| **Financing Activities (Tables)**                                          | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              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| **Receivables [Abstract]**                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               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| Impaired finance receivables                                               | Individually impaired finance receivables for the Customer portfolio segment were as follows:(Millions of dollars)            As of September 30, 2015 As of December 31, 2014Impaired Finance Receivables WithNo Allowance RecordedRecordedInvestment UnpaidPrincipalBalance RelatedAllowance RecordedInvestment UnpaidPrincipalBalance RelatedAllowanceCustomer           North America$10 $10 $— $14 $14 $—Europe43 42 — 44 43 —Asia/Pacific2 1 — 2 2 —Mining56 56 — 29 29 —Latin America31 31 — 34 34 —Caterpillar Power Finance191 191 — 129 128 —Total$333 $331 $— $252 $250 $—Impaired Finance Receivables WithAn Allowance Recorded           Customer           North America$13 $13 $3 $6 $6 $1Europe9 8 4 12 12 4Asia/Pacific48 48 9 29 29 8Mining13 13 5 138 137 9Latin America60 60 22 42 42 12Caterpillar Power Finance89 88 39 135 134 41Total$232 $230 $82 $362 $360 $75Total Impaired Finance Receivables           Customer           North America$23 $23 $3 $20 $20 $1Europe52 50 4 56 55 4Asia/Pacific50 49 9 31 31 8Mining69 69 5 167 166 9Latin America91 91 22 76 76 12Caterpillar Power Finance280 279 39 264 262 41Total$565 $561 $82 $614 $610 $75             (Millions of dollars)        Three Months EndedSeptember 30, 2015 Three Months EndedSeptember 30, 2014Impaired Finance Receivables With No AllowanceRecordedAverageRecordedInvestment InterestIncomeRecognized AverageRecordedInvestment InterestIncomeRecognizedCustomer       North America$10 $1 $19 $—Europe43 — 47 1Asia/Pacific1 — 1 —Mining63 — 29 —Latin America32 — 37 —Caterpillar Power Finance165 1 143 1Total$314 $2 $276 $2Impaired Finance Receivables With An AllowanceRecorded       Customer       North America$10 $— $10 $—Europe15 — 24 1Asia/Pacific63 — 26 —Mining9 — 127 2Latin America69 1 34 1Caterpillar Power Finance125 2 100 1Total$291 $3 $321 $5Total Impaired Finance Receivables       Customer       North America$20 $1 $29 $—Europe58 — 71 2Asia/Pacific64 — 27 —Mining72 — 156 2Latin America101 1 71 1Caterpillar Power Finance290 3 243 2Total$605 $5 $597 $7        (Millions of dollars)        Nine Months EndedSeptember 30, 2015 Nine Months EndedSeptember 30, 2014Impaired Finance Receivables With No AllowanceRecordedAverageRecordedInvestment InterestIncomeRecognized AverageRecordedInvestment InterestIncomeRecognizedCustomer       North America$12 $1 $22 $1Europe43 — 47 1Asia/Pacific2 — 4 —Mining80 3 82 3Latin America32 — 29 —Caterpillar Power Finance157 3 174 4Total$326 $7 $358 $9Impaired Finance Receivables With An AllowanceRecorded       Customer       North America$7 $— $10 $—Europe15 1 21 1Asia/Pacific42 1 19 1Mining47 1 75 4Latin America56 2 33 1Caterpillar Power Finance128 3 84 2Total$295 $8 $242 $9Total Impaired Finance Receivables       Customer       North America$19 $1 $32 $1Europe58 1 68 2Asia/Pacific44 1 23 1Mining127 4 157 7Latin America88 2 62 1Caterpillar Power Finance285 6 258 6Total$621 $15 $600 $18         |
