interest Income Recognized With No Allowance Recorded                        | 3              | 2              | 7        | 5 |   |
| Average Recorded Investment With An Allowance Recorded                       | 188            | 307            | 186      | 300 |   |
| Interest Income Recognized With An Allowance Recorded                        | 2              | 3              | 4        | 5 |   |
| Average Recorded Investment, Total                                           | 641            | 652            | 621      | 629 |   |
| Interest Income Recognized, Total                                            | 5              | 5              | 11       | 10 |   |
| Customer | North America                                                     |           |           |     |   |   |
| **Financing Receivable, Impaired**                                           |           |           |     |   |   |
| Recorded Investment With No Allowance Recorded                               | 33             |           | 33       |   | 12 |
| Unpaid Principal Balance With No Allowance Recorded                          | 33             |           | 33       |   | 12 |
| Related Allowance With No Allowance Recorded                                 | 0              |           | 0        |   | 0 |
| Recorded Investment With An Allowance Recorded                               | 33             |           | 33       |   | 14 |
| Unpaid Principal Balance With An Allowance Recorded                          | 31             |           | 31       |   | 13 |
| Related Allowance With An Allowance Recorded                                 | 11             |           | 11       |   | 4 |
| Recorded Investment, Total                                                   | 66             |           | 66       |   | 26 |
| Unpaid Principal Balance, Total                                              | 64             |           | 64       |   | 25 |
| Related Allowance, Total                                                     | 11             |           | 11       |   | 4 |
| Average Recorded Investment With No Allowance Recorded                       | 24             | 12             | 19       | 13 |   |
| Interest Income Recognized With No Allowance Recorded                        | 1              | 0              | 1        | 0 |   |
| Average Recorded Investment With An Allowance Recorded                       | 25             | 6              | 20       | 6 |   |
| Interest Income Recognized With An Allowance Recorded                        | 0              | 0              | 0        | 0 |   |
| Average Recorded Investment, Total                                           | 49             | 18             | 39       | 19 |   |
| Interest Income Recognized, Total                                            | 1              | 0              | 1        | 0 |   |
| 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                               | 12             |           | 12       |   | 11 |
| Unpaid Principal Balance With An Allowance Recorded                          | 11             |           | 11       |   | 10 |
| Related Allowance With An Allowance Recorded                                 | 7              |           | 7        |   | 5 |
| Recorded Investment, Total                                                   | 61             |           | 61       |   | 52 |
| Unpaid Principal Balance, Total                                              | 59             |           | 59       |   | 51 |
| Related Allowance, Total                                                     | 7              |           | 7        |   | 5 |
| Average Recorded Investment With No Allowance Recorded                       | 44             | 42             | 43       | 43 |   |
| Interest Income Recognized With No Allowance Recorded                        | 0              | 0              | 0        | 0 |   |
| Average Recorded Investment With An Allowance Recorded                       | 12             | 15             | 12       | 14 |   |
| Interest Income Recognized With An Allowance Recorded                        | 0              | 1              | 0        | 1 |   |
| Average Recorded Investment, Total                                           | 56             | 57             | 55       | 57 |   |
| Interest Income Recognized, Total                                            | 0              | 1              | 0        | 1 |   |
| Customer | Asia/Pacific                                                      |           |           |     |   |   |
| **Financing Receivable, Impaired**                                           |           |           |     |   |   |
| Recorded Investment With No Allowance Recorded                               | 0              |           | 0        |   | 1 |
| Unpaid Principal Balance With No Allowance Recorded                          | 0              |           | 0        |   | 1 |
| Related Allowance With No Allowance Recorded                                 | 0              |           | 0        |   | 0 |
| Recorded Investment With An Allowance Recorded                               | 36             |           | 36       |   | 34 |
| Unpaid Principal Balance With An Allowance Recorded                          | 36             |           | 36       |   | 34 |
| Related Allowance With An Allowance Recorded                                 | 5              |           | 5        |   | 4 |
| Recorded Investment, Total                                                   | 36             |           | 36       |   | 35 |
| Unpaid Principal Balance, Total                                              | 36             |           | 36       |   | 35 |
| Related Allowance, Total                                                     | 5              |           | 5        |   | 4 |
| Average Recorded Investment With No Allowance Recorded                       | 3              | 3              | 2        | 3 |   |
| Interest Income Recognized With No Allowance Recorded                        | 0              | 0              | 0        | 0 |   |
| Average Recorded Investment With An Allowance Recorded                       | 36             | 41             | 35       | 34 |   |
| Interest Income Recognized With An Allowance Recorded                        | 1              | 1              | 2        | 1 |   |
| Average Recorded Investment, Total                                           | 39             | 44             | 37       | 37 |   |
| Interest Income Recognized, Total                                            | 1              | 1              | 2        | 1 |   |
| Customer | Mining                                                            |           |           |     |   |   |
| **Financing Receivable, Impaired**                                           |           |           |     |   |   |
| Recorded Investment With No Allowance Recorded                               | 81             |           | 81       |   | 84 |
