| **Finance Receivables (Details 5) - USD ($) $ in Millions** | Mar. 31, 2016 | Dec. 31, 2015 |
|-------------------------------------------------------------|---------------|---------------|
| **Financing Receivable, Recorded Investment, Past Due**     |          |          |
| Investment in finance receivables on non-accrual status     | $ 568         | $ 485         |
| Customer | North America                                    |          |          |
| **Financing Receivable, Recorded Investment, Past Due**     |          |          |
| Investment in finance receivables on non-accrual status     | 40            | 31            |
| Customer | Europe                                           |          |          |
| **Financing Receivable, Recorded Investment, Past Due**     |          |          |
| Investment in finance receivables on non-accrual status     | 56            | 39            |
| Customer | Asia/Pacific                                     |          |          |
| **Financing Receivable, Recorded Investment, Past Due**     |          |          |
| Investment in finance receivables on non-accrual status     | 18            | 15            |
| Customer | Mining                                           |          |          |
| **Financing Receivable, Recorded Investment, Past Due**     |          |          |
| Investment in finance receivables on non-accrual status     | 135           | 106           |
| Customer | Latin America                                    |          |          |
| **Financing Receivable, Recorded Investment, Past Due**     |          |          |
| Investment in finance receivables on non-accrual status     | 262           | 217           |
| Customer | Caterpillar Power Finance                        |          |          |
| **Financing Receivable, Recorded Investment, Past Due**     |          |          |
| Investment in finance receivables on non-accrual status     | 57            | 77            |
| Dealer                                                      |          |          |
| **Financing Receivable, Recorded Investment, Past Due**     |          |          |
| Investment in finance receivables on non-accrual status     | 0             | 0             |
| Caterpillar Purchased Receivables | Europe                  |          |          |
| **Financing Receivable, Recorded Investment, Past Due**     |          |          |
| Investment in finance receivables on non-accrual status     | $ 4           | $ 1           |

| 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.
+ Details**Name:**us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Reflects the carrying amount of loans deemed to be questionable as to collection on which interest is continuing to be earned or accrued.
+ References
No definition available.
+ Details**Name:**us-gaap_LoansAndLeasesReceivableImpairedNonperformingAccrualOfInterest**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FinancingReceivablePortfolioSegmentAxis=cfsc_CustomerMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| 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_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:** |