| Investment in customer finance receivables on non-accrual status           | The investment in Customer finance receivables on non-accrual status was as follows: (Millions of dollars)    September 30, 2015 December 31, 2014Customer   North America$30 $27Europe46 28Asia/Pacific25 54Mining133 62Latin America260 201Caterpillar Power Finance114 96Total$608 $468                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           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| Aging related to finance receivables                                       | Aging related to finance receivables was as follows: (Millions of dollars)              September 30, 2015 31-60DaysPast Due 61-90DaysPast Due 91+DaysPast Due TotalPast Due Current TotalFinance Receivables 91+ Still AccruingCustomer             North America$46 $18 $29 $93 $7,723 $7,816 $4Europe29 11 48 88 2,399 2,487 7Asia/Pacific46 23 34 103 2,175 2,278 10Mining18 1 58 77 1,771 1,848 —Latin America42 42 204 288 1,919 2,207 —Caterpillar Power Finance6 — 47 53 3,119 3,172 6Dealer           North America— — — — 3,528 3,528 —Europe— — — — 400 400 —Asia/Pacific— — — — 584 584 —Mining— — — — 7 7 —Latin America— — — — 724 724 —Caterpillar Power Finance— — — — 3 3 —Caterpillar Purchased Receivables           North America21 5 2 28 1,461 1,489 2Europe2 1 6 9 341 350 —Asia/Pacific— — — — 369 369 —Mining— — — — — — —Latin America— — — — 323 323 —Caterpillar Power Finance— — — — 6 6 —Total$210 $101 $428 $739 $26,852 $27,591 $29               (Millions of dollars)              December 31, 2014 31-60DaysPast Due 61-90DaysPast Due 91+DaysPast Due TotalPast Due Current TotalFinanceReceivables 91+ Still AccruingCustomer             North America$46 $8 $27 $81 $7,291 $7,372 $4Europe16 23 29 68 2,607 2,675 6Asia/Pacific29 22 69 120 2,773 2,893 16Mining28 — 11 39 2,084 2,123 —Latin America55 23 196 274 2,583 2,857 8Caterpillar Power Finance1 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 America23 5 1 29 1,916 1,945 1Europe4 1 5 10 429 439 1Asia/Pacific— — — — 401 401 —Mining— — — — — — —Latin America6 5 — 11 420 431 —Caterpillar Power Finance— — 1 1 21 22 1Total$208 $91 $403 $702 $28,773 $29,475 $38                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| Allowance for credit losses and recorded investment in finance receivables | An analysis of the Allowance for credit losses was as follows:(Millions of dollars)        September 30, 2015Allowance for Credit Losses:Customer Dealer CaterpillarPurchased Receivables TotalBalance at beginning of year$388 $10 $3 $401Receivables written off(151) — — (151)Recoveries on receivables previously written off32 — — 32Provision for credit losses89 (1) — 88Adjustment due to sale of receivables(1) — — (1)Foreign currency translation adjustment(21) — — (21)Balance at end of period$336 $9 $3 $348        Individually evaluated for impairment$82 $— $— $82Collectively evaluated for impairment254 9 3 266Ending Balance$336 $9 $3 $348        Recorded Investment in Finance Receivables:       Individually evaluated for impairment$565 $— $— $565Collectively evaluated for impairment19,243 5,246 2,537 27,026Ending Balance$19,808 $5,246 $2,537 $27,591        (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 off47 — — 47Provision for credit losses136 — — 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 impairment313 10 3 326Ending Balance$388 $10 $3 $401        Recorded Investment in Finance Receivables:       Individually evaluated for impairment$614 $— $— $614Collectively evaluated for impairment20,454 5,169 3,238 28,861Ending Balance$21,068 $5,169 $3,238 $29,475                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| Recorded investment in performing and non-performing finance receivables   | The recorded investment in performing and non-performing finance receivables was as follows:(Millions of dollars)        September 30, 2015 Customer Dealer CaterpillarPurchased Receivables TotalPerforming       North America$7,786 $3,528 $1,489 $12,803Europe2,441 400 344 3,185Asia/Pacific2,253 584 369 3,206Mining1,715 7 — 1,722Latin America1,947 724 323 2,994Caterpillar Power Finance3,058 3 6 3,067Total Performing$19,200 $5,246 $2,531 $26,977Non-Performing       North America$30 $— $— $30Europe46 — 6 52Asia/Pacific25 — — 25Mining133 — — 133Latin America260 — — 260Caterpillar Power Finance114 — — 114Total Non-Performing$608 $— $6 $614Total Performing and Non-Performing       North America$7,816 $3,528 $1,489 $12,833Europe2,487 