| **Segment Information (Details) - USD ($) $ in Millions** | 3 Months Ended | 9 Months Ended |         |
|-----------------------------------------------------------|----------------|----------------|---------|
||
| **Segment Reporting Information**                         |           |           |    |   |   |
| Revenues                                                  | $ 653          | $ 743          | $ 2,025 | $ 2,182 |   |
| Segment Profit                                            | 153            | 197            | 490     | 587 |   |
| Interest Expense                                          | 144            | 158            | 445     | 475 |   |
| Depreciation on equipment leased to others                | 207            | 226            | 629     | 653 |   |
| Provision for credit losses                               | 22             | 38             | 89      | 106 |   |
| Segment Assets                                            | 33,517         |           | 33,517  |   | $ 35,176 |
| Capital expenditures                                      | 357            | 427            | 993     | 1,206 |   |
| Operating Segments                                        |           |           |    |   |   |
| **Segment Reporting Information**                         |           |           |    |   |   |
| Revenues                                                  | 643            | 735            | 1,994   | 2,150 |   |
| Segment Profit                                            | 168            | 214            | 538     | 624 |   |
| Interest Expense                                          | 145            | 162            | 451     | 480 |   |
| Depreciation on equipment leased to others                | 207            | 226            | 629     | 652 |   |
| Provision for credit losses                               | 24             | 37             | 88      | 104 |   |
| Segment Assets                                            | 32,021         |           | 32,021  |   | 33,866 |
| Capital expenditures                                      | 356            | 427            | 991     | 1,204 |   |
| Unallocated                                               |           |           |    |   |   |
| **Segment Reporting Information**                         |           |           |    |   |   |
| Revenues                                                  | 18             | 15             | 54      | 53 |   |
| Segment Profit                                            | (26)           | (22)           | (72)    | (56) |   |
| Interest Expense                                          | 17             | 12             | 49      | 35 |   |
| Depreciation on equipment leased to others                | 0              | 0              | 0       | 1 |   |
| Provision for credit losses                               | (1)            | (1)            | (1)     | 2 |   |
| Segment Assets                                            | 1,891          |           | 1,891   |   | 1,648 |
| Capital expenditures                                      | 0              | 0              | 0       | 1 |   |
| Timing                                                    |           |           |    |   |   |
| **Segment Reporting Information**                         |           |           |    |   |   |
| Revenues                                                  | (8)            | (7)            | (23)    | (21) |   |
| Segment Profit                                            | (3)            | (5)            | (17)    | (7) |   |
| Interest Expense                                          | 0              | 0              | 0       | 0 |   |
| Depreciation on equipment leased to others                | 0              | 0              | 0       | 0 |   |
| Provision for credit losses                               | (1)            | 2              | 2       | 0 |   |
| Segment Assets                                            | 27             |           | 27      |   | 120 |
| Capital expenditures                                      | 1              | 0              | 2       | 1 |   |
| Methodology                                               |           |           |    |   |   |
| **Segment Reporting Information**                         |           |           |    |   |   |
| Revenues                                                  | 0              | 0              | 0       | 0 |   |
| Segment Profit                                            | 14             | 10             | 41      | 26 |   |
| Interest Expense                                          | (18)           | (16)           | (55)    | (40) |   |
| Depreciation on equipment leased to others                | 0              | 0              | 0       | 0 |   |
| Provision for credit losses                               | 0              | 0              | 0       | 0 |   |
| Segment Assets                                            | (201)          |           | (201)   |   | (215) |
| Capital expenditures                                      | 0              | 0              | 0       | 0 |   |
| Inter-segment Eliminations                                |           |           |    |   |   |
| **Segment Reporting Information**                         |           |           |    |   |   |
| Revenues                                                  | 0              | 0              | 0       | 0 |   |
| Segment Profit                                            | 0              | 0              | 0       | 0 |   |
| Interest Expense                                          | 0              | 0              | 0       | 0 |   |
| Depreciation on equipment leased to others                | 0              | 0              | 0       | 0 |   |
| Provision for credit losses                               | 0              | 0              | 0       | 0 |   |
| Segment Assets                                            | (221)          |           | (221)   |   | (243) |
| Capital expenditures                                      | 0              | 0              | 0       | 0 |   |
| North America | Operating Segments                        |           |           |    |   |   |
| **Segment Reporting Information**                         |           |           |    |   |   |
| Revenues                                                  | 291            | 274            | 865     | 786 |   |
