| **Segment Information (Details) (USD $)In Millions, unless otherwise specified** | 3 Months Ended | 12 Months Ended |
|----------------------------------------------------------------------------------|----------------|-----------------|
||
| **Segment Reporting Information**                                                |           |            |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Revenues                                                                         | $ 711          | $ 698           | $ 694 | $ 680 | $ 679 | $ 678 | $ 668 | $ 668 | $ 662 | $ 668 | $ 675 | $ 640 | $ 2,783 | $ 2,693 | $ 2,645 |
| Segment Profit                                                                   | 208            | 165             | 158 | 187 | 124 | 153 | 144 | 170 | 111 | 126 | 152 | 115 | 718 | 591 | 504 |
| Interest Expense                                                                 |           |            |   |   |   |   |   |   |   |   |   |   | 734 | 801 | 827 |
| Depreciation on equipment leased to others                                       |           |            |   |   |   |   |   |   |   |   |   |   | 768 | 688 | 690 |
| Provision for credit losses                                                      |           |            |   |   |   |   |   |   |   |   |   |   | 94 | 161 | 176 |
| Segment Assets                                                                   | 35,138         |            |   |   | 34,742 |   |   |   | 30,112 |   |   |   | 35,138 | 34,742 | 30,112 |
| Capital expenditures                                                             |           |            |   |   |   |   |   |   |   |   |   |   | 1,806 | 1,660 | 1,190 |
| Operating Segments                                                               |           |            |   |   |   |   |   |   |   |   |   |   |   |   |   |
| **Segment Reporting Information**                                                |           |            |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Revenues                                                                         |           |            |   |   |   |   |   |   |   |   |   |   | 2,736 | 2,644 | 2,594 |
| Segment Profit                                                                   |           |            |   |   |   |   |   |   |   |   |   |   | 777 | 650 | 554 |
| Interest Expense                                                                 |           |            |   |   |   |   |   |   |   |   |   |   | 720 | 790 | 815 |
| Depreciation on equipment leased to others                                       |           |            |   |   |   |   |   |   |   |   |   |   | 767 | 687 | 688 |
| Provision for credit losses                                                      |           |            |   |   |   |   |   |   |   |   |   |   | 96 | 157 | 187 |
| Segment Assets                                                                   | 33,892         |            |   |   | 33,426 |   |   |   | 29,024 |   |   |   | 33,892 | 33,426 | 29,024 |
| Capital expenditures                                                             |           |            |   |   |   |   |   |   |   |   |   |   | 1,803 | 1,658 | 1,186 |
| Unallocated                                                                      |           |            |   |   |   |   |   |   |   |   |   |   |   |   |   |
| **Segment Reporting Information**                                                |           |            |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Revenues                                                                         |           |            |   |   |   |   |   |   |   |   |   |   | 73 | 73 | 73 |
| Segment Profit                                                                   |           |            |   |   |   |   |   |   |   |   |   |   | (73) | (93) | (92) |
| Interest Expense                                                                 |           |            |   |   |   |   |   |   |   |   |   |   | 53 | 61 | 69 |
| Depreciation on equipment leased to others                                       |           |            |   |   |   |   |   |   |   |   |   |   | 1 | 1 | 2 |
| Provision for credit losses                                                      |           |            |   |   |   |   |   |   |   |   |   |   | 2 | 1 | 2 |
| Segment Assets                                                                   | 1,595          |            |   |   | 1,529 |   |   |   | 1,253 |   |   |   | 1,595 | 1,529 | 1,253 |
| Capital expenditures                                                             |           |            |   |   |   |   |   |   |   |   |   |   | 1 | 0 | 3 |
| Timing                                                                           |           |            |   |   |   |   |   |   |   |   |   |   |   |   |   |
| **Segment Reporting Information**                                                |           |            |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Revenues                                                                         |           |            |   |   |   |   |   |   |   |   |   |   | (26) | (24) | (22) |
| Segment Profit                                                                   |           |            |   |   |   |   |   |   |   |   |   |   | (10) | (6) | 6 |
| Interest Expense                                                                 |           |            |   |   |   |   |   |   |   |   |   |   | 0 | 0 | 0 |
| Depreciation on equipment leased to others                                       |           |            |   |   |   |   |   |   |   |   |   |   | 0 | 0 | 0 |
| Provision for credit losses                                                      |           |            |   |   |   |   |   |   |   |   |   |   | (4) | 3 | (13) |
| Segment Assets                                                                   | 68             |            |   |   | 17 |   |   |   | 67 |   |   |   | 68 | 17 | 67 |