400 350 3,237Asia/Pacific2,278 584 369 3,231Mining1,848 7 — 1,855Latin America2,207 724 323 3,254Caterpillar Power Finance3,172 3 6 3,181Total$19,808 $5,246 $2,537 $27,591        (Millions of dollars)        December 31, 2014 Customer Dealer CaterpillarPurchased Receivables TotalPerforming       North America$7,345 $3,209 $1,945 $12,499Europe2,647 467 435 3,549Asia/Pacific2,839 637 401 3,877Mining2,061 3 — 2,064Latin America2,656 853 431 3,940Caterpillar Power Finance3,052 — 22 3,074Total Performing$20,600 $5,169 $3,234 $29,003Non-Performing       North America$27 $— $— $27Europe28 — 4 32Asia/Pacific54 — — 54Mining62 — — 62Latin America201 — — 201Caterpillar Power Finance96 — — 96Total Non-Performing$468 $— $4 $472Total Performing and Non-Performing       North America$7,372 $3,209 $1,945 $12,526Europe2,675 467 439 3,581Asia/Pacific2,893 637 401 3,931Mining2,123 3 — 2,126Latin America2,857 853 431 4,141Caterpillar Power Finance3,148 — 22 3,170Total$21,068 $5,169 $3,238 $29,475                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| Finance receivables modified as TDRs                                       | Finance receivables in the Customer portfolio segment modified as TDRs were as follows:(Dollars in millions)Three Months EndedSeptember 30, 2015 Three Months EndedSeptember 30, 2014 Number ofContracts Pre-TDRRecorded Investment Post-TDRRecorded Investment Number ofContracts Pre-TDRRecorded Investment Post-TDRRecorded InvestmentCustomer           North America6 $— $— 20 $9 $3Europe4 — — — — —Asia/Pacific1 1 1 — — —Mining2 15 14 45 122 124Latin America10 1 2 3 — —Caterpillar Power Finance8 93 79 7 44 46Total(1)31 $110 $96 75 $175 $173             Nine Months EndedSeptember 30, 2015 Nine Months EndedSeptember 30, 2014 Number ofContracts Pre-TDRRecorded Investment Post-TDRRecorded Investment Number ofContracts Pre-TDRRecorded Investment Post-TDRRecorded InvestmentCustomer           North America10 $1 $1 24 $11 $5Europe23 2 2 8 7 7Asia/Pacific21 26 26 — — —Mining2 15 14 47 165 157Latin America10 1 2 31 31 30Caterpillar Power Finance12 197 180 13 80 81Total(1)78 $242 $225 123 $294 $280            (1) Modifications 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.TDRs in the Customer portfolio segment with a payment default during the three and nine months ended September 30, 2015 and 2014, which had been modified within twelve months prior to the default date, were as follows:(Dollars in millions)Three Months EndedSeptember 30, 2015 Three Months EndedSeptember 30, 2014 Number ofContracts Post-TDRRecordedInvestment Number ofContracts Post-TDRRecordedInvestmentCustomer       North America5 $— 3 $—Europe— — 5 1Latin America— — 7 —Total5 $— 15 $1         Nine Months EndedSeptember 30, 2015 Nine Months EndedSeptember 30, 2014 Number ofContracts Post-TDRRecordedInvestment Number ofContracts Post-TDRRecordedInvestmentCustomer       North America10 $1 10 $1Europe— — 12 2Latin America1 — 7 —Total11 $1 29 $3                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
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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 financing receivables by credit quality indicator. The credit quality indicator is a statistic about the credit quality of financing receivables. Examples include, but not limited to, consumer credit risk scores, credit-rating-agency ratings, an entity's internal credit risk grades, loan-to-value ratios, collateral, collection experience and other internal metrics.
+ References
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| - Definition
Tabular disclosure of impaired financing receivables.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524
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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
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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