| **Segment Information (Details 2) (USD $)In Millions, unless otherwise specified** | 3 Months Ended | 12 Months Ended |
|------------------------------------------------------------------------------------|----------------|-----------------|
||
| **Revenues from External Customers and Long-Lived Assets**                         |           |            |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Revenues                                                                           | $ 679          | $ 678           | $ 668 | $ 668 | $ 662 | $ 668 | $ 675 | $ 640 | $ 633 | $ 640 | $ 648 | $ 631 | $ 2,693 | $ 2,645 | $ 2,552 |
| Equipment on operating leases and non-leased equipment, net                        | 3,063          |            |   |   | 2,663 |   |   |   | 2,772 |   |   |   | 3,063 | 2,663 | 2,772 |
| Inside U.S.                                                                        |           |            |   |   |   |   |   |   |   |   |   |   |   |   |   |
| **Revenues from External Customers and Long-Lived Assets**                         |           |            |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Revenues                                                                           |           |            |   |   |   |   |   |   |   |   |   |   | 1,142 | 1,112 | 1,138 |
| Equipment on operating leases and non-leased equipment, net                        | 1,218          |            |   |   | 986 |   |   |   | 1,044 |   |   |   | 1,218 | 986 | 1,044 |
| Inside Canada                                                                      |           |            |   |   |   |   |   |   |   |   |   |   |   |   |   |
| **Revenues from External Customers and Long-Lived Assets**                         |           |            |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Revenues                                                                           |           |            |   |   |   |   |   |   |   |   |   |   | 347 | 374 | 362 |
| Equipment on operating leases and non-leased equipment, net                        | 761            |            |   |   | 771 |   |   |   | 818 |   |   |   | 761 | 771 | 818 |
| Inside Australia                                                                   |           |            |   |   |   |   |   |   |   |   |   |   |   |   |   |
| **Revenues from External Customers and Long-Lived Assets**                         |           |            |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Revenues                                                                           |           |            |   |   |   |   |   |   |   |   |   |   | 301 | 259 | 222 |
| Equipment on operating leases and non-leased equipment, net                        | 342            |            |   |   | 314 |   |   |   | 343 |   |   |   | 342 | 314 | 343 |
| All other                                                                          |           |            |   |   |   |   |   |   |   |   |   |   |   |   |   |
| **Revenues from External Customers and Long-Lived Assets**                         |           |            |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Revenues                                                                           |           |            |   |   |   |   |   |   |   |   |   |   | 903 | 900 | 830 |
| Equipment on operating leases and non-leased equipment, net                        | $ 742          |            |   |   | $ 592 |   |   |   | $ 567 |   |   |   | $ 742 | $ 592 | $ 567 |

| 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=6880815&loc=d3e20235-122688Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5
+ Details**Name:**us-gaap_FinancialServicesRevenue**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |