| **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                               | $ 446          |           | $ 446    |   | $ 530 |
| Unpaid Principal Balance With No Allowance Recorded                          | 448            |           | 448      |   | 528 |
| Related Allowance With No Allowance Recorded                                 | 0              |           | 0        |   | 0 |
| Recorded Investment With An Allowance Recorded                               | 452            |           | 452      |   | 256 |
| Unpaid Principal Balance With An Allowance Recorded                          | 461            |           | 461      |   | 265 |
| Related Allowance With An Allowance Recorded                                 | 113            |           | 113      |   | 85 |
| Recorded Investment, Total                                                   | 898            |           | 898      |   | 786 |
| Unpaid Principal Balance, Total                                              | 909            |           | 909      |   | 793 |
| Related Allowance, Total                                                     | 113            |           | 113      |   | 85 |
| Average Recorded Investment With No Allowance Recorded                       | 543            | $ 453          | 534      | $ 435 |   |
| Interest Income Recognized With No Allowance Recorded                        | 8              | 3              | 13       | 7 |   |
| Average Recorded Investment With An Allowance Recorded                       | 319            | 188            | 297      | 186 |   |
| Interest Income Recognized With An Allowance Recorded                        | 2              | 2              | 5        | 4 |   |
| Average Recorded Investment, Total                                           | 862            | 641            | 831      | 621 |   |
| Interest Income Recognized, Total                                            | 10             | 5              | 18       | 11 |   |
| Customer | North America                                                     |           |           |     |   |   |
| **Financing Receivable, Impaired**                                           |           |           |     |   |   |
| Recorded Investment With No Allowance Recorded                               | 13             |           | 13       |   | 10 |
| Unpaid Principal Balance With No Allowance Recorded                          | 13             |           | 13       |   | 10 |
| Related Allowance With No Allowance Recorded                                 | 0              |           | 0        |   | 0 |
| Recorded Investment With An Allowance Recorded                               | 49             |           | 49       |   | 61 |
| Unpaid Principal Balance With An Allowance Recorded                          | 48             |           | 48       |   | 60 |
| Related Allowance With An Allowance Recorded                                 | 20             |           | 20       |   | 22 |
| Recorded Investment, Total                                                   | 62             |           | 62       |   | 71 |
| Unpaid Principal Balance, Total                                              | 61             |           | 61       |   | 70 |
| Related Allowance, Total                                                     | 20             |           | 20       |   | 22 |
| Average Recorded Investment With No Allowance Recorded                       | 11             | 24             | 11       | 19 |   |
| Interest Income Recognized With No Allowance Recorded                        | 0              | 1              | 0        | 1 |   |
| Average Recorded Investment With An Allowance Recorded                       | 52             | 25             | 56       | 20 |   |
| Interest Income Recognized With An Allowance Recorded                        | 1              | 0              | 1        | 0 |   |
| Average Recorded Investment, Total                                           | 63             | 49             | 67       | 39 |   |
| Interest Income Recognized, Total                                            | 1              | 1              | 1        | 1 |   |
| Customer | Europe                                                            |           |           |     |   |   |
| **Financing Receivable, Impaired**                                           |           |           |     |   |   |
| Recorded Investment With No Allowance Recorded                               | 48             |           | 48       |   | 49 |
| Unpaid Principal Balance With No Allowance Recorded                          | 47             |           | 47       |   | 48 |
| Related Allowance With No Allowance Recorded                                 | 0              |           | 0        |   | 0 |
| Recorded Investment With An Allowance Recorded                               | 4              |           | 4        |   | 7 |
| Unpaid Principal Balance With An Allowance Recorded                          | 4              |           | 4        |   | 7 |
| Related Allowance With An Allowance Recorded                                 | 2              |           | 2        |   | 3 |
| Recorded Investment, Total                                                   | 52             |           | 52       |   | 56 |
| Unpaid Principal Balance, Total                                              | 51             |           | 51       |   | 55 |
| Related Allowance, Total                                                     | 2              |           | 2        |   | 3 |
| Average Recorded Investment With No Allowance Recorded                       | 48             | 44             | 48       | 43 |   |
| Interest Income Recognized With No Allowance Recorded                        | 1              | 0              | 1        | 0 |   |
| Average Recorded Investment With An Allowance Recorded                       | 5              | 12             | 6        | 12 |   |
| Interest Income Recognized With An Allowance Recorded                        | 0              | 0              | 0        | 0 |   |
| Average Recorded Investment, Total                                           | 53             | 56             | 54       | 55 |   |
| Interest Income Recognized, Total                                            | 1              | 0              | 1        | 0 |   |
| Customer | Asia/Pacific                                                      |           |           |     |   |   |
| **Financing Receivable, Impaired**                                           |           |           |     |   |   |
| Recorded Investment With No Allowance Recorded                               | 29             |           | 29       |   | 3 |
| Unpaid Principal Balance With No Allowance Recorded                          | 29             |           | 29       |   | 2 |
| Related Allowance With No Allowance Recorded                                 | 0              |           | 0        |   | 0 |
| Recorded Investment With An Allowance Recorded                               | 29             |           | 29       |   | 50 |
| Unpaid Principal Balance With An Allowance Recorded                          | 29             |           | 29       |   | 50 |
| Related Allowance With An Allowance Recorded                                 | 3              |           | 3        |   | 8 |
| Recorded Investment, Total                                                   | 58             |           | 58       |   | 53 |
| Unpaid Principal Balance, Total                                              | 58             |           | 58       |   | 52 |
| Related Allowance, Total                                                     | 3              |           | 3        |   | 8 |
| Average Recorded Investment With No Allowance Recorded                       | 30             | 3              | 18       | 2 |   |
| Interest Income Recognized With No Allowance Recorded                        | 1              | 0              | 1        | 0 |   |
| Average Recorded Investment With An Allowance Recorded                       | 30             | 36             | 38       | 35 |   |
| Interest Income Recognized With An Allowance Recorded                        | 0              | 1              | 1        | 2 |   |
| Average Recorded Investment, Total                                           | 60             | 39             | 56       | 37 |   |
| Interest Income Recognized, Total                                            | 1              | 1              | 2        | 2 |   |
| Customer | Mining                                                            |           |           |     |   |   |
| **Financing Receivable, Impaired**                                           |           |           |     |   |   |
| Recorded Investment With No Allowance Recorded                               | 130            |           | 130      |   | 129 |
| Unpaid Principal Balance With No Allowance Recorded                          | 130            |           | 130      |   | 129 |
| Related Allowance With No Allowance Recorded                                 | 0              |           | 0        |   | 0 |
| Recorded Investment With An Allowance Recorded                               | 0              |           | 0        |   | 0 |
| Unpaid Principal Balance With An Allowance Recorded                          | 0              |           | 0        |   | 0 |
| Related Allowance With An Allowance Recorded                                 | 0              |           | 0        |   | 0 |
| Recorded Investment, Total                                                   | 130            |           | 130      |   | 129 |
| Unpaid Principal Balance, Total                                              | 130            |           | 130      |   | 129 |
| Related Allowance, Total                                                     | 0              |           | 0        |   | 0 |
| Average Recorded Investment With No Allowance Recorded                       | 130            | 80             | 129      | 80 |   |
| Interest Income Recognized With No Allowance Recorded                        | 3              | 0              | 4        | 1 |   |
| Average Recorded Investment With An Allowance Recorded                       | 0              | 13             | 0        | 12 |   |
| Interest Income Recognized With An Allowance Recorded                        | 0              | 0              | 0        | 0 |   |
| Average Recorded Investment, Total                                           | 130            | 93             | 129      | 92 |   |
| Interest Income Recognized, Total                                            | 3              | 0              | 4        | 1 |   |
| Customer | Latin America                                                     |           |           |     |   |   |
| **Financing Receivable, Impaired**                                           |           |           |     |   |   |
| Recorded Investment With No Allowance Recorded                               | 68             |           | 68       |   | 68 |
| Unpaid Principal Balance With No Allowance Recorded                          | 67             |           | 67       |   | 68 |
| Related Allowance With No Allowance Recorded                                 | 0              |           | 0        |   | 0 |
| Recorded Investment With An Allowance Recorded                               | 107            |           | 107      |   | 93 |
| Unpaid Principal Balance With An Allowance Recorded                          | 119            |           | 119      |   | 104 |
| Related Allowance With An Allowance Recorded                                 | 43             |           | 43       |   | 34 |
| Recorded Investment, Total                                                   | 175            |           | 175      |   | 161 |
| Unpaid Principal Balance, Total                                              | 186            |           | 186      |   | 172 |
| Related Allowance, Total                                                     | 43             |           | 43       |   | 34 |
| Average Recorded Investment With No Allowance Recorded                       | 67             | 29             | 70       | 29 |   |
| Interest Income Recognized With No Allowance Recorded                        | 0              | 0              | 1        | 0 |   |
| Average Recorded Investment With An Allowance Recorded                       | 107            | 57             | 101      | 54 |   |
| Interest Income Recognized With An Allowance Recorded                        | 1              | 0              | 2        | 1 |   |
| Average Recorded Investment, Total                                           | 174            | 86             | 171      | 83 |   |
| Interest Income Recognized, Total                                            | 1              | 0              | 3        | 1 |   |
| Customer | Caterpillar Power Finance                                         |           |           |     |   |   |
| **Financing Receivable, Impaired**                                           |           |           |     |   |   |
| Recorded Investment With No Allowance Recorded                               | 158            |           | 158      |   | 271 |
| Unpaid Principal Balance With No Allowance Recorded                          | 162            |           | 162      |   | 271 |
| Related Allowance With No Allowance Recorded                                 | 0              |           | 0        |   | 0 |
| Recorded Investment With An Allowance Recorded                               | 263            |           | 263      |   | 45 |
| Unpaid Principal Balance With An Allowance Recorded                          | 261            |           | 261      |   | 44 |
| Related Allowance With An Allowance Recorded                                 | 45             |           | 45       |   | 18 |
| Recorded Investment, Total                                                   | 421            |           | 421      |   | 316 |
| Unpaid Principal Balance, Total                                              | 423            |           | 423      |   | 315 |
| Related Allowance, Total                                                     | 45             |           | 45       |   | 18 |
| Average Recorded Investment With No Allowance Recorded                       | 257            | 273            | 258      | 262 |   |
| Interest Income Recognized With No Allowance Recorded                        | 3              | 2              | 6        | 5 |   |
| Average Recorded Investment With An Allowance Recorded                       | 125            | 45             | 96       | 53 |   |
| Interest Income Recognized With An Allowance Recorded                        | 0              | 1              | 1        | 1 |   |
| Average Recorded Investment, Total                                           | 382            | 318            | 354      | 315 |   |
| Interest Income Recognized, Total                                            | 3              | $ 3            | 7        | $ 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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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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.
+ 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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