| **Segment and Geographic Information (Details 2) - USD ($) $ in Millions**             | 3 Months Ended | 12 Months Ended |
|----------------------------------------------------------------------------------------|----------------|-----------------|
||
| **Revenues from External Customers and Long-Lived Assets**                             |           |            |   |   |   |   |   |   |   |   |   |
| External Revenues                                                                      | $ 642          | $ 651           | $ 659 | $ 643 | $ 648 | $ 653 | $ 683 | $ 689 | $ 2,595 | $ 2,673 | $ 2,885 |
| Equipment on Operating Leases and Non-Leased Equipment (included in Other Assets), net | 3,770          |            |   |   | 3,628 |   |   |   | 3,770 | 3,628 |   |
| Inside U.S.                                                                            |           |            |   |   |   |   |   |   |   |   |   |
| **Revenues from External Customers and Long-Lived Assets**                             |           |            |   |   |   |   |   |   |   |   |   |
| External Revenues                                                                      |           |            |   |   |   |   |   |   | 1,397 | 1,330 | 1,219 |
| Equipment on Operating Leases and Non-Leased Equipment (included in Other Assets), net | 2,401          |            |   |   | 2,058 |   |   |   | 2,401 | 2,058 |   |
| Inside Canada                                                                          |           |            |   |   |   |   |   |   |   |   |   |
| **Revenues from External Customers and Long-Lived Assets**                             |           |            |   |   |   |   |   |   |   |   |   |
| External Revenues                                                                      |           |            |   |   |   |   |   |   | 171 | 198 | 259 |
| Equipment on Operating Leases and Non-Leased Equipment (included in Other Assets), net | 535            |            |   |   | 572 |   |   |   | 535 | 572 |   |
| Inside Australia                                                                       |           |            |   |   |   |   |   |   |   |   |   |
| **Revenues from External Customers and Long-Lived Assets**                             |           |            |   |   |   |   |   |   |   |   |   |
| External Revenues                                                                      |           |            |   |   |   |   |   |   | 176 | 200 | 261 |
| Equipment on Operating Leases and Non-Leased Equipment (included in Other Assets), net | 250            |            |   |   | 282 |   |   |   | 250 | 282 |   |
| All other                                                                              |           |            |   |   |   |   |   |   |   |   |   |
| **Revenues from External Customers and Long-Lived Assets**                             |           |            |   |   |   |   |   |   |   |   |   |
| External Revenues                                                                      |           |            |   |   |   |   |   |   | 851 | 945 | $ 1,146 |
| Equipment on Operating Leases and Non-Leased Equipment (included in Other Assets), net | $ 584          |            |   |   | $ 716 |   |   |   | $ 584 | $ 716 |   |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of property, by major property class, net of accumulated depreciation, subject to or available for leases as of the balance sheet date.  Also, includes property on non-leased equipment included in Other Assets.
+ References
No definition available.
+ Details**Name:**cfsc_EquipmentOnOperatingLeasesAndNonLeasedEquipmentNet**Namespace Prefix:**cfsc_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The aggregate financial services revenue and operating interest income earned during the reporting period.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688
+ Details**Name:**us-gaap_FinancialServicesRevenue**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
+ Details**Name:**us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                    |
|--------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_StatementGeographicalAxis=country_US**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                    |
|--------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_StatementGeographicalAxis=country_CA**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                    |
|--------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_StatementGeographicalAxis=country_AU**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_StatementGeographicalAxis=cfsc_AllOtherMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |