| **Financing Activities (Details) - 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                               | $ 333          |           | $ 333    |   | $ 252 |
| Unpaid Principal Balance With No Allowance Recorded                          | 331            |           | 331      |   | 250 |
| Related Allowance With No Allowance Recorded                                 | 0              |           | 0        |   | 0 |
| Recorded Investment With An Allowance Recorded                               | 232            |           | 232      |   | 362 |
| Unpaid Principal Balance With An Allowance Recorded                          | 230            |           | 230      |   | 360 |
| Related Allowance With An Allowance Recorded                                 | 82             |           | 82       |   | 75 |
| Recorded Investment, Total                                                   | 565            |           | 565      |   | 614 |
| Unpaid Principal Balance, Total                                              | 561            |           | 561      |   | 610 |
| Related Allowance, Total                                                     | 82             |           | 82       |   | 75 |
| Average Recorded Investment With No Allowance Recorded                       | 314            | $ 276          | 326      | $ 358 |   |
| Interest Income Recognized With No Allowance Recorded                        | 2              | 2              | 7        | 9 |   |
| Average Recorded Investment With An Allowance Recorded                       | 291            | 321            | 295      | 242 |   |
| Interest Income Recognized With An Allowance Recorded                        | 3              | 5              | 8        | 9 |   |
| Average Recorded Investment, Total                                           | 605            | 597            | 621      | 600 |   |
| Interest Income Recognized, Total                                            | 5              | 7              | 15       | 18 |   |
| Customer | North America                                                     |           |           |     |   |   |
| **Financing Receivable, Impaired**                                           |           |           |     |   |   |
| Recorded Investment With No Allowance Recorded                               | 10             |           | 10       |   | 14 |
| Unpaid Principal Balance With No Allowance Recorded                          | 10             |           | 10       |   | 14 |
| Related Allowance With No Allowance Recorded                                 | 0              |           | 0        |   | 0 |
| Recorded Investment With An Allowance Recorded                               | 13             |           | 13       |   | 6 |
| Unpaid Principal Balance With An Allowance Recorded                          | 13             |           | 13       |   | 6 |
| Related Allowance With An Allowance Recorded                                 | 3              |           | 3        |   | 1 |
| Recorded Investment, Total                                                   | 23             |           | 23       |   | 20 |
| Unpaid Principal Balance, Total                                              | 23             |           | 23       |   | 20 |
| Related Allowance, Total                                                     | 3              |           | 3        |   | 1 |
| Average Recorded Investment With No Allowance Recorded                       | 10             | 19             | 12       | 22 |   |
| Interest Income Recognized With No Allowance Recorded                        | 1              | 0              | 1        | 1 |   |
| Average Recorded Investment With An Allowance Recorded                       | 10             | 10             | 7        | 10 |   |
| Interest Income Recognized With An Allowance Recorded                        | 0              | 0              | 0        | 0 |   |
| Average Recorded Investment, Total                                           | 20             | 29             | 19       | 32 |   |
| Interest Income Recognized, Total                                            | 1              | 0              | 1        | 1 |   |
| Customer | Europe                                                            |           |           |     |   |   |
| **Financing Receivable, Impaired**                                           |           |           |     |   |   |
| Recorded Investment With No Allowance Recorded                               | 43             |           | 43       |   | 44 |
| Unpaid Principal Balance With No Allowance Recorded                          | 42             |           | 42       |   | 43 |
| Related Allowance With No Allowance Recorded                                 | 0              |           | 0        |   | 0 |
| Recorded Investment With An Allowance Recorded                               | 9              |           | 9        |   | 12 |
| Unpaid Principal Balance With An Allowance Recorded                          | 8              |           | 8        |   | 12 |
| Related Allowance With An Allowance Recorded                                 | 4              |           | 4        |   | 4 |
| Recorded Investment, Total                                                   | 52             |           | 52       |   | 56 |
| Unpaid Principal Balance, Total                                              | 50             |           | 50       |   | 55 |
| Related Allowance, Total                                                     | 4              |           | 4        |   | 4 |
| Average Recorded Investment With No Allowance Recorded                       | 43             | 47             | 43       | 47 |   |
| Interest Income Recognized With No Allowance Recorded                        | 0              | 1              | 0        | 1 |   |
| Average Recorded Investment With An Allowance Recorded                       | 15             | 24             | 15       | 21 |   |
| Interest Income Recognized With An Allowance Recorded                        | 0              | 1              | 1        | 1 |   |
| Average Recorded Investment, Total                                           | 58             | 71             | 58       | 68 |   |
| Interest Income Recognized, Total                                            | 0              | 2              | 1        | 2 |   |
| Customer | Asia/Pacific                                                      |           |           |     |   |   |
| **Financing Receivable, Impaired**                                           |           |           |     |   |   |
| Recorded Investment With No Allowance Recorded                               | 2              |           | 2        |   | 2 |
| Unpaid Principal Balance With No Allowance Recorded                          | 1              |           | 1        |   | 2 |
| Related Allowance With No Allowance Recorded                                 | 0              |           | 0        |   | 0 |
| Recorded Investment With An Allowance Recorded                               | 48             |           | 48       |   | 29 |
| Unpaid Principal Balance With An Allowance Recorded                          | 48             |           | 48       |   | 29 |
| Related Allowance With An Allowance Recorded                                 | 9              |           | 9        |   | 8 |
| Recorded Investment, Total                                                   | 50             |           | 50       |   | 31 |
| Unpaid Principal Balance, Total                                              | 49             |           | 49       |   | 31 |
| Related Allowance, Total                                                     | 9              |           | 9        |   | 8 |
| Average Recorded Investment With No Allowance Recorded                       | 1              | 1              | 2        | 4 |   |
| Interest Income Recognized With No Allowance Recorded                        | 0              | 0              | 0        | 0 |   |
| Average Recorded Investment With An Allowance Recorded                       | 63             | 26             | 42       | 19 |   |
| Interest Income Recognized With An Allowance Recorded                        | 0              | 0              | 1        | 1 |   |
| Average Recorded Investment, Total                                           | 64             | 27             | 44       | 23 |   |
| Interest Income Recognized, Total                                            | 0              | 0              | 1        | 1 |   |
| Customer | Mining                                                            |           |           |     |   |   |
| **Financing Receivable, Impaired**                                           |           |           |     |   |   |
| Recorded Investment With No Allowance Recorded                               | 56             |           | 56       |   | 29 |
| Unpaid Principal Balance With No Allowance Recorded                          | 56             |           | 56       |   | 29 |
| Related Allowance With No Allowance Recorded                                 | 0              |           | 0        |   | 0 |
| Recorded Investment With An Allowance Recorded                               | 13             |           | 13       |   | 138 |
| Unpaid Principal Balance With An Allowance Recorded                          | 13             |           | 13       |   | 137 |
| Related Allowance With An Allowance Recorded                                 | 5              |           | 5        |   | 9 |
| Recorded Investment, Total                                                   | 69             |           | 69       |   | 167 |
| Unpaid Principal Balance, Total                                              | 69             |           | 69       |   | 166 |
| Related Allowance, Total                                                     | 5              |           | 5        |   | 9 |
| Average Recorded Investment With No Allowance Recorded                       | 63             | 29             | 80       | 82 |   |
| Interest Income Recognized With No Allowance Recorded                        | 0              | 0              | 3        | 3 |   |
| Average Recorded Investment With An Allowance Recorded                       | 9              | 127            | 47       | 75 |   |
| Interest Income Recognized With An Allowance Recorded                        | 0              | 2              | 1        | 4 |   |
| Average Recorded Investment, Total                                           | 72             | 156            | 127      | 157 |   |
| Interest Income Recognized, Total                                            | 0              | 2              | 4        | 7 |   |
| Customer | Latin America                                                     |           |           |     |   |   |
| **Financing Receivable, Impaired**                                           |           |           |     |   |   |
| Recorded Investment With No Allowance Recorded                               | 31             |           | 31       |   | 34 |
| Unpaid Principal Balance With No Allowance Recorded                          | 31             |           | 31       |   | 34 |
