| **Financing Activities (Details 6) - USD ($) $ in Millions**         | 3 Months Ended | 9 Months Ended |        |
|----------------------------------------------------------------------|----------------|----------------|--------|
||
| **Loans Managed, Securitized or Asset-backed Financing Arrangement** |           |           |   |   |   |
| Off balance-sheet managed assets                                     | $ 308          |           | $ 308  |   | $ 316 |
| Servicing liability                                                  | 2              |           | 2      |   | $ 1 |
| **Purchase of trade receivables from Caterpillar Entities**          |           |           |   |   |   |
| Amortization of receivables purchase discount                        | $ 53           | $ 60           | $ 169  | $ 183 |   |

| 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                                                                                                                                                                                                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Purchases of trade receivables from parent entity [Abstract]
+ References
No definition available.
+ Details**Name:**cfsc_PurchasesOfTradeReceivablesFromCaterpillarAbstract**Namespace Prefix:**cfsc_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - References
No definition available.
+ 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=51814546&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 |