| **Segment Information (Details) - USD ($) $ in Millions** | 3 Months Ended | 9 Months Ended |         |
|-----------------------------------------------------------|----------------|----------------|---------|
||
| **Segment Reporting Information**                         |           |           |    |   |   |
| External Revenues                                         | $ 690          | $ 634          | $ 2,010 | $ 1,919 |   |
| Profit before income taxes                                | 188            | 131            | 580     | 516 |   |
| Interest Expense                                          | 151            | 110            | 377     | 351 |   |
| Depreciation on equipment leased to others                | 179            | 191            | 544     | 570 |   |
| Provision for credit losses                               | (16)           | 59             | 34      | 60 |   |
| Assets                                                    | 31,483         |           | 31,483  |   | $ 32,387 |
| Capital expenditures                                      | 294            | 311            | 869     | 899 |   |
| Operating Segments                                        |           |           |    |   |   |
| **Segment Reporting Information**                         |           |           |    |   |   |
| External Revenues                                         | 683            | 634            | 1,998   | 1,915 |   |
| Profit before income taxes                                | 247            | 160            | 686     | 606 |   |
| Interest Expense                                          | 168            | 116            | 418     | 363 |   |
| Depreciation on equipment leased to others                | 179            | 191            | 544     | 570 |   |
| Provision for credit losses                               | (16)           | 59             | 34      | 60 |   |
| Assets                                                    | 29,273         |           | 29,273  |   | 31,098 |
| Capital expenditures                                      | 292            | 309            | 863     | 893 |   |
| Unallocated                                               |           |           |    |   |   |
| **Segment Reporting Information**                         |           |           |    |   |   |
| External Revenues                                         | 10             | 3              | 21      | 12 |   |
| Profit before income taxes                                | (80)           | (71)           | (222)   | (218) |   |
| Interest Expense                                          | 53             | 43             | 138     | 138 |   |
| Depreciation on equipment leased to others                | 0              | 0              | 0       | 0 |   |
| Provision for credit losses                               | 0              | 0              | 0       | 0 |   |
| Assets                                                    | 1,762          |           | 1,762   |   | 1,458 |
| Capital expenditures                                      | 2              | 2              | 6       | 6 |   |
| Segment Reconciling Items | Timing                        |           |           |    |   |   |
| **Segment Reporting Information**                         |           |           |    |   |   |
| External Revenues                                         | (3)            | (3)            | (9)     | (8) |   |
| Profit before income taxes                                | 0              | 2              | 3       | 5 |   |
| Interest Expense                                          | 0              | 0              | 0       | 0 |   |
| Depreciation on equipment leased to others                | 0              | 0              | 0       | 0 |   |
| Provision for credit losses                               | 0              | 0              | 0       | 0 |   |
| Assets                                                    | 18             |           | 18      |   | 15 |
| Capital expenditures                                      | 0              | 0              | 0       | 0 |   |
| Segment Reconciling Items | Methodology                   |           |           |    |   |   |
| **Segment Reporting Information**                         |           |           |    |   |   |
| External Revenues                                         | 0              | 0              | 0       | 0 |   |
| Profit before income taxes                                | 21             | 40             | 113     | 123 |   |
| Interest Expense                                          | (70)           | (49)           | (179)   | (150) |   |
| Depreciation on equipment leased to others                | 0              | 0              | 0       | 0 |   |
| Provision for credit losses                               | 0              | 0              | 0       | 0 |   |
| Assets                                                    | 582            |           | 582     |   | 18 |
| Capital expenditures                                      | 0              | 0              | 0       | 0 |   |
| Inter-segment Eliminations                                |           |           |    |   |   |
| **Segment Reporting Information**                         |           |           |    |   |   |
| External Revenues                                         | 0              | 0              | 0       | 0 |   |
| Profit before income taxes                                | 0              | 0              | 0       | 0 |   |
| Interest Expense                                          | 0              | 0              | 0       | 0 |   |
| Depreciation on equipment leased to others                | 0              | 0              | 0       | 0 |   |
| Provision for credit losses                               | 0              | 0              | 0       | 0 |   |
| Assets                                                    | (152)          |           | (152)   |   | (202) |
| Capital expenditures                                      | 0              | 0              | 0       | 0 |   |
| North America | Operating Segments                        |           |           |    |   |   |
| **Segment Reporting Information**                         |           |           |    |   |   |
| External Revenues                                         | 383            | 349            | 1,112   | 1,044 |   |
| Profit before income taxes                                | 150            | 94             | 411     | 295 |   |
| Interest Expense                                          | 69             | 62             | 181     | 195 |   |
| Depreciation on equipment leased to others                | 126            | 138            | 381     | 409 |   |
| Provision for credit losses                               | (5)            | 10             | 11      | 14 |   |
| Assets                                                    | 15,014         |           | 15,014  |   | 15,755 |
| Capital expenditures                                      | 205            | 236            | 652     | 680 |   |
| EAME | Operating Segments                                 |           |           |    |   |   |
| **Segment Reporting Information**                         |           |           |    |   |   |
| External Revenues                                         | 72             | 69             | 207     | 204 |   |
| Profit before income taxes                                | 0              | 26             | 5       | 50 |   |
| Interest Expense                                          | 27             | 6              | 45      | 16 |   |
| Depreciation on equipment leased to others                | 13             | 15             | 41      | 45 |   |
| Provision for credit losses                               | 7              | 0              | 49      | 28 |   |
| Assets                                                    | 4,724          |           | 4,724   |   | 5,192 |
| Capital expenditures                                      | 45             | 40             | 101     | 67 |   |
| Asia/Pacific | Operating Segments                         |           |           |    |   |   |
| **Segment Reporting Information**                         |           |           |    |   |   |
| External Revenues                                         | 70             | 78             | 216     | 263 |   |
| Profit before income taxes                                | 33             | 33             | 104     | 133 |   |
| Interest Expense                                          | 19             | 18             | 55      | 66 |   |
| Depreciation on equipment leased to others                | 1              | 1              | 4       | 5 |   |
| Provision for credit losses                               | 1              | 7              | 5       | 7 |   |
| Assets                                                    | 3,705          |           | 3,705   |   | 4,117 |
| Capital expenditures                                      | 3              | 4              | 6       | 9 |   |
| Latin America | Operating Segments                        |           |           |    |   |   |
| **Segment Reporting Information**                         |           |           |    |   |   |
| External Revenues                                         | 75             | 52             | 204     | 149 |   |
| Profit before income taxes                                | 31             | (19)           | 65      | 15 |   |
| Interest Expense                                          | 37             | 19             | 98      | 48 |   |
| Depreciation on equipment leased to others                | 3              | 2              | 7       | 6 |   |
| Provision for credit losses                               | (8)            | 40             | (3)     | 47 |   |
| Assets                                                    | 2,539          |           | 2,539   |   | 2,405 |
| Capital expenditures                                      | 3              | 1              | 21      | 9 |   |
| Mining | Operating Segments                               |           |           |    |   |   |
| **Segment Reporting Information**                         |           |           |    |   |   |
| External Revenues                                         | 72             | 73             | 218     | 215 |   |
| Profit before income taxes                                | 21             | 22             | 66      | 79 |   |
| Interest Expense                                          | 11             | 8              | 29      | 28 |   |
| Depreciation on equipment leased to others                | 35             | 34             | 109     | 103 |   |
| Provision for credit losses                               | (4)            | 2              | (14)    | (17) |   |
| Assets                                                    | 2,553          |           | 2,553   |   | 2,672 |
| Capital expenditures                                      | 36             | 28             | 83      | 128 |   |
| Caterpillar Power Finance | Operating Segments            |           |           |    |   |   |
| **Segment Reporting Information**                         |           |           |    |   |   |
| External Revenues                                         | 11             | 13             | 41      | 40 |   |
| Profit before income taxes                                | 12             | 4              | 35      | 34 |   |
| Interest Expense                                          | 5              | 3              | 10      | 10 |   |
| Depreciation on equipment leased to others                | 1              | 1              | 2       | 2 |   |
| Provision for credit losses                               | (7)            | 0              | (14)    | (19) |   |
| Assets                                                    | 738            |           | 738     |   | $ 957 |
| Capital expenditures                                      | $ 0            | $ 0            | $ 0     | $ 0 |   |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow for purchases on long lived, depreciable tangible personal property, nonconsumable in nature, with finite lives used to generate rental income and the cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.
+ References
No definition available.
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| - Definition
Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of the cost of borrowed funds accounted for as interest expense.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of depreciation expense for lessor's underlying asset for which right to use has been conveyed to lessee under operating lease.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.
+ References
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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).
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