| **Financing Activities (Details 5) (USD $)In Millions, unless otherwise specified**                    | 3 Months Ended                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                            |
|--------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
||
| **Finance receivables modified as TDRs**                                                               |                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                       |   |
| Number of Contracts                                                                                    | 5us-gaap_FinancingReceivableModificationsNumberOfContracts2                                                                                                                                                                                                 | 18us-gaap_FinancingReceivableModificationsNumberOfContracts2                                                                                                                                                                                               |   |
| Pre-TDR Recorded Investment                                                                            | $ 84us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2                                                                                                                                                                              | $ 49us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2                                                                                                                                                                             |   |
| Post-TDR Recorded Investment                                                                           | 81us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2                                                                                                                                                                               | 47us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2                                                                                                                                                                              |   |
| **TDRs with a payment default which had been modified within twelve months prior to the default date** |                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                       |   |
| Number of Contracts                                                                                    | 5us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1                                                                                                                                                                                | 14us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1                                                                                                                                                                              |   |
| Post-TDR Recorded Investment                                                                           | 1us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1                                                                                                                                                                               | 2us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1                                                                                                                                                                              |   |
| Customer | North America                                                                               |                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                       |   |
| **Finance receivables modified as TDRs**                                                               |                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                       |   |
| Number of Contracts                                                                                    | 3us-gaap_FinancingReceivableModificationsNumberOfContracts2/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= us-gaap_NorthAmericaMember                           | 3us-gaap_FinancingReceivableModificationsNumberOfContracts2/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= us-gaap_NorthAmericaMember                          |   |
| Pre-TDR Recorded Investment                                                                            | 1us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= us-gaap_NorthAmericaMember           | 2us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= us-gaap_NorthAmericaMember          |   |
| Post-TDR Recorded Investment                                                                           | 1us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= us-gaap_NorthAmericaMember          | 2us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= us-gaap_NorthAmericaMember         |   |
| **TDRs with a payment default which had been modified within twelve months prior to the default date** |                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                       |   |
| Number of Contracts                                                                                    | 4us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= us-gaap_NorthAmericaMember          | 7us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= us-gaap_NorthAmericaMember         |   |
| Post-TDR Recorded Investment                                                                           | 1us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= us-gaap_NorthAmericaMember         | 1us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= us-gaap_NorthAmericaMember        |   |
| Customer | Europe                                                                                      |                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                       |   |
| **Finance receivables modified as TDRs**                                                               |                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                       |   |
| Number of Contracts                                                                                    | 0us-gaap_FinancingReceivableModificationsNumberOfContracts2/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= us-gaap_EMEAMember                                   | 3us-gaap_FinancingReceivableModificationsNumberOfContracts2/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= us-gaap_EMEAMember                                  |   |
| Pre-TDR Recorded Investment                                                                            | 0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= us-gaap_EMEAMember                   | 5us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= us-gaap_EMEAMember                  |   |
| Post-TDR Recorded Investment                                                                           | 0us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= us-gaap_EMEAMember                  | 5us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= us-gaap_EMEAMember                 |   |
| **TDRs with a payment default which had been modified within twelve months prior to the default date** |                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                       |   |
| Number of Contracts                                                                                    | 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= us-gaap_EMEAMember                  | 7us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= us-gaap_EMEAMember                 |   |
| Post-TDR Recorded Investment                                                                           | 0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= us-gaap_EMEAMember                 | 1us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= us-gaap_EMEAMember                |   |
| Customer | Mining                                                                                      |                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                       |   |
| **Finance receivables modified as TDRs**                                                               |                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                       |   |
| Number of Contracts                                                                                    | 0us-gaap_FinancingReceivableModificationsNumberOfContracts2/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= cfsc_MiningMember                                    | 1us-gaap_FinancingReceivableModificationsNumberOfContracts2/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= cfsc_MiningMember                                   |   |
| Pre-TDR Recorded Investment                                                                            | 0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= cfsc_MiningMember                    | 11us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= cfsc_MiningMember                  |   |
| Post-TDR Recorded Investment                                                                           | 0us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= cfsc_MiningMember                   | 10us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= cfsc_MiningMember                 |   |
| Customer | Latin America                                                                               |                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                       |   |
| **Finance receivables modified as TDRs**                                                               |                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                       |   |
| Number of Contracts                                                                                    | 0us-gaap_FinancingReceivableModificationsNumberOfContracts2/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= us-gaap_LatinAmericaMember                           | 10us-gaap_FinancingReceivableModificationsNumberOfContracts2/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= us-gaap_LatinAmericaMember                         |   |
| Pre-TDR Recorded Investment                                                                            | 0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= us-gaap_LatinAmericaMember           | 30us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= us-gaap_LatinAmericaMember         |   |
| Post-TDR Recorded Investment                                                                           | 0us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= us-gaap_LatinAmericaMember          | 29us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= us-gaap_LatinAmericaMember        |   |
| **TDRs with a payment default which had been modified within twelve months prior to the default date** |                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                       |   |
| Number of Contracts                                                                                    | 1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= us-gaap_LatinAmericaMember          | 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= us-gaap_LatinAmericaMember         |   |
| Post-TDR Recorded Investment                                                                           | 0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= us-gaap_LatinAmericaMember         | 0us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= us-gaap_LatinAmericaMember        |   |
| Customer | Caterpillar Power Finance                                                                   |                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                       |   |
| **Finance receivables modified as TDRs**                                                               |                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                       |   |
| Number of Contracts                                                                                    | 2us-gaap_FinancingReceivableModificationsNumberOfContracts2/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= cfsc_CaterpillarPowerFinanceMember                   | 1us-gaap_FinancingReceivableModificationsNumberOfContracts2/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= cfsc_CaterpillarPowerFinanceMember                  |   |
| Pre-TDR Recorded Investment                                                                            | 83us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= cfsc_CaterpillarPowerFinanceMember  | 1us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= cfsc_CaterpillarPowerFinanceMember  |   |
| Post-TDR Recorded Investment                                                                           | 80us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= cfsc_CaterpillarPowerFinanceMember | 1us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= cfsc_CaterpillarPowerFinanceMember |   |
| **TDRs with a payment default which had been modified within twelve months prior to the default date** |                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                       |   |
| Remaining commitments                                                                                  | $ 0us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= cfsc_CaterpillarPowerFinanceMember                   |                                                                                                                                                                                                                                                       | $ 0us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember/ cfsc_ImpairedFinancingReceivableAxis= cfsc_CaterpillarPowerFinanceMember |
| Dealer                                                                                                 |                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                       |   |
| **Finance receivables modified as TDRs**                                                               |                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                       |   |
| Number of Contracts                                                                                    | 0us-gaap_FinancingReceivableModificationsNumberOfContracts2/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_DealerMember                                                                                               | 0us-gaap_FinancingReceivableModificationsNumberOfContracts2/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_DealerMember                                                                                              |   |
| Caterpillar Purchased Receivables                                                                      |                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                       |   |
| **Finance receivables modified as TDRs**                                                               |                                                                                                                                                                                                                                                        |                                                                                                                                                                                                                                                       |   |
| Number of Contracts                                                                                    | 0us-gaap_FinancingReceivableModificationsNumberOfContracts2/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CaterpillarPurchasedReceivablesMember                                                                      | 0us-gaap_FinancingReceivableModificationsNumberOfContracts2/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CaterpillarPurchasedReceivablesMember                                                                     |   |

| X                                                                                                                                                                                  |
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of financing receivables that have been modified by troubled debt restructurings.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Post-modification amount of investment in financing receivables modified by troubled debt restructurings.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953682-111524
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| - Definition
Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953682-111524
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Reflects the unfunded portion of contractual agreements to lend funds to borrowers for loans whose terms have been modified by troubled debt restructuring.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18794-111554
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