| **Finance Receivables (Details 9) $ in Millions**                                | 3 Months Ended | 9 Months Ended |
|----------------------------------------------------------------------------------|----------------|----------------|
||
| Dealer                                                                           |           |           |
| **Financing Receivable, Modified [Line Items]**                                  |           |           |
| Financing Receivable, Modified in Period, Amount                                 | $ 0            | $ 0            |
| Caterpillar Purchased Receivables                                                |           |           |
| **Financing Receivable, Modified [Line Items]**                                  |           |           |
| Financing Receivable, Modified in Period, Amount                                 | 0              | 0              |
| Customer                                                                         |           |           |
| **Financing Receivable, Modified [Line Items]**                                  |           |           |
| Financing Receivable, Modified in Period, Amount                                 | $ 13           | $ 38           |
| Financing Receivable, Modification To Total Financing Receivables, Percent       | 0.05%          | 0.14%          |
| Financing Receivable, Modified, Weighted Average Term Increase from Modification | 8 months       | 17 months      |
| Financing Receivable, Modified, Weighted Average Payment Delay                   | 6 months       | 7 months       |
| EAME | 31-60 days past due | Customer                                            |           |           |
| **Financing Receivable, Modified [Line Items]**                                  |           |           |
| Financing Receivable, Modified, Accumulated                                      | $ 3            | $ 3            |

| X                                                                                                                                                                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Financing Receivable, Modified, Weighted Average Payment Delay
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of financing receivable modified during period for debtor experiencing financial difficulty to total financing receivables.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amortized cost of financing receivable modified during period for debtor experiencing financial difficulty.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Accumulated amortized cost of financing receivable modified for debtor experiencing financial difficulty.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Period of increase in weighted average maturity of financing receivable modified for debtor experiencing financial difficulty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
+ References
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| X                                                                                                                                                                                  |
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| X                                                                                                                                                           |
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