| **Financing Activities (Details 3) (USD $)In Millions, unless otherwise specified**                | 6 Months Ended | 12 Months Ended |
|----------------------------------------------------------------------------------------------------|----------------|-----------------|
||
| **Financing Receivable, Allowance for Credit Losses [Roll Forward]**                               |           |            |
| Balance at beginning of period                                                                     | $ 369          | $ 363           |
| Receivables written off                                                                            | (50)           | (210)           |
| Recoveries on receivables previously written off                                                   | 23             | 52              |
| Provision for credit losses                                                                        | 53             | 170             |
| Adjustment due to sale of receivables                                                              | (1)            | (3)             |
| Foreign currency translation adjustment                                                            | (1)            | (3)             |
| Balance at end of period                                                                           | 393            | 369             |
| Allowance, Ending Balance - Individually evaluated for impairment                                  | 61             | 56              |
| Allowance, Ending Balance - Collectively evaluated for impairment                                  | 332            | 313             |
| Allowance, Ending Balance                                                                          | 393            | 369             |
| Recorded Investment in Finance Receivables, Ending Balance - Individually evaluated for impairment | 632            | 575             |
| Recorded Investment in Finance Receivables, Ending Balance - Collectively evaluated for impairment | 26,084         | 24,550          |
| Recorded Investment in Finance Receivables, Ending Balance                                         | 26,716         | 25,125          |
| Customer                                                                                           |           |            |
| **Financing Receivable, Allowance for Credit Losses [Roll Forward]**                               |           |            |
| Balance at beginning of period                                                                     | 360            | 357             |
| Receivables written off                                                                            | (50)           | (210)           |
| Recoveries on receivables previously written off                                                   | 23             | 52              |
| Provision for credit losses                                                                        | 51             | 167             |
| Adjustment due to sale of receivables                                                              | (1)            | (3)             |
| Foreign currency translation adjustment                                                            | (1)            | (3)             |
| Balance at end of period                                                                           | 382            | 360             |
| Allowance, Ending Balance - Individually evaluated for impairment                                  | 61             | 56              |
| Allowance, Ending Balance - Collectively evaluated for impairment                                  | 321            | 304             |
| Allowance, Ending Balance                                                                          | 382            | 360             |
| Recorded Investment in Finance Receivables, Ending Balance - Individually evaluated for impairment | 632            | 575             |
| Recorded Investment in Finance Receivables, Ending Balance - Collectively evaluated for impairment | 18,239         | 17,423          |
| Recorded Investment in Finance Receivables, Ending Balance                                         | 18,871         | 17,998          |
| Dealer                                                                                             |           |            |
| **Financing Receivable, Allowance for Credit Losses [Roll Forward]**                               |           |            |
| Balance at beginning of period                                                                     | 6              | 5               |
| Receivables written off                                                                            | 0              | 0               |
| Recoveries on receivables previously written off                                                   | 0              | 0               |
| Provision for credit losses                                                                        | 2              | 1               |
| Adjustment due to sale of receivables                                                              | 0              | 0               |
| Foreign currency translation adjustment                                                            | 0              | 0               |
| Balance at end of period                                                                           | 8              | 6               |
| Allowance, Ending Balance - Individually evaluated for impairment                                  | 0              | 0               |
| Allowance, Ending Balance - Collectively evaluated for impairment                                  | 8              | 6               |
| Allowance, Ending Balance                                                                          | 8              | 6               |
| Recorded Investment in Finance Receivables, Ending Balance - Individually evaluated for impairment | 0              | 0               |
| Recorded Investment in Finance Receivables, Ending Balance - Collectively evaluated for impairment | 4,719          | 3,973           |
| Recorded Investment in Finance Receivables, Ending Balance                                         | 4,719          | 3,973           |
| Caterpillar Purchased Receivables                                                                  |           |            |
| **Financing Receivable, Allowance for Credit Losses [Roll Forward]**                               |           |            |
| Balance at beginning of period                                                                     | 3              | 1               |
| Receivables written off                                                                            | 0              | 0               |
| Recoveries on receivables previously written off                                                   | 0              | 0               |
| Provision for credit losses                                                                        | 0              | 2               |
| Adjustment due to sale of receivables                                                              | 0              | 0               |
| Foreign currency translation adjustment                                                            | 0              | 0               |
| Balance at end of period                                                                           | 3              | 3               |
| Allowance, Ending Balance - Individually evaluated for impairment                                  | 0              | 0               |
| Allowance, Ending Balance - Collectively evaluated for impairment                                  | 3              | 3               |
| Allowance, Ending Balance                                                                          | 3              | 3               |
| Recorded Investment in Finance Receivables, Ending Balance - Individually evaluated for impairment | 0              | 0               |
| Recorded Investment in Finance Receivables, Ending Balance - Collectively evaluated for impairment | 3,126          | 3,154           |
| Recorded Investment in Finance Receivables, Ending Balance                                         | $ 3,126        | $ 3,154         |

| X                                                                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Reduction to the allowance for credit losses related to adjustments due to sale of receivables.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Reduction to the allowance for credit losses related to foreign currency translation adjustment.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of the recorded investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, accounts receivable (with terms exceeding one year), notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Receivable -URI http://asc.fasb.org/extlink&oid=6953735
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
A valuation allowance for financing receivables that are expected to be uncollectible.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=6965416&loc=SL6953423-111524 -Subparagraph (c)(1)
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=6965416&loc=SL6953423-111524 -Subparagraph (g)
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=6965416&loc=SL6953423-111524 -Subparagraph (g)
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Charge to expense for financing receivables that are expected to be uncollectible.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=6965416&loc=SL6953423-111524 -Subparagraph (c)(2)
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Reduction to the allowance for credit losses related to collections on financing receivables which have been partially or fully charged off as bad debts.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=6965416&loc=SL6953423-111524 -Subparagraph (c)(4)
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| X                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Reduction to the allowance for credit losses related to financing receivables deemed uncollectible.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=6965416&loc=SL6953423-111524 -Subparagraph (c)(3)
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The balance of financing receivables that were collectively evaluated for impairment.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=6965416&loc=SL6953423-111524 -Subparagraph (h)
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The balance of financing receivables that were individually evaluated for impairment.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=6965416&loc=SL6953423-111524 -Subparagraph (h)
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