| **Finance Receivables (Details 3) - USD ($) $ in Millions** | 6 Months Ended | 12 Months Ended |         |         |
|-------------------------------------------------------------|----------------|-----------------|---------|---------|
||
| **Financing Receivable, Allowance for Credit Losses**       |           |            |    |    |
| Balance at beginning of year                                | $ 424          | $ 511           |    |    |
| Adjustment to adopt new accounting guidance                 | 12             |            |    |    |
| Receivables written off                                     | (73)           | (281)           |    |    |
| Recoveries on receivables previously written off            | 13             | 44              |    |    |
| Provision for credit losses                                 | 145            | 162             |    |    |
| Adjustment due to sale of receivables                       |           | (11)            |    |    |
| Foreign currency translation adjustment                     | (6)            | (1)             |    |    |
| Balance at end of period                                    | 515            | 424             |    |    |
| **Allowance for Credit Losses**                             |           |            |    |    |
| Individually evaluated                                      |           |            | $ 223   | $ 217   |
| Collectively evaluated                                      |           |            | 292     | 207     |
| Allowance, Ending Balance                                   | 515            | 424             | 515     | 424     |
| **Finance Receivables**                                     |           |            |    |    |
| Individually evaluated                                      |           |            | 679     | 672     |
| Collectively evaluated                                      |           |            | 26,177  | 27,584  |
| Finance Receivables, Ending Balance                         |           |            | 26,856  | 28,256  |
| Customer                                                    |           |            |    |    |
| **Financing Receivable, Allowance for Credit Losses**       |           |            |    |    |
| Balance at beginning of year                                | 375            | 486             |    |    |
| Adjustment to adopt new accounting guidance                 | 12             |            |    |    |
| Receivables written off                                     | (73)           | (281)           |    |    |
| Recoveries on receivables previously written off            | 13             | 44              |    |    |
| Provision for credit losses                                 | 146            | 138             |    |    |
| Adjustment due to sale of receivables                       |           | (11)            |    |    |
| Foreign currency translation adjustment                     | (6)            | (1)             |    |    |
| Balance at end of period                                    | 467            | 375             |    |    |
| **Allowance for Credit Losses**                             |           |            |    |    |
| Individually evaluated                                      |           |            | 184     | 178     |
| Collectively evaluated                                      |           |            | 283     | 197     |
| Allowance, Ending Balance                                   | 467            | 375             | 467     | 375     |
| **Finance Receivables**                                     |           |            |    |    |
| Individually evaluated                                      |           |            | 601     | 594     |
| Collectively evaluated                                      |           |            | 18,538  | 18,770  |
| Finance Receivables, Ending Balance                         |           |            | 19,139  | 19,364  |
| Dealer                                                      |           |            |    |    |
| **Financing Receivable, Allowance for Credit Losses**       |           |            |    |    |
| Balance at beginning of year                                | 45             | 21              |    |    |
| Adjustment to adopt new accounting guidance                 | 0              |            |    |    |
| Receivables written off                                     | 0              | 0               |    |    |
| Recoveries on receivables previously written off            | 0              | 0               |    |    |
| Provision for credit losses                                 | 0              | 24              |    |    |
| Adjustment due to sale of receivables                       |           | 0               |    |    |
| Foreign currency translation adjustment                     | 0              | 0               |    |    |
| Balance at end of period                                    | 45             | 45              |    |    |
| **Allowance for Credit Losses**                             |           |            |    |    |
| Individually evaluated                                      |           |            | 39      | 39      |
| Collectively evaluated                                      |           |            | 6       | 6       |
| Allowance, Ending Balance                                   | 45             | 45              | 45      | 45      |
| **Finance Receivables**                                     |           |            |    |    |
| Individually evaluated                                      |           |            | 78      | 78      |
| Collectively evaluated                                      |           |            | 4,125   | 4,366   |
| Finance Receivables, Ending Balance                         |           |            | 4,203   | 4,444   |
| Caterpillar Purchased Receivables                           |           |            |    |    |
| **Financing Receivable, Allowance for Credit Losses**       |           |            |    |    |
| Balance at beginning of year                                | 4              | 4               |    |    |
| Adjustment to adopt new accounting guidance                 | 0              |            |    |    |
| Receivables written off                                     | 0              | 0               |    |    |
| Recoveries on receivables previously written off            | 0              | 0               |    |    |
| Provision for credit losses                                 | (1)            | 0               |    |    |
| Adjustment due to sale of receivables                       |           | 0               |    |    |
| Foreign currency translation adjustment                     | 0              | 0               |    |    |
| Balance at end of period                                    | 3              | 4               |    |    |
| **Allowance for Credit Losses**                             |           |            |    |    |
| Individually evaluated                                      |           |            | 0       | 0       |
| Collectively evaluated                                      |           |            | 3       | 4       |
| Allowance, Ending Balance                                   | $ 3            | $ 4             | 3       | 4       |
| **Finance Receivables**                                     |           |            |    |    |
| Individually evaluated                                      |           |            | 0       | 0       |
| Collectively evaluated                                      |           |            | 3,514   | 4,448   |
| Finance Receivables, Ending Balance                         |           |            | $ 3,514 | $ 4,448 |

| X                                                                                                                                                                                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Adjustment to adopt new accounting guidance related to credit losses
+ References
No definition available.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of gain (loss) from converting allowance reserve for credit loss to currency of reporting entity from amount denominated or measured in a different currency, which decreases (increases) the allowance for loan and lease losses.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of reduction of allowance reserve for credit loss arising from sale of loan and lease portfolios.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.
+ References
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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.
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| - Definition
Amount of recovery of financing receivables doubtful of collection that were previously charged off.
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| - Definition
A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.
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| - Definition
Amount of writeoff of financing receivable, charged against allowance for credit loss.
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| - Definition
The balance of financing receivables that were collectively evaluated for impairment.
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The balance of financing receivables that were individually evaluated for impairment.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.
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| - Definition
Amount of expense related to estimated loss from loan and lease transactions.
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