| Segment Profit                                            | 99             | 97             | 289     | 264 |   |
| Interest Expense                                          | 66             | 61             | 193     | 176 |   |
| Depreciation on equipment leased to others                | 102            | 94             | 303     | 261 |   |
| Provision for credit losses                               | (4)            | (4)            | (2)     | 5 |   |
| Segment Assets                                            | 14,078         |           | 14,078  |   | 13,661 |
| Capital expenditures                                      | 292            | 308            | 746     | 786 |   |
| Europe | Operating Segments                               |           |           |    |   |   |
| **Segment Reporting Information**                         |           |           |    |   |   |
| Revenues                                                  | 70             | 89             | 216     | 271 |   |
| Segment Profit                                            | 29             | 34             | 85      | 90 |   |
| Interest Expense                                          | 8              | 12             | 24      | 40 |   |
| Depreciation on equipment leased to others                | 18             | 24             | 57      | 72 |   |
| Provision for credit losses                               | 0              | (4)            | 0       | 5 |   |
| Segment Assets                                            | 3,987          |           | 3,987   |   | 4,276 |
| Capital expenditures                                      | 31             | 41             | 83      | 105 |   |
| Asia/Pacific | Operating Segments                         |           |           |    |   |   |
| **Segment Reporting Information**                         |           |           |    |   |   |
| Revenues                                                  | 66             | 94             | 223     | 281 |   |
| Segment Profit                                            | 17             | 32             | 52      | 104 |   |
| Interest Expense                                          | 22             | 30             | 80      | 88 |   |
| Depreciation on equipment leased to others                | 5              | 6              | 15      | 18 |   |
| Provision for credit losses                               | 2              | 9              | 22      | 23 |   |
| Segment Assets                                            | 3,921          |           | 3,921   |   | 4,767 |
| Capital expenditures                                      | 2              | 6              | 19      | 23 |   |
| Latin America and CPF | Operating Segments                |           |           |    |   |   |
| **Segment Reporting Information**                         |           |           |    |   |   |
| Revenues                                                  | 126            | 162            | 400     | 450 |   |
| Segment Profit                                            | 20             | 33             | 69      | 115 |   |
| Interest Expense                                          | 36             | 43             | 113     | 126 |   |
| Depreciation on equipment leased to others                | 25             | 34             | 81      | 90 |   |
| Provision for credit losses                               | 18             | 30             | 58      | 44 |   |
| Segment Assets                                            | 7,156          |           | 7,156   |   | 8,001 |
| Capital expenditures                                      | 31             | 22             | 74      | 82 |   |
| Mining | Operating Segments                               |           |           |    |   |   |
| **Segment Reporting Information**                         |           |           |    |   |   |
| Revenues                                                  | 90             | 116            | 290     | 362 |   |
| Segment Profit                                            | 3              | 18             | 43      | 51 |   |
| Interest Expense                                          | 13             | 16             | 41      | 50 |   |
| Depreciation on equipment leased to others                | 57             | 68             | 173     | 211 |   |
| Provision for credit losses                               | 8              | 6              | 10      | 27 |   |
| Segment Assets                                            | 2,879          |           | 2,879   |   | $ 3,161 |
| Capital expenditures                                      | $ 0            | $ 50           | $ 69    | $ 208 |   |

| 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 7
+ 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=d3e20235-122688
+ 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=d3e536633-122882
+ 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 loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882Reference 3: 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=56944662&loc=d3e3602-108585
+ Details**Name:**us-gaap_ProvisionForLoanLeaseAndOtherLosses**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**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_SegmentReportingInformationLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_ConsolidationItemsAxis=us-gaap_CorporateNonSegmentMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_ConsolidationItemsAxis=cfsc_TimingMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_ConsolidationItemsAxis=cfsc_MethodologyMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                            |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_ConsolidationItemsAxis=us-gaap_IntersegmentEliminationMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_StatementBusinessSegmentsAxis=us-gaap_NorthAmericaMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_StatementBusinessSegmentsAxis=us-gaap_EMEAMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_StatementBusinessSegmentsAxis=us-gaap_AsiaPacificMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_StatementBusinessSegmentsAxis=cfsc_LatinAmericaandCPFMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_StatementBusinessSegmentsAxis=cfsc_MiningReportableSegmentMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |