| **Finance Receivables**    | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 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| **Receivables [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          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| Finance Receivables        | FINANCE RECEIVABLESA summary of finance receivables included in the Consolidated Statements of Financial Position as of December 31, was as follows:(Millions of dollars)      2015 2014Finance leases and installment sale contracts – Retail $13,728 $14,455Retail notes receivable 10,616 11,005Wholesale notes receivable 3,887 4,514Finance leases and installment sale contracts – Wholesale 289 384  28,520 30,358Less: Unearned income (794) (883)Less: Allowance for credit losses (338) (401)Total finance receivables, net $27,388 $29,074     Maturities of our finance receivables, as of December 31, 2015, reflect contractual repayments due from borrowers and were as follows:(Millions of dollars)              Amounts due in RetailInstallmentSaleContracts WholesaleInstallmentSale Contracts RetailFinance Leases WholesaleFinance Leases RetailNotes Wholesale Notes Total2016 $2,597 $48 $2,543 $53 $4,297 $3,495 $13,0332017 2,015 7 1,661 52 1,940 232 5,9072018 1,368 3 939 38 1,450 158 3,9562019 699 1 425 18 1,024 2 2,1692020 202 — 170 6 929 — 1,307Thereafter 11 — 98 2 976 — 1,087Total 6,892 59 5,836 169 10,616 3,887 27,459Guaranteed residual value — — 334 35 — — 369Unguaranteed residual value — — 666 26 — — 692Total $6,892 $59 $6,836 $230 $10,616 $3,887 $28,520               Our finance receivables generally may be repaid or refinanced without penalty prior to contractual maturity and we also sell finance receivables to third parties to mitigate the concentration of credit risk with certain customers.  Accordingly, this presentation should not be regarded as a forecast of future cash collections.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. Our allowance for credit losses is segregated into three portfolio segments: •Customer - Finance receivables with retail customers.•Dealer - Finance receivables with Caterpillar dealers.•Caterpillar Purchased Receivables - Trade receivables purchased from Caterpillar entities.A portfolio segment is the level at which the Company develops a systematic methodology for determining its allowance for credit losses.We further evaluate our portfolio segments by the class of finance receivables, which is defined as a level of information (below a portfolio segment) in which the finance receivables have the same initial measurement attribute and a similar method for assessing and monitoring credit risk.  Typically, our finance receivables within a geographic area have similar credit risk profiles and methods for assessing and monitoring credit risk.  Our classes, which align with management reporting for credit losses, are as follows:•North America - Finance receivables originated in the United States or Canada.•Europe - Finance receivables originated in Europe, Africa, Middle East and the Commonwealth of Independent States.•Asia/Pacific - Finance receivables originated in Australia, New Zealand, China, Japan, South Korea and Southeast Asia.•Mining - Finance receivables related to large mining customers worldwide.•Latin America - Finance receivables originated in Central and South American countries and Mexico.•Caterpillar Power Finance - Finance receivables related to marine vessels with Caterpillar engines worldwide and Caterpillar electrical power generation, gas compression and co-generation systems and non-Caterpillar equipment that is powered by these systems worldwide.Our allowance for credit losses as of December 31, 2015 was $338 million or 1.22 percent of net finance receivables compared with $401 million or 1.36 percent as of December 31, 2014, which is a decrease of $63 million.  The decrease in allowance rate is primarily a result of changes in our estimate of the loss emergence period and loss given default.  An analysis of the allowance for credit losses was as follows:(Millions of dollars)          December 31, 2015Allowance for Credit Losses: Customer Dealer CaterpillarPurchased Receivables TotalBalance at beginning of year $388 $10 $3 $401Receivables written off (196) — — (196)Recoveries on receivables previously written off 41 — — 41Provision for credit losses 119 (1) (1) 117Adjustment due to sale of receivables (2) — — (2)Foreign currency translation adjustment (23) — — (23)Balance at end of year $327 $9 $2 $338         Individually evaluated for impairment $65 $— $— $65Collectively evaluated for impairment 262 9 2 273Ending Balance $327 $9 $2 $338         Recorded Investment in Finance Receivables:        Individually evaluated for impairment $601 $— $— $601Collectively evaluated for impairment 19,431 5,093 2,601 27,125Ending Balance $20,032 $5,093 $2,601 $27,726         (Millions of dollars)          December 31, 2014Allowance for Credit Losses: Customer Dealer CaterpillarPurchased Receivables TotalBalance at beginning of year $374 $10 $3 $387Receivables written off (146) — — (146)Recoveries on receivables previously written off 47 — — 47Provision for credit losses 136 — — 136Adjustment due