| Capital expenditures                                                             |           |            |   |   |   |   |   |   |   |   |   |   | 2 | 2 | 1 |
| Methodology                                                                      |           |            |   |   |   |   |   |   |   |   |   |   |   |   |   |
| **Segment Reporting Information**                                                |           |            |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Revenues                                                                         |           |            |   |   |   |   |   |   |   |   |   |   | 0 | 0 | 0 |
| Segment Profit                                                                   |           |            |   |   |   |   |   |   |   |   |   |   | 24 | 40 | 36 |
| Interest Expense                                                                 |           |            |   |   |   |   |   |   |   |   |   |   | (39) | (50) | (57) |
| Depreciation on equipment leased to others                                       |           |            |   |   |   |   |   |   |   |   |   |   | 0 | 0 | 0 |
| Provision for credit losses                                                      |           |            |   |   |   |   |   |   |   |   |   |   | 0 | 0 | 0 |
| Segment Assets                                                                   | (190)          |            |   |   | (61) |   |   |   | 15 |   |   |   | (190) | (61) | 15 |
| Capital expenditures                                                             |           |            |   |   |   |   |   |   |   |   |   |   | 0 | 0 | 0 |
| Intersegment Eliminations                                                        |           |            |   |   |   |   |   |   |   |   |   |   |   |   |   |
| **Segment Reporting Information**                                                |           |            |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Revenues                                                                         |           |            |   |   |   |   |   |   |   |   |   |   | 0 | 0 | 0 |
| Segment Profit                                                                   |           |            |   |   |   |   |   |   |   |   |   |   | 0 | 0 | 0 |
| Interest Expense                                                                 |           |            |   |   |   |   |   |   |   |   |   |   | 0 | 0 | 0 |
| Depreciation on equipment leased to others                                       |           |            |   |   |   |   |   |   |   |   |   |   | 0 | 0 | 0 |
| Provision for credit losses                                                      |           |            |   |   |   |   |   |   |   |   |   |   | 0 | 0 | 0 |
| Segment Assets                                                                   | (227)          |            |   |   | (169) |   |   |   | (247) |   |   |   | (227) | (169) | (247) |
| Capital expenditures                                                             |           |            |   |   |   |   |   |   |   |   |   |   | 0 | 0 | 0 |
| North America | Operating Segments                                               |           |            |   |   |   |   |   |   |   |   |   |   |   |   |   |
| **Segment Reporting Information**                                                |           |            |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Revenues                                                                         |           |            |   |   |   |   |   |   |   |   |   |   | 946 | 938 | 959 |
| Segment Profit                                                                   |           |            |   |   |   |   |   |   |   |   |   |   | 286 | 263 | 222 |
| Interest Expense                                                                 |           |            |   |   |   |   |   |   |   |   |   |   | 259 | 270 | 303 |
| Depreciation on equipment leased to others                                       |           |            |   |   |   |   |   |   |   |   |   |   | 293 | 274 | 276 |
| Provision for credit losses                                                      |           |            |   |   |   |   |   |   |   |   |   |   | 0 | 15 | 34 |
| Segment Assets                                                                   | 12,158         |            |   |   | 11,305 |   |   |   | 10,867 |   |   |   | 12,158 | 11,305 | 10,867 |
| Capital expenditures                                                             |           |            |   |   |   |   |   |   |   |   |   |   | 782 | 565 | 530 |
| Europe and CPF | Operating Segments                                              |           |            |   |   |   |   |   |   |   |   |   |   |   |   |   |
| **Segment Reporting Information**                                                |           |            |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Revenues                                                                         |           |            |   |   |   |   |   |   |   |   |   |   | 505 | 467 | 506 |
| Segment Profit                                                                   |           |            |   |   |   |   |   |   |   |   |   |   | 146 | 84 | 37 |
| Interest Expense                                                                 |           |            |   |   |   |   |   |   |   |   |   |   | 110 | 134 | 166 |
| Depreciation on equipment leased to others                                       |           |            |   |   |   |   |   |   |   |   |   |   | 86 | 76 | 89 |
| Provision for credit losses                                                      |           |            |   |   |   |   |   |   |   |   |   |   | 47 | 65 | 105 |
| Segment Assets                                                                   | 8,068          |            |   |   | 7,785 |   |   |   | 6,922 |   |   |   | 8,068 | 7,785 | 6,922 |
| Capital expenditures                                                             |           |            |   |   |   |   |   |   |   |   |   |   | 242 | 243 | 118 |