| Unpaid Principal Balance With No Allowance Recorded                          | 81             |           | 81       |   | 84 |
| Related Allowance With No Allowance Recorded                                 | 0              |           | 0        |   | 0 |
| Recorded Investment With An Allowance Recorded                               | 10             |           | 10       |   | 11 |
| Unpaid Principal Balance With An Allowance Recorded                          | 10             |           | 10       |   | 11 |
| Related Allowance With An Allowance Recorded                                 | 3              |           | 3        |   | 3 |
| Recorded Investment, Total                                                   | 91             |           | 91       |   | 95 |
| Unpaid Principal Balance, Total                                              | 91             |           | 91       |   | 95 |
| Related Allowance, Total                                                     | 3              |           | 3        |   | 3 |
| Average Recorded Investment With No Allowance Recorded                       | 80             | 80             | 80       | 87 |   |
| Interest Income Recognized With No Allowance Recorded                        | 0              | 1              | 1        | 3 |   |
| Average Recorded Investment With An Allowance Recorded                       | 13             | 62             | 12       | 66 |   |
| Interest Income Recognized With An Allowance Recorded                        | 0              | 0              | 0        | 1 |   |
| Average Recorded Investment, Total                                           | 93             | 142            | 92       | 153 |   |
| Interest Income Recognized, Total                                            | 0              | 1              | 1        | 4 |   |
| Customer | Latin America                                                     |           |           |     |   |   |
| **Financing Receivable, Impaired**                                           |           |           |     |   |   |
| Recorded Investment With No Allowance Recorded                               | 38             |           | 38       |   | 28 |
| Unpaid Principal Balance With No Allowance Recorded                          | 38             |           | 38       |   | 28 |
| Related Allowance With No Allowance Recorded                                 | 0              |           | 0        |   | 0 |
| Recorded Investment With An Allowance Recorded                               | 61             |           | 61       |   | 53 |
| Unpaid Principal Balance With An Allowance Recorded                          | 61             |           | 61       |   | 53 |
| Related Allowance With An Allowance Recorded                                 | 27             |           | 27       |   | 21 |
| Recorded Investment, Total                                                   | 99             |           | 99       |   | 81 |
| Unpaid Principal Balance, Total                                              | 99             |           | 99       |   | 81 |
| Related Allowance, Total                                                     | 27             |           | 27       |   | 21 |
| Average Recorded Investment With No Allowance Recorded                       | 29             | 32             | 29       | 32 |   |
| Interest Income Recognized With No Allowance Recorded                        | 0              | 0              | 0        | 0 |   |
| Average Recorded Investment With An Allowance Recorded                       | 57             | 51             | 54       | 49 |   |
| Interest Income Recognized With An Allowance Recorded                        | 0              | 0              | 1        | 1 |   |
| Average Recorded Investment, Total                                           | 86             | 83             | 83       | 81 |   |
| Interest Income Recognized, Total                                            | 0              | 0              | 1        | 1 |   |
| Customer | Caterpillar Power Finance                                         |           |           |     |   |   |
| **Financing Receivable, Impaired**                                           |           |           |     |   |   |
| Recorded Investment With No Allowance Recorded                               | 280            |           | 280      |   | 242 |
| Unpaid Principal Balance With No Allowance Recorded                          | 279            |           | 279      |   | 241 |
| Related Allowance With No Allowance Recorded                                 | 0              |           | 0        |   | 0 |
| Recorded Investment With An Allowance Recorded                               | 43             |           | 43       |   | 70 |
| Unpaid Principal Balance With An Allowance Recorded                          | 43             |           | 43       |   | 70 |
| Related Allowance With An Allowance Recorded                                 | 16             |           | 16       |   | 28 |
| Recorded Investment, Total                                                   | 323            |           | 323      |   | 312 |
| Unpaid Principal Balance, Total                                              | 322            |           | 322      |   | 311 |
| Related Allowance, Total                                                     | 16             |           | 16       |   | 28 |
| Average Recorded Investment With No Allowance Recorded                       | 273            | 176            | 262      | 151 |   |
| Interest Income Recognized With No Allowance Recorded                        | 2              | 1              | 5        | 2 |   |
| Average Recorded Investment With An Allowance Recorded                       | 45             | 132            | 53       | 131 |   |
| Interest Income Recognized With An Allowance Recorded                        | 1              | 1              | 1        | 1 |   |
| Average Recorded Investment, Total                                           | 318            | 308            | 315      | 282 |   |
| Interest Income Recognized, Total                                            | 3              | $ 2            | 6        | $ 3 |   |
| 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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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
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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.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of unpaid principal balance of impaired financing receivables for which there is no related allowance for credit losses.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of average investment of impaired financing receivables for which there is a related allowance for credit losses.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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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