| **Summary of Significant Accounting Policies (Policies)**   | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
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| **Accounting Policies [Abstract]**                          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| Basis of Consolidation                                      | Basis of Consolidation The consolidated financial statements include the accounts of Cat Financial.  Investments in companies that are owned 20 percent to 50 percent or are less than 20 percent owned and for which we have significant influence are accounted for by the equity method.  Investments in companies that are less than 20 percent owned and for which we do not have significant influence are accounted for by the cost method.  All material intercompany balances have been eliminated.   We consolidate all variable-interest entities (VIEs) where we are the primary beneficiary.  For VIEs, we assess whether we are the primary beneficiary as prescribed by the accounting guidance on the consolidation of VIEs.  The primary beneficiary of a VIE is the party that has the power to direct the activities that most significantly impact the performance of the entity and the obligation to absorb losses or the right to receive benefits that could potentially be significant to the entity.  Please refer to Note 10 for more information.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| Recognition of Earned Income                                | Recognition of Earned Income •Retail finance revenue on finance leases and installment sale contracts is recognized over the term of the contract at a constant rate of return on the scheduled outstanding principal balance.  Revenue on retail notes is recognized based on the daily balance of retail receivables outstanding and the applicable effective interest rate.•Operating lease revenue is recorded on a straight-line basis in the period earned over the life of the contract.•Wholesale finance revenue on finance leases and installment sale contracts related to financing dealer inventory and rental fleets is recognized over the term of the contract at a constant rate of return on the scheduled outstanding principal balance.  Revenue on wholesale notes is recognized based on the daily balance of wholesale receivables outstanding and the applicable effective interest rate.•Loan origination and commitment fees are deferred and amortized to revenue using the interest method over the life of the finance receivables.Recognition of income is suspended and the loan or finance lease is placed on non-accrual status when management determines that collection of future income is not probable (generally after 120 days past due except in locations where local regulatory requirements dictate a different method, or instances in which relevant information is known that warrants placing the loan or finance lease on non-accrual status).  Accrual is resumed, and previously suspended income is recognized, when the loan or finance lease becomes contractually current and/or collection doubts are removed.  Cash receipts on impaired loans or finance leases are recorded against the receivable and then to any unrecognized income.  A loan or finance lease is considered impaired, based on current information and events, if it is probable that we will be unable to collect all amounts due according to the contractual terms of the loan or finance lease.  We consider a loan or finance lease past due if any portion of a contractual payment is due and unpaid for more than 30 days. Revenues are presented net of sales and other related taxes. |
| Depreciation                                                | Depreciation Depreciation for equipment on operating leases is recognized using the straight-line method over the lease term, typically one to seven years.  The depreciable basis is the original cost of the equipment less the estimated residual value of the equipment at the end of the lease term.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| Debt Issuance Costs                                         | Debt Issuance Costs  Debt issuance costs are capitalized and amortized to Interest expense over the term of the debt issue.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| Derivative Financial Instruments                            | Derivative Financial Instruments Our earnings and cash flows are subject to fluctuations due to changes in foreign currency exchange rates and interest rates.  Our Risk Management Policy allows for the use of derivative financial instruments to prudently manage foreign currency exchange rate and interest rate exposures and not for the purpose of creating speculative positions.  Derivatives that we use are primarily foreign currency forward, option, and cross currency contracts and interest rate swaps.  All derivatives are recorded at fair value.  See Note 9 for additional information.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| Foreign Currency Translation                                | Foreign Currency Translation Assets and liabilities of foreign subsidiaries (the majority of which use the local currency as their functional currency) are translated at current exchange rates.  The effects of translation adjustments are reported as a separate component of Accumulated other comprehensive income entitled "Foreign currency translation."  Gains and losses resulting from the remeasurement of foreign currency amounts to functional currency are included in Other income (expense) on the Consolidated Statements of Profit.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| Use of Estimates in the Preparation of Financial Statements | Use of Estimates in the Preparation of Financial Statements The preparation of financial statements, in conformity with generally accepted accounting principles in the United States of America, requires management to make estimates and assumptions that affect the reported amounts.  Significant estimates include the Allowance for credit losses, residual values for leased assets, income taxes and the assumptions used to determine the fair value of derivatives.  Actual results may differ from these estimates.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |

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| - Definition
Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting.  The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary.
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| - Definition
Disclosure of accounting policy for costs incurred to obtain or issue debt, the effects of refinancings, method of amortizing deferred financing costs and original issue discount, and classifications of debt on the balance sheet.
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| - Definition
Disclosure of accounting policy for depreciation, depletion, and amortization of property and equipment costs, including methods used and estimated useful lives and how impairment of such assets is assessed and recognized.
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No definition available.
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| - Definition
Disclosure of accounting policy for its derivative instruments and hedging activities.
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| - Definition
Disclosure of accounting policy for (1) transactions denominated in a currency other than the reporting enterprise's functional currency, (2) translating foreign currency financial statements that are incorporated into the financial statements of the reporting enterprise by consolidation, combination, or the equity method of accounting, and (3) remeasurement of the financial statements of a foreign reporting enterprise in a hyperinflationary economy.
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| - Definition
Disclosure of accounting policy for revenue recognition. If the entity has different policies for different types of revenue transactions, the policy for each material type of transaction is generally disclosed. If a sales transaction has multiple element arrangements (for example, delivery of multiple products, services or the rights to use assets) the disclosure may indicate the accounting policy for each unit of accounting as well as how units of accounting are determined and valued. The disclosure may encompass important judgment as to appropriateness of principles related to recognition of revenue. The disclosure also may indicate the entity's treatment of any unearned or deferred revenue that arises from the transaction.
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| - Definition
Disclosure of accounting policy for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles.
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