| **Finance Receivables (Tables)**                                                             | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
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| **Receivables [Abstract]**                                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| Summary of finance receivables included in the Consolidated Statements of Financial Position | A 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 finance receivables                                                            | 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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| Allowance for credit losses and recorded investment in finance receivables                   | 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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| Aging related to finance receivables                                                         | 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 receivables                                                                 | 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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| Investment in Customer finance receivables on non-accrual status                             | 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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| Finance receivables modified as TDRs                                                         | 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
Tabular disclosure of financing receivables (examples of financing receivables include loans, trade accounts receivable and notes receivable) and activity in the allowance for credit losses account.
+ References
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| - Definition
Tabular disclosure of impaired financing receivables.
+ References
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| - Definition
Tabular disclosure of financing receivables that are past due but not impaired, financing receivables that are 90 days past due and still accruing, and financing receivables on nonaccrual status.
+ References
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| - References
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| - Definition
Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables.
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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682
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| - Definition
Tabular disclosure of the annual minimum payments due from financing receivables, such as, but not limited to accounts, notes, loans, and other financing receivables.
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No definition available.
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| - Definition
Tabular disclosure of nonaccrual and past due financing receivables (such as loans and trade receivables), including: (a) the recorded investment in loans and trade receivables, if applicable, on nonaccrual status as of each balance sheet date (b) the recorded investment in loans and trade receivables, if applicable, past due 90 days or more and still accruing.
+ References
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| - Definition
Tabular disclosure of financing receivables and troubled debt restructurings.
+ References
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