to sale of receivables (3) — — (3)Foreign currency translation adjustment (20) — — (20)Balance at end of year $388 $10 $3 $401         Individually evaluated for impairment $75 $— $— $75Collectively evaluated for impairment 313 10 3 326Ending Balance $388 $10 $3 $401         Recorded Investment in Finance Receivables:        Individually evaluated for impairment $614 $— $— $614Collectively evaluated for impairment 20,454 5,169 3,238 28,861Ending Balance $21,068 $5,169 $3,238 $29,475         Credit quality of finance receivablesAt origination, we evaluate credit risk based on a variety of credit quality factors including prior payment experience, customer financial information, credit-rating agency ratings, loan-to-value ratios and other internal metrics. On an ongoing basis, we monitor credit quality based on past-due status and collection experience as there is a meaningful correlation between the past-due status of customers and the risk of loss. In determining past-due status, we consider the entire finance receivable balance past due when any installment is over 30 days past due.  The tables below summarize our recorded investment of finance receivables by aging category.(Millions of dollars)                December 31, 2015  31-60 Days Past Due 61-90 Days Past Due 91+ Days Past Due TotalPast Due Current TotalFinance Receivables 91+ Still AccruingCustomer              North America $45 $12 $30 $87 $8,031 $8,118 $4Europe 18 7 44 69 2,358 2,427 9Asia/Pacific 22 12 21 55 2,108 2,163 6Mining 6 1 68 75 1,793 1,868 1Latin America 45 31 199 275 1,998 2,273 —Caterpillar Power Finance — 1 35 36 3,147 3,183 2Dealer              North America — — — — 3,387 3,387 —Europe — — — — 330 330 —Asia/Pacific — — — — 611 611 —Mining — — — — 4 4 —Latin America — — — — 758 758 —Caterpillar Power Finance — — — — 3 3 —Caterpillar Purchased Receivables              North America 16 5 1 22 1,386 1,408 1Europe 4 — 4 8 307 315 3Asia/Pacific — — — — 407 407 —Mining — — — — — — —Latin America — — — — 454 454 —Caterpillar Power Finance — 1 — 1 16 17 —Total $156 $70 $402 $628 $27,098 $27,726 $26               (Millions of dollars)                December 31, 2014  31-60 Days Past Due 61-90 Days Past Due 91+ Days Past Due TotalPast Due Current TotalFinance Receivables 91+ Still AccruingCustomer              North America $46 $8 $27 $81 $7,291 $7,372 $4Europe 16 23 29 68 2,607 2,675 6Asia/Pacific 29 22 69 120 2,773 2,893 16Mining 28 — 11 39 2,084 2,123 —Latin America 55 23 196 274 2,583 2,857 8Caterpillar Power Finance 1 4 64 69 3,079 3,148 1Dealer              North America — — — — 3,209 3,209 —Europe — — — — 467 467 —Asia/Pacific — — — — 637 637 —Mining — — — — 3 3 —Latin America — — — — 853 853 —Caterpillar Power Finance — — — — — — —Caterpillar Purchased Receivables              North America 23 5 1 29 1,916 1,945 1Europe 4 1 5 10 429 439 1Asia/Pacific — — — — 401 401 —Mining — — — — — — —Latin America 6 5 — 11 420 431 —Caterpillar Power Finance — — 1 1 21 22 1Total $208 $91 $403 $702 $28,773 $29,475 $38               Impaired finance receivablesFor all classes, a finance receivable 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.  Impaired finance receivables include finance receivables that have been restructured and are considered to be Troubled Debt Restructures.There were no impaired finance receivables as of December 31, 2015, 2014 and 2013, for the Dealer and Caterpillar Purchased Receivables portfolio segments.  Our recorded investment in impaired finance receivables and the related unpaid principal balances and allowance for the Customer portfolio segment were as follows:(Millions of dollars)              As of December 31, 2015 As of December 31, 2014Impaired Finance Receivables WithNo Allowance Recorded RecordedInvestment UnpaidPrincipalBalance RelatedAllowance RecordedInvestment UnpaidPrincipalBalance RelatedAllowanceNorth America $12 $12 $— $14 $14 $—Europe 41 41 — 44 43 —Asia/Pacific 1 1 — 2 2 —Mining 84 84 — 29 29 —Latin America 28 28 — 34 34 —Caterpillar Power Finance 242 241 — 129 128 —Total $408 $407 $— $252 $250 $—Impaired Finance Receivables WithAn Allowance Recorded            North America $14 $13 $4 $6 $6 $1Europe 11 10 5 12 12 4Asia/Pacific 34 34 4 29 29 8Mining 11 11 3 138 137 9Latin America 53 53 21 42 42 12Caterpillar Power Finance 70 70 28 135 134 41Total $193 $191 $65 $362 $360 $75Total Impaired Finance Receivables            North America $26 $25 $4 $20 $20 $1Europe 52 51 5 56 55 4Asia/Pacific 35 35 4 31 31 8Mining 95 95 3 167 166 9Latin America 81 81 21 76 76 12Caterpillar Power Finance 312 311 28 264 262 41Total $601 $598 $65 $614 $610 $75             (Millions of dollars)              Year Ended December 31, 2015 Year Ended December 31, 2014 Year Ended December 31, 2013Impaired Finance Receivables WithNo Allowance Recorded AverageRecordedInvestment InterestIncomeRecognized AverageRecordedInvestment InterestIncomeRecognized AverageRecordedInvestment InterestIncomeRecognizedNorth America $12 $1 $20 $1 $25 $3Europe 42 1 47 1 49 1Asia/Pacific 2 — 3 — 4 —Mining 75 3 69 3 61 3Latin America 31 — 30 — 11 —Caterpillar Power Finance 170 5 164 6 271 5Total $332 $10 $333 $11 $421 $12Impaired Finance Receivables WithAn Allowance Recorded            North America $9 $— $9 $— $18 $1Europe 14 1 21 1 22 1Asia/Pacific 44 2 23 1 18 1Mining 39 1 90 7 1 —Latin America 56 3 36 1 52 2Caterpillar Power Finance 115 3 96 2 135 1Total $277 $10 $275 $12 $246 $6Total Impaired Finance Receivables            North America $21 $1 $29 $1 $43 $4Europe 56 2 68 2 71 2Asia/Pacific 46 2 26 1 22 1Mining 114 4 159 10 62 3Latin America 87 3 66 1 63 2Caterpillar Power Finance 285 8 260 8 406 6Total $609 $20 $608 $23 $667 $18             Recognition of income is suspended and the finance receivable 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 finance receivable becomes current and collection of remaining amounts is considered probable.  