| **Financing Activities (Details 3) (USD $)In Millions, unless otherwise specified** | 3 Months Ended                                                                                                                                                                                                     | 12 Months Ended                                                                                                                                                                                                    |
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||
| **Financing Receivable, Allowance for Credit Losses**                               |                                                                                                                                                                                                               |                                                                                                                                                                                                               |
| Balance at beginning of year                                                        | $ 401us-gaap_FinancingReceivableAllowanceForCreditLosses                                                                                                                                                           | $ 387us-gaap_FinancingReceivableAllowanceForCreditLosses                                                                                                                                                           |
| Receivables written off                                                             | (23)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs                                                                                                                                                   | (146)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs                                                                                                                                                  |
| Recoveries on receivables previously written off                                    | 11us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery                                                                                                                                                      | 47us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery                                                                                                                                                      |
| Provision for credit losses                                                         | 17us-gaap_ProvisionForLoanAndLeaseLosses                                                                                                                                                                           | 136us-gaap_ProvisionForLoanAndLeaseLosses                                                                                                                                                                          |
| Adjustment due to sale of receivables                                               | 0us-gaap_AllowanceForLoanAndLeaseLossesLoansSold                                                                                                                                                                   | (3)us-gaap_AllowanceForLoanAndLeaseLossesLoansSold                                                                                                                                                                 |
| Foreign currency translation adjustment                                             | (14)us-gaap_AllowanceForLoanAndLeaseLossesForeignCurrencyTranslation                                                                                                                                               | (20)us-gaap_AllowanceForLoanAndLeaseLossesForeignCurrencyTranslation                                                                                                                                               |
| Balance at end of period                                                            | 392us-gaap_FinancingReceivableAllowanceForCreditLosses                                                                                                                                                             | 401us-gaap_FinancingReceivableAllowanceForCreditLosses                                                                                                                                                             |
| **Allowance for Credit Losses**                                                     |                                                                                                                                                                                                               |                                                                                                                                                                                                               |
| Individually evaluated for impairment                                               | 74us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1                                                                                                                           | 75us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1                                                                                                                           |
| Collectively evaluated for impairment                                               | 318us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment                                                                                                                           | 326us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment                                                                                                                           |
| Allowance, Ending Balance                                                           | 392us-gaap_FinancingReceivableAllowanceForCreditLosses                                                                                                                                                             | 401us-gaap_FinancingReceivableAllowanceForCreditLosses                                                                                                                                                             |
| **Recorded Investment in Finance Receivables**                                      |                                                                                                                                                                                                               |                                                                                                                                                                                                               |
| Individually evaluated for impairment                                               | 664us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment                                                                                                                                                   | 614us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment                                                                                                                                                   |
| Collectively evaluated for impairment                                               | 27,745us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment                                                                                                                                                | 28,861us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment                                                                                                                                                |
| Recorded Investment in Finance Receivables, Ending Balance                          | 28,409us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome                                                                                                                                                          | 29,475us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome                                                                                                                                                          |
| Customer                                                                            |                                                                                                                                                                                                               |                                                                                                                                                                                                               |
| **Financing Receivable, Allowance for Credit Losses**                               |                                                                                                                                                                                                               |                                                                                                                                                                                                               |
| Balance at beginning of year                                                        | 388us-gaap_FinancingReceivableAllowanceForCreditLosses/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember                                                         | 374us-gaap_FinancingReceivableAllowanceForCreditLosses/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember                                                         |
| Receivables written off                                                             | (23)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember                                               | (146)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember                                              |
| Recoveries on receivables previously written off                                    | 11us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember                                                  | 47us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember                                                  |
| Provision for credit losses                                                         | 18us-gaap_ProvisionForLoanAndLeaseLosses/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember                                                                       | 136us-gaap_ProvisionForLoanAndLeaseLosses/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember                                                                      |
| Adjustment due to sale of receivables                                               | 0us-gaap_AllowanceForLoanAndLeaseLossesLoansSold/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember                                                               | (3)us-gaap_AllowanceForLoanAndLeaseLossesLoansSold/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember                                                             |
| Foreign currency translation adjustment                                             | (14)us-gaap_AllowanceForLoanAndLeaseLossesForeignCurrencyTranslation/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember                                           | (20)us-gaap_AllowanceForLoanAndLeaseLossesForeignCurrencyTranslation/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember                                           |
| Balance at end of period                                                            | 380us-gaap_FinancingReceivableAllowanceForCreditLosses/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember                                                         | 388us-gaap_FinancingReceivableAllowanceForCreditLosses/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember                                                         |
| **Allowance for Credit Losses**                                                     |                                                                                                                                                                                                               |                                                                                                                                                                                                               |
| Individually evaluated for impairment                                               | 74us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember                       | 75us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember                       |
| Collectively evaluated for impairment                                               | 306us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember                       | 313us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember                       |
| Allowance, Ending Balance                                                           | 380us-gaap_FinancingReceivableAllowanceForCreditLosses/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember                                                         | 388us-gaap_FinancingReceivableAllowanceForCreditLosses/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember                                                         |
| **Recorded Investment in Finance Receivables**                                      |                                                                                                                                                                                                               |                                                                                                                                                                                                               |
| Individually evaluated for impairment                                               | 664us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember                                               | 614us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember                                               |
| Collectively evaluated for impairment                                               | 19,532us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember                                            | 20,454us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember                                            |
| Recorded Investment in Finance Receivables, Ending Balance                          | 20,196us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember                                                      | 21,068us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CustomerMember                                                      |
| Dealer                                                                              |                                                                                                                                                                                                               |                                                                                                                                                                                                               |
| **Financing Receivable, Allowance for Credit Losses**                               |                                                                                                                                                                                                               |                                                                                                                                                                                                               |
| Balance at beginning of year                                                        | 10us-gaap_FinancingReceivableAllowanceForCreditLosses/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_DealerMember                                                            | 10us-gaap_FinancingReceivableAllowanceForCreditLosses/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_DealerMember                                                            |
| Receivables written off                                                             | 0us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_DealerMember                                                    | 0us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_DealerMember                                                    |
| Recoveries on receivables previously written off                                    | 0us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_DealerMember                                                     | 0us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_DealerMember                                                     |
| Provision for credit losses                                                         | (1)us-gaap_ProvisionForLoanAndLeaseLosses/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_DealerMember                                                                        | 0us-gaap_ProvisionForLoanAndLeaseLosses/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_DealerMember                                                                          |
| Adjustment due to sale of receivables                                               | 0us-gaap_AllowanceForLoanAndLeaseLossesLoansSold/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_DealerMember                                                                 | 0us-gaap_AllowanceForLoanAndLeaseLossesLoansSold/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_DealerMember                                                                 |
| Foreign currency translation adjustment                                             | 0us-gaap_AllowanceForLoanAndLeaseLossesForeignCurrencyTranslation/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_DealerMember                                                | 0us-gaap_AllowanceForLoanAndLeaseLossesForeignCurrencyTranslation/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_DealerMember                                                |
| Balance at end of period                                                            | 9us-gaap_FinancingReceivableAllowanceForCreditLosses/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_DealerMember                                                             | 10us-gaap_FinancingReceivableAllowanceForCreditLosses/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_DealerMember                                                            |
| **Allowance for Credit Losses**                                                     |                                                                                                                                                                                                               |                                                                                                                                                                                                               |
| Individually evaluated for impairment                                               | 0us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_DealerMember                          | 0us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_DealerMember                          |
| Collectively evaluated for impairment                                               | 9us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_DealerMember                           | 10us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_DealerMember                          |
| Allowance, Ending Balance                                                           | 9us-gaap_FinancingReceivableAllowanceForCreditLosses/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_DealerMember                                                             | 10us-gaap_FinancingReceivableAllowanceForCreditLosses/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_DealerMember                                                            |
| **Recorded Investment in Finance Receivables**                                      |                                                                                                                                                                                                               |                                                                                                                                                                                                               |
| Individually evaluated for impairment                                               | 0us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_DealerMember                                                   | 0us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_DealerMember                                                   |
| Collectively evaluated for impairment                                               | 5,130us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_DealerMember                                               | 5,169us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_DealerMember                                               |
| Recorded Investment in Finance Receivables, Ending Balance                          | 5,130us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_DealerMember                                                         | 5,169us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_DealerMember                                                         |
| Caterpillar Purchased Receivables                                                   |                                                                                                                                                                                                               |                                                                                                                                                                                                               |
| **Financing Receivable, Allowance for Credit Losses**                               |                                                                                                                                                                                                               |                                                                                                                                                                                                               |
| Balance at beginning of year                                                        | 3us-gaap_FinancingReceivableAllowanceForCreditLosses/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CaterpillarPurchasedReceivablesMember                                    | 3us-gaap_FinancingReceivableAllowanceForCreditLosses/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CaterpillarPurchasedReceivablesMember                                    |
| Receivables written off                                                             | 0us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CaterpillarPurchasedReceivablesMember                           | 0us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CaterpillarPurchasedReceivablesMember                           |
| Recoveries on receivables previously written off                                    | 0us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CaterpillarPurchasedReceivablesMember                            | 0us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CaterpillarPurchasedReceivablesMember                            |
| Provision for credit losses                                                         | 0us-gaap_ProvisionForLoanAndLeaseLosses/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CaterpillarPurchasedReceivablesMember                                                 | 0us-gaap_ProvisionForLoanAndLeaseLosses/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CaterpillarPurchasedReceivablesMember                                                 |
| Adjustment due to sale of receivables                                               | 0us-gaap_AllowanceForLoanAndLeaseLossesLoansSold/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CaterpillarPurchasedReceivablesMember                                        | 0us-gaap_AllowanceForLoanAndLeaseLossesLoansSold/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CaterpillarPurchasedReceivablesMember                                        |
| Foreign currency translation adjustment                                             | 0us-gaap_AllowanceForLoanAndLeaseLossesForeignCurrencyTranslation/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CaterpillarPurchasedReceivablesMember                       | 0us-gaap_AllowanceForLoanAndLeaseLossesForeignCurrencyTranslation/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CaterpillarPurchasedReceivablesMember                       |
| Balance at end of period                                                            | 3us-gaap_FinancingReceivableAllowanceForCreditLosses/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CaterpillarPurchasedReceivablesMember                                    | 3us-gaap_FinancingReceivableAllowanceForCreditLosses/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CaterpillarPurchasedReceivablesMember                                    |
| **Allowance for Credit Losses**                                                     |                                                                                                                                                                                                               |                                                                                                                                                                                                               |
| Individually evaluated for impairment                                               | 0us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CaterpillarPurchasedReceivablesMember | 0us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CaterpillarPurchasedReceivablesMember |
| Collectively evaluated for impairment                                               | 3us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CaterpillarPurchasedReceivablesMember  | 3us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CaterpillarPurchasedReceivablesMember  |
| Allowance, Ending Balance                                                           | 3us-gaap_FinancingReceivableAllowanceForCreditLosses/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CaterpillarPurchasedReceivablesMember                                    | 3us-gaap_FinancingReceivableAllowanceForCreditLosses/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CaterpillarPurchasedReceivablesMember                                    |
| **Recorded Investment in Finance Receivables**                                      |                                                                                                                                                                                                               |                                                                                                                                                                                                               |
| Individually evaluated for impairment                                               | 0us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CaterpillarPurchasedReceivablesMember                          | 0us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CaterpillarPurchasedReceivablesMember                          |
| Collectively evaluated for impairment                                               | 3,083us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CaterpillarPurchasedReceivablesMember                      | 3,238us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CaterpillarPurchasedReceivablesMember                      |
| Recorded Investment in Finance Receivables, Ending Balance                          | $ 3,083us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CaterpillarPurchasedReceivablesMember                              | $ 3,238us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis= cfsc_CaterpillarPurchasedReceivablesMember                              |

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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of gain (loss) from converting allowance reserve for credit loss to currency of reporting entity from amount denominated or measured in a different currency.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Foreign Currency Translation -URI http://asc.fasb.org/extlink&oid=6513664Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of reduction of allowance reserve for credit loss arising from sale of loan and lease portfolios.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9
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| - 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 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of 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 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of recovery of financing receivables doubtful of collection that were previously charged off.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of direct write-downs of financing receivables charged against the allowance.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The balance of financing receivables that were collectively evaluated for impairment.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The balance of financing receivables that were individually evaluated for impairment.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of expense related to estimated loss from loan and lease transactions.
+ References
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