| **Summary of Significant Accounting Policies**                                      | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  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| **Organization, Consolidation and Presentation of Financial Statements [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              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| Summary of Significant Accounting Policies                                          | SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES A.  Nature of Operations Caterpillar Financial Services Corporation, a Delaware corporation organized in 1981 (together with its subsidiaries, "Cat Financial," "the Company," "we" and "our"), is a wholly-owned finance subsidiary of Caterpillar Inc. (together with its other subsidiaries, "Caterpillar" or "Cat").  Our primary business is to provide retail and wholesale financing alternatives for Caterpillar products to customers and dealers around the world.  Retail financing is primarily comprised of financing of Caterpillar equipment, machinery and engines.  In addition, we also provide financing for vehicles, power generation facilities and marine vessels that, in most cases, incorporate Caterpillar products.  We also provide wholesale financing to Caterpillar dealers and purchase short-term receivables from Caterpillar.  The various financing plans offered by Cat Financial are primarily designed to increase the opportunity for sales of Caterpillar products and generate financing income for Cat Financial.  A significant portion of our activities is conducted in North America.  However, we have additional offices and subsidiaries in Latin America, Europe and Asia/Pacific.  B.  Basis of Presentation The accompanying consolidated financial statements include the accounts of Cat Financial and consolidated variable interest entities (VIEs) in which Cat Financial is the primary beneficiary.  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 both the power to direct the activities that most significantly impact the entity’s economic performance and the obligation to absorb losses or the right to receive benefits that could potentially be significant to the entity.  Please refer to Note 11 for more information.  We have customers that are VIEs of which we are not the primary beneficiary. Although we have provided financial support to these entities and therefore have a variable interest, we do not have the power to direct the activities that most significantly impact their economic performance.  Our maximum exposure to loss from our involvement with these VIEs is limited to the credit risk inherently present in the financial support that we have provided. These risks are evaluated and reflected in our financial statements as part of our overall portfolio of finance receivables and related allowance for credit losses. Certain amounts for prior years have been reclassified to conform with current-year financial statement presentation.C.  Recognition of Earned Income Finance revenue is recorded over the life of the related finance receivable using the interest method, including the accretion of certain direct origination costs that are deferred. Revenue from rental payments received on operating leases is recognized on a straight-line basis over the term of the lease. Recognition of finance revenue and operating lease revenue is suspended and the account is placed on non-accrual status when management determines that collection of future income is not probable (generally after 120 days past due).  Recognition is resumed, and previously suspended income is recognized, when the account becomes current and collection of remaining amounts is considered probable. We participate in certain marketing programs offered in conjunction with Caterpillar and/or Caterpillar dealers that allow us to periodically offer financing to customers at interest rates that are below market rates.  Under these marketing programs, Caterpillar and/or the dealer funds an amount at the outset of the transaction, which we then recognize as revenue over the term of the financing.  The funds we receive from Caterpillar and/or the dealer equal an amount that when combined with the customer’s contractual interest provides us with a market interest rate.D.  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. E.  Residual Values The residuals for leases classified as operating leases are included in Equipment on operating leases.  The residuals for leases classified as finance leases, in accordance with lease accounting, are included in finance receivables. During the term of the leases, residual values are monitored.  If estimated end-of-term market values of leased equipment reflect a non-temporary impairment due to economic factors, obsolescence or other adverse circumstances, the residual value of the leased equipment is adjusted so that the carrying value at end of lease term will approximate the estimated end-of-term market value.  For equipment on operating leases, adjustments are made on a straight-line basis over the remaining term of the lease through depreciation expense.  For finance leases, adjustments are recognized at the time of assessment through a reduction of finance revenue. F.  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 (policy) allows for the use of derivative financial instruments to manage foreign currency exchange rate and interest rate exposures.  Our policy specifies that derivatives are not to be used for speculative purposes.  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 10 for additional information. G.  Allowance for Credit Losses The allowance for credit losses is an estimate of the losses inherent in our finance receivable portfolio and includes consideration of accounts that have been individually identified as impaired, as well as pools of finance receivables where it is probable that certain receivables in the pool are impaired but the individual accounts cannot yet be identified.   In identifying and measuring impairment, management takes into consideration past loss experience, known and inherent risks in the portfolio, adverse situations that may affect the borrower’s ability to repay, estimated value of underlying collateral and current economic conditions.  Accounts are identified for individual review based on past-due status and information available about the customer, such as financial statements, news reports and published credit ratings, as well as general information regarding industry trends and the economic environment in which our customers operate.  The allowance for credit losses attributable to finance receivables that are individually evaluated and determined to be impaired is based either on the present value of expected future cash flows discounted at the receivables' effective interest rate or the fair value of the collateral for collateral-dependent receivables.  In determining collateral value, we estimate the current fair market value of the collateral less selling costs.  We also consider credit enhancements such as additional collateral and contractual third-party guarantees. The allowance for credit losses attributable to the remaining accounts not yet individually identified as impaired is estimated based on loss forecast models utilizing probabilities of default, our estimate of the loss emergence period and the estimated loss given default.  In addition, qualitative factors not able to be fully captured in our loss forecast models including industry trends, macroeconomic factors and model imprecision are considered in the evaluation of the adequacy of the allowance for credit losses.  These qualitative factors are subjective and require a degree of management judgment.Receivable balances, including accrued interest, are written off against the allowance for credit losses when, in the judgment of management, they are considered uncollectible (generally upon repossession of the collateral). The amount of the write-off is determined by comparing the fair value of the collateral, less cost to sell, to the recorded investment. Subsequent recoveries, if any, are credited to the allowance for credit losses when received.H.  Income Taxes The Provision for income taxes is determined using the asset and liability approach taking into account guidance related to uncertain tax positions.  Tax laws require items to be included in tax filings at different times than the items are reflected in the financial statements.  A current liability is recognized for the estimated taxes payable for the current year.  Deferred taxes represent the future tax consequences expected to occur when the reported amounts of assets and liabilities are recovered or paid.  Deferred taxes are adjusted for enacted changes in tax rates and tax laws.  Valuation allowances are recorded to reduce deferred tax assets when it is more likely than not that a tax benefit will not be realized. We join Caterpillar in the filing of a consolidated U.S. Federal income tax return and certain state income tax returns.  In accordance with our tax sharing agreement with Caterpillar, we generally pay to or receive from Caterpillar our allocated share of income taxes or credits reflected in these consolidated filings. This amount is calculated on a separate return basis by taking taxable income times the applicable statutory tax rate and includes payment for certain tax attributes earned during the year. I.  Foreign Currency Translation The functional currency for most of our subsidiaries is the respective local currency.  Gains and losses resulting from the remeasurement of foreign currency amounts to the functional currency are included in Other income (expense) in the Consolidated Statements of Profit.  Gains and losses resulting from translating assets and liabilities from the functional currency to U.S. dollars are included in Accumulated other comprehensive income/(loss) in the Consolidated Statements of Financial Position.  J.  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.K.  New Accounting Pronouncements Reporting discontinued operations and disclosures of disposals of components of an entity – In April 2014, the Financial Accounting Standards Board (FASB) issued accounting guidance for determining which disposals can be presented as discontinued operations and modifies related disclosure requirements.  The guidance defines a discontinued operation as a disposal of a component or group of components that is disposed of or is classified as held for sale and represents a strategic shift that has (or will have) a major effect on an entity's operations and financial results.  This guidance was effective January 1, 2015 and did not have a material impact on our financial statements.Revenue recognition – In May 2014, the  FASB issued new revenue recognition guidance to provide a single, comprehensive revenue recognition model for all contracts with customers.  Under the new guidance, an entity will recognize revenue to depict the transfer of promised goods or services to customers at an amount that the entity expects to be entitled to in exchange for those goods or services.  A five step model has been introduced for an entity to apply when recognizing revenue.  The new guidance also includes enhanced disclosure requirements and is effective January 1, 2018, with early adoption permitted for January 1, 2017.  Entities have the option to apply the new guidance under a retrospective approach to each prior reporting period presented, or a modified retrospective approach with the cumulative effect of initially applying the new guidance recognized at the date of initial application within the Consolidated Statement of Changes in Stockholder's Equity.  We are in the process of evaluating the application and implementation of the new guidance.Variable interest entities – In February 2015, the FASB issued accounting guidance on the consolidation of VIEs.  The new guidance revises previous guidance by establishing an analysis for determining whether a limited partnership or similar entity is a VIE and whether outsourced decision-maker fees are considered variable interests.  In addition, the new guidance revises how a reporting entity evaluates economics and related parties when assessing who should consolidate a VIE.  This guidance was effective January 1, 2016 and did not have a material impact on our financial statements.Presentation of debt issuance costs – In April 2015, the FASB issued accounting guidance which requires debt issuance costs to be presented in the balance sheet as a direct deduction from the carrying value of the associated debt liability.  Prior to the issuance of the new guidance, debt issuance costs were required to be presented in the balance sheet as an asset.  This guidance was effective January 1, 2016 and did not have a material impact on our financial statements.Recognition and measurement of financial assets and financial liabilities – In January 2016, the FASB issued accounting guidance that affects the accounting for equity investments, financial liabilities accounted for under the fair value option and the presentation and disclosure requirements for financial instruments. Under the new guidance, all equity investments in unconsolidated entities (other than those accounted for using the equity method of accounting) will generally be measured at fair value through earnings. There will no longer be an available-for-sale classification for equity securities with readily determinable fair values. For financial liabilities when the fair value option has been elected, changes in fair value due to instrument-specific credit risk will be recognized separately in other comprehensive income. In addition, the FASB clarified guidance related to the valuation allowance assessment when recognizing deferred tax assets resulting from unrealized losses on available-for-sale debt securities. The new guidance is effective January 1, 2018, with the cumulative effect adjustment from initially applying the new guidance recognized in the Statement of Financial Position as of the beginning of the year of adoption.  We do not expect the adoption to have a material impact on our financial statements. |

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The entire disclosure for the general note to the financial statements for the reporting entity which may include, descriptions of the basis of presentation, business description, significant accounting policies, consolidations, reclassifications, new pronouncements not yet adopted and changes in accounting principles.
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