Payments received while the finance receivable is on non-accrual status are applied to interest and principal in accordance with the contractual terms. As of December 31, 2015 and 2014, there were no finance receivables on non-accrual status for the Dealer portfolio segment.  As of December 31, 2015 and 2014, there was $1 million and $4 million, respectively, in finance receivables on non-accrual status for the Caterpillar Purchased Receivables portfolio segment, all of which was in the Europe finance receivable class.   The investment in Customer finance receivables on non-accrual status as of December 31, was as follows: (Millions of dollars)      2015 2014North America $31 $27Europe 39 28Asia/Pacific 15 54Mining 106 62Latin America 217 201Caterpillar Power Finance 77 96Total $485 $468     Troubled debt restructuringsA restructuring of a finance receivable constitutes a troubled debt restructuring (TDR) when the lender grants a concession it would not otherwise consider to a borrower experiencing financial difficulties. Concessions granted may include extended contract maturities, inclusion of interest only periods, below market interest rates, extended skip payment periods and reduction of principal and/or accrued interest.  As of December 31, 2015, there were $3 million of additional funds committed to lend to a borrower whose terms have been modified in a TDR. There were no remaining commitments to lend additional funds to a borrower whose terms have been modified in a TDR as of December 31, 2014 and 2013.There were no finance receivables modified as TDRs during the years ended December 31, 2015, 2014 and 2013 for the Dealer or Caterpillar Purchased Receivables portfolio segments.  Finance receivables in the Customer portfolio segment modified as TDRs during the years ended December 31, 2015, 2014 and 2013, were as follows:(Dollars in millions) Year Ended December 31, 2015  Number ofContracts Pre-TDRRecorded Investment Post-TDRRecorded InvestmentNorth America 14 $1 $1Europe 23 2 2Asia/Pacific 21 26 26Mining 4 65 65Latin America 11 1 2Caterpillar Power Finance 21 259 242Total 94 $354 $338         Year Ended December 31, 2014  Number ofContracts Pre-TDRRecorded Investment Post-TDRRecorded InvestmentNorth America 34 $12 $7Europe 8 7 7Asia/Pacific 2 — —Mining 51 185 176Latin America 35 31 30Caterpillar Power Finance 18 137 139Total 148 $372 $359         Year Ended December 31, 2013  Number ofContracts Pre-TDRRecorded Investment Post-TDRRecorded InvestmentNorth America 62 $9 $9Europe 51 7 7Asia/Pacific 3 1 1Mining 45 123 123Latin America 32 3 3Caterpillar Power Finance 17 153 157Total 210 $296 $300       During the years ended December 31, 2015 and 2013, $4 million and $25 million, respectively, of additional funds were subsequently loaned to a borrower whose terms had been modified in a TDR. The $4 million and $25 million of additional funds are not reflected in the tables above as no incremental modifications have been made with those borrowers during the periods presented.  During the year ended December 31, 2014, no additional funds were subsequently loaned to a borrower whose terms had been modified in a TDR.TDRs in the Customer portfolio segment with a payment default during the years ended December 31, 2015, 2014 and 2013, which had been modified within twelve months prior to the default date, were as follows:(Dollars in millions) Year Ended December 31, 2015 Year Ended December 31, 2014 Year Ended December 31, 2013  Number ofContracts Post-TDRRecordedInvestment Number ofContracts Post-TDRRecordedInvestment Number ofContracts Post-TDRRecordedInvestmentNorth America 12 $1 11 $1 19 $4Europe — — 46 2 5 —Latin America 12 1 11 1 — —  Caterpillar Power Finance — — — — 2 3Total 24 $2 68 $4 26 $7              |

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| - Definition
The entire disclosure for financing receivables. Examples of financing receivables include, but are not limited to, loans, trade accounts receivables, notes receivable, credit cards, and receivables relating to a lessor's right(s) to payment(s) from a lease other than an operating lease that is recognized as assets.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 55 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=32702940&loc=SL6953791-111525Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e4975-111524
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| - References
No definition available.
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