| Related Allowance With No Allowance Recorded                                 | 0              |           | 0        |   | 0 |
| Recorded Investment With An Allowance Recorded                               | 60             |           | 60       |   | 42 |
| Unpaid Principal Balance With An Allowance Recorded                          | 60             |           | 60       |   | 42 |
| Related Allowance With An Allowance Recorded                                 | 22             |           | 22       |   | 12 |
| Recorded Investment, Total                                                   | 91             |           | 91       |   | 76 |
| Unpaid Principal Balance, Total                                              | 91             |           | 91       |   | 76 |
| Related Allowance, Total                                                     | 22             |           | 22       |   | 12 |
| Average Recorded Investment With No Allowance Recorded                       | 32             | 37             | 32       | 29 |   |
| Interest Income Recognized With No Allowance Recorded                        | 0              | 0              | 0        | 0 |   |
| Average Recorded Investment With An Allowance Recorded                       | 69             | 34             | 56       | 33 |   |
| Interest Income Recognized With An Allowance Recorded                        | 1              | 1              | 2        | 1 |   |
| Average Recorded Investment, Total                                           | 101            | 71             | 88       | 62 |   |
| Interest Income Recognized, Total                                            | 1              | 1              | 2        | 1 |   |
| Customer | Caterpillar Power Finance                                         |           |           |     |   |   |
| **Financing Receivable, Impaired**                                           |           |           |     |   |   |
| Recorded Investment With No Allowance Recorded                               | 191            |           | 191      |   | 129 |
| Unpaid Principal Balance With No Allowance Recorded                          | 191            |           | 191      |   | 128 |
| Related Allowance With No Allowance Recorded                                 | 0              |           | 0        |   | 0 |
| Recorded Investment With An Allowance Recorded                               | 89             |           | 89       |   | 135 |
| Unpaid Principal Balance With An Allowance Recorded                          | 88             |           | 88       |   | 134 |
| Related Allowance With An Allowance Recorded                                 | 39             |           | 39       |   | 41 |
| Recorded Investment, Total                                                   | 280            |           | 280      |   | 264 |
| Unpaid Principal Balance, Total                                              | 279            |           | 279      |   | 262 |
| Related Allowance, Total                                                     | 39             |           | 39       |   | 41 |
| Average Recorded Investment With No Allowance Recorded                       | 165            | 143            | 157      | 174 |   |
| Interest Income Recognized With No Allowance Recorded                        | 1              | 1              | 3        | 4 |   |
| Average Recorded Investment With An Allowance Recorded                       | 125            | 100            | 128      | 84 |   |
| Interest Income Recognized With An Allowance Recorded                        | 2              | 1              | 3        | 2 |   |
| Average Recorded Investment, Total                                           | 290            | 243            | 285      | 258 |   |
| Interest Income Recognized, Total                                            | 3              | 2              | 6        | 6 |   |
| Dealer                                                                       |           |           |     |   |   |
| **Financing Receivable, Impaired**                                           |           |           |     |   |   |
| Recorded Investment, Total                                                   | 0              |           | 0        |   | 0 |
| Average Recorded Investment, Total                                           | 0              | 0              | 0        | 0 |   |
| Caterpillar Purchased Receivables                                            |           |           |     |   |   |
| **Financing Receivable, Impaired**                                           |           |           |     |   |   |
| Recorded Investment, Total                                                   | 0              |           | 0        |   | $ 0 |
| Average Recorded Investment, Total                                           | $ 0            | $ 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.
+ Details**Name:**cfsc_PeriodAfterWhichCollectionOfFutureIncomeIsConsideredAsNotProbable**Namespace Prefix:**cfsc_**Data Type:**xbrli:durationItemType**Balance Type:**na**Period Type:**duration |
| 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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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.
+ References
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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.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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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