| Asia/Pacific | Operating Segments                                                |           |            |   |   |   |   |   |   |   |   |   |   |   |   |   |
| **Segment Reporting Information**                                                |           |            |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Revenues                                                                         |           |            |   |   |   |   |   |   |   |   |   |   | 399 | 399 | 333 |
| Segment Profit                                                                   |           |            |   |   |   |   |   |   |   |   |   |   | 168 | 132 | 112 |
| Interest Expense                                                                 |           |            |   |   |   |   |   |   |   |   |   |   | 135 | 155 | 129 |
| Depreciation on equipment leased to others                                       |           |            |   |   |   |   |   |   |   |   |   |   | 25 | 23 | 16 |
| Provision for credit losses                                                      |           |            |   |   |   |   |   |   |   |   |   |   | 5 | 24 | 28 |
| Segment Assets                                                                   | 5,272          |            |   |   | 6,151 |   |   |   | 4,605 |   |   |   | 5,272 | 6,151 | 4,605 |
| Capital expenditures                                                             |           |            |   |   |   |   |   |   |   |   |   |   | 54 | 133 | 42 |
| Latin America | Operating Segments                                               |           |            |   |   |   |   |   |   |   |   |   |   |   |   |   |
| **Segment Reporting Information**                                                |           |            |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Revenues                                                                         |           |            |   |   |   |   |   |   |   |   |   |   | 414 | 389 | 350 |
| Segment Profit                                                                   |           |            |   |   |   |   |   |   |   |   |   |   | 92 | 111 | 111 |
| Interest Expense                                                                 |           |            |   |   |   |   |   |   |   |   |   |   | 137 | 141 | 127 |
| Depreciation on equipment leased to others                                       |           |            |   |   |   |   |   |   |   |   |   |   | 93 | 64 | 47 |
| Provision for credit losses                                                      |           |            |   |   |   |   |   |   |   |   |   |   | 32 | 26 | 17 |
| Segment Assets                                                                   | 4,953          |            |   |   | 4,973 |   |   |   | 3,995 |   |   |   | 4,953 | 4,973 | 3,995 |
| Capital expenditures                                                             |           |            |   |   |   |   |   |   |   |   |   |   | 272 | 172 | 175 |
| Mining | Operating Segments                                                      |           |            |   |   |   |   |   |   |   |   |   |   |   |   |   |
| **Segment Reporting Information**                                                |           |            |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Revenues                                                                         |           |            |   |   |   |   |   |   |   |   |   |   | 472 | 451 | 446 |
| Segment Profit                                                                   |           |            |   |   |   |   |   |   |   |   |   |   | 85 | 60 | 72 |
| Interest Expense                                                                 |           |            |   |   |   |   |   |   |   |   |   |   | 79 | 90 | 90 |
| Depreciation on equipment leased to others                                       |           |            |   |   |   |   |   |   |   |   |   |   | 270 | 250 | 260 |
| Provision for credit losses                                                      |           |            |   |   |   |   |   |   |   |   |   |   | 12 | 27 | 3 |
| Segment Assets                                                                   | 3,441          |            |   |   | 3,212 |   |   |   | 2,635 |   |   |   | 3,441 | 3,212 | 2,635 |
| Capital expenditures                                                             |           |            |   |   |   |   |   |   |   |   |   |   | $ 453 | $ 545 | $ 321 |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow for purchases on long lived, depreciable tangible personal property, nonconsumable in nature, with finite lives used to generate rental income and the cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.
+ References
No definition available.
+ Details**Name:**cfsc_ExpendituresForEquipmentOnOperatingLeasesAndForNonLeasedTransactions**Namespace Prefix:**cfsc_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5
+ Details**Name:**us-gaap_Assets**Namespace Prefix:**us-gaap_**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=26872669&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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690
+ Details**Name:**us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of the cost of borrowed funds accounted for as interest expense.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 9 -Article 9
+ Details**Name:**us-gaap_InterestExpense**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The total depreciation charge recorded for property subject to or held for lease.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229
+ Details**Name:**us-gaap_OperatingLeasesIncomeStatementDepreciationExpenseOnPropertySubjectToOrHeldForLease**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of expense related to estimated loss from loan and lease transactions.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882
+ Details**Name:**us-gaap_ProvisionForLoanAndLeaseLosses**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_SegmentReportingInformationLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |