| **Financing Activities (Details 4) - USD ($) $ in Millions**                  | Sep. 30, 2015 | Dec. 31, 2014 |
|-------------------------------------------------------------------------------|---------------|---------------|
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | $ 27,591      | $ 29,475      |
| Performing                                                                    |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 26,977        | 29,003        |
| Nonperforming                                                                 |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 614           | 472           |
| North America                                                                 |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 12,833        | 12,526        |
| North America | Performing                                                    |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 12,803        | 12,499        |
| North America | Nonperforming                                                 |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 30            | 27            |
| Europe                                                                        |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 3,237         | 3,581         |
| Europe | Performing                                                           |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 3,185         | 3,549         |
| Europe | Nonperforming                                                        |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 52            | 32            |
| Asia/Pacific                                                                  |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 3,231         | 3,931         |
| Asia/Pacific | Performing                                                     |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 3,206         | 3,877         |
| Asia/Pacific | Nonperforming                                                  |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 25            | 54            |
| Mining                                                                        |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 1,855         | 2,126         |
| Mining | Performing                                                           |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 1,722         | 2,064         |
| Mining | Nonperforming                                                        |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 133           | 62            |
| Latin America                                                                 |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 3,254         | 4,141         |
| Latin America | Performing                                                    |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 2,994         | 3,940         |
| Latin America | Nonperforming                                                 |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 260           | 201           |
| Caterpillar Power Finance                                                     |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 3,181         | 3,170         |
| Caterpillar Power Finance | Performing                                        |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 3,067         | 3,074         |
| Caterpillar Power Finance | Nonperforming                                     |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 114           | 96            |
| Customer                                                                      |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 19,808        | 21,068        |
| Customer | Performing                                                         |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 19,200        | 20,600        |
| Customer | Nonperforming                                                      |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 608           | 468           |
| Customer | North America                                                      |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 7,816         | 7,372         |
| Customer | North America | Performing                                         |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 7,786         | 7,345         |
| Customer | North America | Nonperforming                                      |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 30            | 27            |
| Customer | Europe                                                             |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 2,487         | 2,675         |
| Customer | Europe | Performing                                                |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 2,441         | 2,647         |
| Customer | Europe | Nonperforming                                             |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 46            | 28            |
| Customer | Asia/Pacific                                                       |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 2,278         | 2,893         |
| Customer | Asia/Pacific | Performing                                          |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 2,253         | 2,839         |
| Customer | Asia/Pacific | Nonperforming                                       |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 25            | 54            |
| Customer | Mining                                                             |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 1,848         | 2,123         |
| Customer | Mining | Performing                                                |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 1,715         | 2,061         |
| Customer | Mining | Nonperforming                                             |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 133           | 62            |
| Customer | Latin America                                                      |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 2,207         | 2,857         |
| Customer | Latin America | Performing                                         |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 1,947         | 2,656         |
| Customer | Latin America | Nonperforming                                      |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 260           | 201           |
| Customer | Caterpillar Power Finance                                          |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 3,172         | 3,148         |
| Customer | Caterpillar Power Finance | Performing                             |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 3,058         | 3,052         |
| Customer | Caterpillar Power Finance | Nonperforming                          |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 114           | 96            |
| Dealer                                                                        |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 5,246         | 5,169         |
| Dealer | Performing                                                           |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 5,246         | 5,169         |
| Dealer | Nonperforming                                                        |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 0             | 0             |
| Dealer | North America                                                        |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 3,528         | 3,209         |
| Dealer | North America | Performing                                           |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 3,528         | 3,209         |
| Dealer | North America | Nonperforming                                        |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 0             | 0             |
| Dealer | Europe                                                               |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 400           | 467           |
| Dealer | Europe | Performing                                                  |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 400           | 467           |
| Dealer | Europe | Nonperforming                                               |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 0             | 0             |
| Dealer | Asia/Pacific                                                         |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 584           | 637           |
| Dealer | Asia/Pacific | Performing                                            |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 584           | 637           |
| Dealer | Asia/Pacific | Nonperforming                                         |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 0             | 0             |
| Dealer | Mining                                                               |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 7             | 3             |
| Dealer | Mining | Performing                                                  |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 7             | 3             |
| Dealer | Mining | Nonperforming                                               |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 0             | 0             |
| Dealer | Latin America                                                        |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 724           | 853           |
| Dealer | Latin America | Performing                                           |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 724           | 853           |
| Dealer | Latin America | Nonperforming                                        |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 0             | 0             |
| Dealer | Caterpillar Power Finance                                            |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 3             | 0             |
| Dealer | Caterpillar Power Finance | Performing                               |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 3             | 0             |
| Dealer | Caterpillar Power Finance | Nonperforming                            |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 0             | 0             |
| Caterpillar Purchased Receivables                                             |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 2,537         | 3,238         |
| Caterpillar Purchased Receivables | Performing                                |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 2,531         | 3,234         |
| Caterpillar Purchased Receivables | Nonperforming                             |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 6             | 4             |
| Caterpillar Purchased Receivables | North America                             |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 1,489         | 1,945         |
| Caterpillar Purchased Receivables | North America | Performing                |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 1,489         | 1,945         |
| Caterpillar Purchased Receivables | North America | Nonperforming             |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 0             | 0             |
| Caterpillar Purchased Receivables | Europe                                    |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 350           | 439           |
| Caterpillar Purchased Receivables | Europe | Performing                       |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 344           | 435           |
| Caterpillar Purchased Receivables | Europe | Nonperforming                    |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 6             | 4             |
| Caterpillar Purchased Receivables | Asia/Pacific                              |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 369           | 401           |
| Caterpillar Purchased Receivables | Asia/Pacific | Performing                 |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 369           | 401           |
| Caterpillar Purchased Receivables | Asia/Pacific | Nonperforming              |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 0             | 0             |
| Caterpillar Purchased Receivables | Mining                                    |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 0             | 0             |
| Caterpillar Purchased Receivables | Mining | Performing                       |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 0             | 0             |
| Caterpillar Purchased Receivables | Mining | Nonperforming                    |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 0             | 0             |
| Caterpillar Purchased Receivables | Latin America                             |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 323           | 431           |
| Caterpillar Purchased Receivables | Latin America | Performing                |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 323           | 431           |
| Caterpillar Purchased Receivables | Latin America | Nonperforming             |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 0             | 0             |
| Caterpillar Purchased Receivables | Caterpillar Power Finance                 |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 6             | 22            |
| Caterpillar Purchased Receivables | Caterpillar Power Finance | Performing    |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | 6             | 22            |
| Caterpillar Purchased Receivables | Caterpillar Power Finance | Nonperforming |          |          |
| **Recorded investment in finance receivables**                                |          |          |
| Recorded Investment in Finance Receivables, Ending Balance                    | $ 0           | $ 0           |

| 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
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.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524
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| X                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_NorthAmericaMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_EMEAMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                               |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_AsiaPacificMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=cfsc_MiningMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_LatinAmericaMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=cfsc_CaterpillarPowerFinanceMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FinancingReceivablePortfolioSegmentAxis=cfsc_CustomerMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FinancingReceivablePortfolioSegmentAxis=cfsc_DealerMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FinancingReceivablePortfolioSegmentAxis=cfsc_CaterpillarPurchasedReceivablesMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |