| **Financing Activities (Details 6) (USD $)In Millions, unless otherwise specified** | 3 Months Ended                                                      |                                                    |
|-------------------------------------------------------------------------------------|---------------------------------------------------------------------|----------------------------------------------------|
||
| **Loans Managed, Securitized or Asset-backed Financing Arrangement**                |                                                                |                                               |   |
| Off balance-sheet managed assets                                                    | $ 331us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized |                                               | $ 316us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized |
| Servicing liability                                                                 | 1us-gaap_ServicingLiability                                         |                                               | 1us-gaap_ServicingLiability |
| **Purchase of trade receivables from Caterpillar Entities**                         |                                                                |                                               |   |
| Amortization of receivables purchase discount                                       | $ 58cfsc_AmortizationOfReceivablesPurchaseDiscount                  | $ 58cfsc_AmortizationOfReceivablesPurchaseDiscount |   |

| X                                                                                                                                                                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the revenue recognized in the current period associated with the discount received on purchases of trade receivables from parent entity.
+ References
No definition available.
+ Details**Name:**cfsc_AmortizationOfReceivablesPurchaseDiscount**Namespace Prefix:**cfsc_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**cfsc_PurchasesOfTradeReceivablesFromCaterpillarAbstract**Namespace Prefix:**cfsc_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_LoansManagedOrSecuritizedAbstract**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This is the sum of principal amount outstanding for both securitized and unsecuritized loans of all types.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=13989330&loc=d3e107314-111719
+ Details**Name:**us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Aggregate amount of servicing liabilities that are subsequently measured at fair value and servicing liabilities that are subsequently measured using the amortization method.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745
+ Details**Name:**us-gaap_ServicingLiability**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |