| **Transactions with Related Parties (Details) - USD ($) $ in Millions**                                   | 3 Months Ended | 12 Months Ended |
|-----------------------------------------------------------------------------------------------------------|----------------|-----------------|
||
| **Related Party Transaction**                                                                             |           |            |   |   |   |   |   |   |   |   |   |
| Dividend paid to Caterpillar                                                                              |           |            |   |   |   |   |   |   | $ 275 | $ 600 | $ 400 |
| Maximum borrowing capacity from Caterpillar, Variable lending agreements                                  | $ 2,830        |            |   |   |   |   |   |   | 2,830 |   |   |
| Maximum lending capacity to Caterpillar, Variable lending agreements                                      | 2,290          |            |   |   |   |   |   |   | 2,290 |   |   |
| Amount available, Committed credit facility extended to Caterpillar                                       | 2,000          |            |   |   |   |   |   |   | 2,000 |   |   |
| Notes payable to Caterpillar                                                                              | 1,637          |            |   |   | $ 1,096 |   |   |   | 1,637 | 1,096 | 1,108 |
| Notes receivable from Caterpillar                                                                         | 530            |            |   |   | 490 |   |   |   | 530 | 490 | 414 |
| Discounts earned on purchased receivables                                                                 |           |            |   |   |   |   |   |   | 207 | 222 | 243 |
| Total revenues                                                                                            | 642            | $ 651           | $ 659 | $ 643 | 648 | $ 653 | $ 683 | $ 689 | 2,595 | 2,673 | 2,885 |
| Depreciation on equipment leased to others                                                                |           |            |   |   |   |   |   |   | 841 | 836 | 870 |
| Caterpillar                                                                                               |           |            |   |   |   |   |   |   |   |   |   |
| **Related Party Transaction**                                                                             |           |            |   |   |   |   |   |   |   |   |   |
| Dividend paid to Caterpillar                                                                              |           |            |   |   |   |   |   |   | 275 | 600 | 400 |
| Maximum borrowing capacity from Caterpillar, Variable lending agreements                                  | 2,830          |            |   |   |   |   |   |   | 2,830 |   |   |
| Maximum lending capacity to Caterpillar, Variable lending agreements                                      | 2,290          |            |   |   |   |   |   |   | 2,290 |   |   |
| Amount available, Committed credit facility extended to Caterpillar                                       | 2,000          |            |   |   |   |   |   |   | 2,000 |   |   |
| Interest expense, Caterpillar                                                                             |           |            |   |   |   |   |   |   | 15 | 6 | 7 |
| Interest income on Notes Receivable with Caterpillar                                                      |           |            |   |   |   |   |   |   | 30 | 21 | 18 |
| Fees on committed credit facility extended to Caterpillar                                                 |           |            |   |   |   |   |   |   | 40 | 40 | 41 |
| Purchases of receivables from Caterpillar                                                                 |           |            |   |   |   |   |   |   | 28,631 | 33,154 | 36,816 |
| Discounts earned on purchased receivables                                                                 |           |            |   |   |   |   |   |   | 207 | 222 | 243 |
| Balance of purchased receivables                                                                          | 2,431          |            |   |   | 2,601 |   |   |   | 2,431 | 2,601 | 3,238 |
| Marketing program payments received                                                                       |           |            |   |   |   |   |   |   | 233 | 188 | 173 |
| Amount of our portfolio that is subject to guarantees by Caterpillar                                      | 403            |            |   |   | 418 |   |   |   | 403 | 418 |   |
| Charges for employee medical plans and postretirement benefit plans administered by Caterpillar           |           |            |   |   |   |   |   |   | 29 | 29 | 30 |
| Contributions to defined benefit plans                                                                    |           |            |   |   |   |   |   |   | 7 | 7 | 7 |
| Stock based compensation expense                                                                          |           |            |   |   |   |   |   |   | 9 | 12 | 11 |
| Operational and administrative support charges reimbursed to Caterpillar                                  |           |            |   |   |   |   |   |   | 28 | 37 | 37 |
| Administrative support services to certain Caterpillar subsidiaries reimbursed by Caterpillar             |           |            |   |   |   |   |   |   | 9 | 12 | 12 |
| Caterpillar Wholly-Owned Dealers                                                                          |           |            |   |   |   |   |   |   |   |   |   |
| **Related Party Transaction**                                                                             |           |            |   |   |   |   |   |   |   |   |   |
| Total portfolio, which includes finance receivables and equipment on operating lease, net of depreciation | $ 18           |            |   |   | $ 49 |   |   |   | 18 | 49 |   |
| Total revenues                                                                                            |           |            |   |   |   |   |   |   | 8 | 9 | 11 |
| Depreciation on equipment leased to others                                                                |           |            |   |   |   |   |   |   | $ 7 | $ 7 | $ 9 |

| 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
Balance of purchased receivables at the end of the reporting period.
+ References
No definition available.
+ Details**Name:**cfsc_BalanceOfFactoredReceivables**Namespace Prefix:**cfsc_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Maximum borrowing capacity under the committed credit facility with parent entity.
+ References
No definition available.
+ Details**Name:**cfsc_CommittedCreditFacilityWithParentEntity**Namespace Prefix:**cfsc_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents the amount of financial merchandising program payments received from the parent entity.  Financial merchandising programs are sponsored by the parent entity and allow the entity to provide financing to customers at rates below standard rates.
+ References
No definition available.
+ Details**Name:**cfsc_FinancialMerchandisingProgramPayments**Namespace Prefix:**cfsc_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Maximum borrowing capacity under the variable lending agreements with parent entity.
+ References
No definition available.
+ Details**Name:**cfsc_MaximumBorrowingCapacityVariableLendingAgreementsWithParentEntity**Namespace Prefix:**cfsc_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Maximum lending capacity under variable lending agreements to parent entity.
+ References
No definition available.
+ Details**Name:**cfsc_MaximumLendingCapacityVariableLendingAgreementsToParentEntity**Namespace Prefix:**cfsc_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total portfolio includes finance receivables and equipment on operating leases, net of depreciation.
+ References
No definition available.
+ Details**Name:**cfsc_Portfolio**Namespace Prefix:**cfsc_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of portfolio, which includes finance receivables and equipment on operating leases, net of depreciation, that is subject to guarantees from our parent company, Caterpillar Inc.
+ References
No definition available.
+ Details**Name:**cfsc_Portfoliosubjecttoguaranteesbyparent**Namespace Prefix:**cfsc_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                         |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Purchases from the parent entity of certain receivables generated by the sales of products to dealers and customers.
+ References
No definition available.
+ Details**Name:**cfsc_PurchasesOfFactoredReceivables**Namespace Prefix:**cfsc_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of selling, general and administrative expenses reimbursed by parent entity resulting from transactions with related parties.
+ References
No definition available.
+ Details**Name:**cfsc_RelatedPartyTransactionReimbursedSellingGeneralAndAdministrationExpenses**Namespace Prefix:**cfsc_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The aggregate financial services revenue and operating interest income earned during the reporting period.
+ References
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+ Details**Name:**us-gaap_FinancialServicesRevenue**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of interest expense incurred on a debt or other obligation to related party.
+ References
No definition available.
+ Details**Name:**us-gaap_InterestExpenseRelatedParty**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of interest income earned from interest-bearing assets owed to the entity by related party.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount for notes payable (written promise to pay), due to related parties.
+ References
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+ Details**Name:**us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
For an unclassified balance sheet, amounts due from parties associated with the reporting entity as evidenced by a written promise to pay.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The total depreciation charge recorded for property subject to or held for lease.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585
+ Details**Name:**us-gaap_PaymentsOfDividends**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs recognized during the period for (1) defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss) on assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments) and for (2) defined contribution plans (to the extent that a plan's defined contributions to an individual's account are to be made for periods in which that individual renders services, the net cost for a period is the contribution called for in that period; if a plan calls for contributions for periods after an individual retires or terminates, the estimated cost is accrued during the employee's service period).
+ References
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| 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_RelatedPartyTransactionLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of selling, general and administrative expenses resulting from transactions, excluding transactions that are eliminated in consolidated or combined financial statements, with related party.
+ References
No definition available.
+ Details**Name:**us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.
+ References
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+ Details**Name:**us-gaap_RevenueFromRelatedParties**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_ParentCompanyMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=cfsc_CaterpillarWhollyOwnedDealersMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |