| **Financing Activities (Tables)**                                                                             | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         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| **Financing Activities [Abstract]**                                                                           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     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| Impaired loans and finance leases                                                                             | (Millions of dollars)            As of June 30, 2012 As of December 31, 2011Impaired Loans and Finance Leases WithNo Allowance Recorded(1)RecordedInvestment UnpaidPrincipalBalance RelatedAllowance RecordedInvestment(2) UnpaidPrincipalBalance(2) RelatedAllowanceCustomer           North America$46 $44 $— $83 $80 $—Europe45 44 — 47 46 —Asia/Pacific3 3 — 4 4 —Mining8 8 — 8 8 —Latin America5 5 — 9 9 —Caterpillar Power Finance175 174 — 175 170 —Total$282 $278 $— $326 $317 $—Impaired Loans and Finance Leases WithAn Allowance Recorded           Customer           North America$58 $53 $12 $69 $64 $15Europe38 38 11 36 33 12Asia/Pacific28 28 4 13 13 3Mining69 68 7 13 13 4Latin America45 45 7 25 25 6Caterpillar Power Finance112 108 20 93 92 16Total$350 $340 $61 $249 $240 $56Total Impaired Loans and Finance Leases           Customer           North America$104 $97 $12 $152 $144 $15Europe83 82 11 83 79 12Asia/Pacific31 31 4 17 17 3Mining77 76 7 21 21 4Latin America50 50 7 34 34 6Caterpillar Power Finance287 282 20 268 262 16Total$632 $618 $61 $575 $557 $56            (1)There was no related allowance for credit losses due to sufficient collateral value.(2)Amounts previously disclosed have been revised due to immaterial errors. (Millions of dollars)        Three Months EndedJune 30, 2012 Three Months EndedJune 30, 2011Impaired Loans and Finance Leases With No AllowanceRecorded(1)AverageRecordedInvestment InterestIncomeRecognized AverageRecordedInvestment(2) InterestIncomeRecognizedCustomer       North America$57 $— $104 $1Europe45 — 8 —Asia/Pacific3 — 6 —Mining8 — 8 —Latin America5 — 10 —Caterpillar Power Finance203 1 261 —Total$321 $1 $397 $1        Impaired Loans and Finance Leases With An AllowanceRecorded       Customer       North America$66 $1 $162 $2Europe40 — 53 —Asia/Pacific24 — 18 1Mining41 1 — —Latin America40 1 46 1Caterpillar Power Finance86 — 72 —Total$297 $3 $351 $4        Total Impaired Loans and Finance Leases       Customer       North America$123 $1 $266 $3Europe85 — 61 —Asia/Pacific27 — 24 1Mining49 1 8 —Latin America45 1 56 1Caterpillar Power Finance289 1 333 —Total$618 $4 $748 $5        (1)There was no related allowance for credit losses due to sufficient collateral value. (2)Amounts previously disclosed have been revised due to immaterial errors.(Millions of dollars)        Six Months EndedJune 30, 2012 Six Months EndedJune 30, 2011Impaired Loans and Finance Leases With No AllowanceRecorded(1)AverageRecordedInvestment InterestIncomeRecognized AverageRecordedInvestment(2) InterestIncomeRecognizedCustomer       North America$63 $1 $97 $2Europe45 — 7 —Asia/Pacific3 — 5 —Mining8 — 8 —Latin America6 — 7 —Caterpillar Power Finance191 2 231 1Total$316 $3 $355 $3        Impaired Loans and Finance Leases With An AllowanceRecorded       Customer       North America$69 $1 $176 $4Europe40 — 58 1Asia/Pacific22 1 22 1Mining29 1 — —Latin America33 1 46 2Caterpillar Power Finance87 — 59 —Total$280 $4 $361 $8        Total Impaired Loans and Finance Leases       Customer       North America$132 $2 $273 $6Europe85 — 65 1Asia/Pacific25 1 27 1Mining37 1 8 —Latin America39 1 53 2Caterpillar Power Finance278 2 290 1Total$596 $7 $716 $11        (1)There was no related allowance for credit losses due to sufficient collateral value.(2)Amounts previously disclosed have been revised due to immaterial errors.  |
| Investment in customer loans and finace leases on non-accrual status                                          | (Millions of dollars)    June 30, 2012 December 31, 2011Customer   North America$92 $112Europe48 58Asia/Pacific30 24Mining12 12Latin America169 108Caterpillar Power Finance297 158Total$648 $472                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          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| Aging related to loans and finance leases                                                                     | (Millions of dollars)              June 30, 2012 31-60DaysPast Due 61-90DaysPast Due 91+DaysPast Due TotalPast Due Current TotalFinance Receivables 91+ Still AccruingCustomer             North America$41 $17 $89 $147 $5,572 $5,719 $1Europe32 27 56 115 2,204 2,319 10Asia/Pacific82 29 42 153 3,209 3,362 15Mining4 — 12 16 1,708 1,724 —Latin America45 23 157 225 2,354 2,579 —Caterpillar Power Finance83 32 177 292 2,876 3,168 14Dealer           North America— — — — 2,411 2,411 —Europe— — — — 425 425 —Asia/Pacific— — — — 991 991 —Mining— — — — 1 1 —Latin America— — — — 891 891 —Caterpillar Power Finance— — — — — — —Caterpillar Purchased Receivables           North America16 4 1 21 1,802 1,823 1Europe1 — — 1 383 384 —Asia/Pacific— — — — 418 418 —Mining— — — — — — —Latin America— — — — 473 473 —Caterpillar Power Finance2 — — 2 26 28 —Total$306 $132 $534 $972 $25,744 $26,716 $41               (Millions of dollars)              December 31, 2011 31-60DaysPast Due 61-90DaysPast Due 91+DaysPast Due TotalPast Due Current TotalFinanceReceivables 91+ Still AccruingCustomer             North America$75 $39 $111 $225 $5,448 $5,673 $9Europe27 11 57 95 2,129 2,224 10Asia/Pacific48 23 38 109 3,102 3,211 14Mining— — 12 12 1,473 1,485 —Latin America32 15 99 146 2,339 2,485 —Caterpillar Power Finance14 16 125 155 2,765 2,920 25Dealer           North America— — 2 2 2,412 2,414 2Europe— — — — 334 334 —Asia/Pacific— — — — 516 516 —Mining— — — — — — —Latin America— — — — 709 709 —Caterpillar Power Finance— — — — — — —Caterpillar Purchased Receivables           North America25 4 6 35 1,801 1,836 6Europe3 — — 3 399 402 —Asia/Pacific— — — — 465 465 —Mining— — — — — — —Latin America— — — — 422 422 —Caterpillar Power Finance— — — — 29 29 —Total$224 $108 $450 $782 $24,343 $25,125 $66                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| Allowance for credit loss activity and recorded investment in finance receivables                             | (Millions of dollars)        June 30, 2012Allowance for Credit Losses:Customer Dealer CaterpillarPurchased Receivables TotalBalance at beginning of year$360 $6 $3 $369Receivables written off(50) — — (50)Recoveries on receivables previously written off23 — — 23Provision for credit losses51 2 — 53Adjustment due to sale of receivables(1) — — (1)Foreign currency translation adjustment(1) — — (1)Balance at end of period$382 $8 $3 $393        Individually evaluated for impairment$61 $— $— $61Collectively evaluated for impairment321 8 3 332Ending Balance$382 $8 $3 $393        Recorded Investment in Finance Receivables:       Individually evaluated for impairment$632 $— $— $632Collectively evaluated for impairment18,239 4,719 3,126 26,084Ending Balance$18,871 $4,719 $3,126 $26,716         (Millions of dollars)        December 31, 2011Allowance for Credit Losses:Customer Dealer CaterpillarPurchased Receivables TotalBalance at beginning of year$357 $5 $1 $363Receivables written off(210) — — (210)Recoveries on receivables previously written off52 — — 52Provision for credit losses167 1 2 170Adjustment due to sale of receivables(3) — — (3)Foreign currency translation adjustment(3) — — (3)Balance at end of year$360 $6 $3 $369        Individually evaluated for impairment$56 $— $— $56Collectively evaluated for impairment304 6 3 313Ending Balance$360 $6 $3 $369        Recorded Investment in Finance Receivables(1):       Individually evaluated for impairment$575 $— $— $575Collectively evaluated for impairment17,423 3,973 3,154 24,550Ending Balance$17,998 $3,973 $3,154 $25,125        (1)Amounts previously disclosed for the customer segment have been revised due to immaterial errors.                                                                                                                                                                                               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| Recorded investment in performing and non-performing finance receivables                                      | (Millions of dollars)        June 30, 2012 Customer Dealer CaterpillarPurchased Receivables TotalPerforming       North America$5,627 $2,411 $1,823 $9,861Europe2,271 425 384 3,080Asia/Pacific3,332 991 418 4,741Mining1,712 1 — 1,713Latin America2,410 891 473 3,774Caterpillar Power Finance2,871 — 28 2,899Total Performing$18,223 $4,719 $3,126 $26,068Non-Performing       North America$92 $— $— $92Europe48 — — 48Asia/Pacific30 — — 30Mining12 — — 12Latin America169 — — 169Caterpillar Power Finance297 — — 297Total Non-Performing$648 $— $— $648Total Performing and Non-Performing       North America$5,719 $2,411 $1,823 $9,953Europe2,319 425 384 3,128Asia/Pacific3,362 991 418 4,771Mining1,724 1 — 1,725Latin America2,579 891 473 3,943Caterpillar Power Finance3,168 — 28 3,196Total$18,871 $4,719 $3,126 $26,716         (Millions of dollars)        December 31, 2011 Customer Dealer CaterpillarPurchased Receivables TotalPerforming       North America$5,561 $2,414 $1,836 $9,811Europe2,166 334 402 2,902Asia/Pacific3,187 516 465 4,168Mining1,473 — — 1,473Latin America2,377 709 422 3,508Caterpillar Power Finance2,762 — 29 2,791Total Performing$17,526 $3,973 $3,154 $24,653Non-Performing       North America$112 $— $— $112Europe58 — — 58Asia/Pacific24 — — 24Mining12 — — 12Latin America108 — — 108Caterpillar Power Finance158 — — 158Total Non-Performing$472 $— $— $472Total Performing and Non-Performing       North America$5,673 $2,414 $1,836 $9,923Europe2,224 334 402 2,960Asia/Pacific3,211 516 465 4,192Mining1,485 — — 1,485Latin America2,485 709 422 3,616Caterpillar Power Finance2,920 — 29 2,949Total$17,998 $3,973 $3,154 $25,125                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| Schedule of troubled debt restructurings                                                                      | (Dollars in millions)            Three Months EndedJune 30, 2012 Three Months EndedJune 30, 2011 Number ofContracts Pre-TDROutstandingRecorded Investment Post-TDROutstandingRecorded Investment Number ofContracts Pre-TDROutstandingRecorded Investment Post-TDROutstandingRecorded InvestmentCustomer           North America18 $2 $2 15 $4 $4Europe— — — 5 6 6Asia/Pacific— — — — — —Mining— — — — — —Latin America— — — 4 5 5  Caterpillar Power Finance (1) (2)— — — 25 60 60Total(3)18 $2 $2 49 $75 $75             Six Months EndedJune 30, 2012 Six Months EndedJune 30, 2011 Number ofContracts Pre-TDROutstandingRecorded Investment Post-TDROutstandingRecorded Investment Number ofContracts Pre-TDROutstandingRecorded Investment Post-TDROutstandingRecorded InvestmentCustomer           North America41 $4 $4 39 $9 $9Europe7 7 7 6 7 7Asia/Pacific— — — — — —Mining— — — — — —Latin America— — — 12 10 10  Caterpillar Power Finance (1) (2)5 32 32 31 113 113Total(3)53 $43 $43 88 $139 $139            (1)Two customers comprise $55 million of the $60 million pre-TDR and post-TDR outstanding recorded investment for the three months ended June 30, 2011.  Three customers comprise the $32 million pre-TDR and post-TDR outstanding recorded investment for the six months ended June 30, 2012.  Four customers comprise $105 million of the $113 million pre-TDR and post-TDR outstanding recorded investment for the six months ended June 30, 2011.(2)During the three and six months ended June 30, 2012, $6 million and $15 million, respectively, of additional funds were subsequently loaned to a borrower whose terms had been modified in a TDR.  The $6 million and $15 million of additional funds are not reflected in the tables above as no incremental modifications have been made with the borrower during the periods presented.  At June 30, 2012, remaining commitments to lend additional funds to a borrower whose terms have been modified in a TDR were $7 million.(3)Modifications include extended contract maturities, inclusion of interest only periods, below market interest rates, and extended skip payment periods.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| Customer's TDR's with a payment default that had been modified within twelve months prior to the default date | (Dollars in millions)        Three Months EndedJune 30, 2012 Three Months EndedJune 30, 2011 Number ofContracts Post-TDRRecordedInvestment Number ofContracts Post-TDRRecordedInvestmentCustomer       North America14 $1 7 $3Europe— — 1 1Asia/Pacific— — — —Mining— — — —Latin America— — — —Caterpillar Power Finance2 2 — —Total16 $3 8 $4         Six Months EndedJune 30, 2012 Six Months EndedJune 30, 2011 Number ofContracts Post-TDRRecordedInvestment Number ofContracts Post-TDRRecordedInvestmentCustomer       North America25 $2 41 $9Europe— — 1 1Asia/Pacific— — — —Mining— — — —Latin America— — — —Caterpillar Power Finance(1)16 21 6 5Total41 $23 48 $15        (1)Two customers comprise $19 million of the $21 million post-TDR recorded investment for the six months ended June 30, 2012.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                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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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Tabular disclosure of impaired financing receivables.
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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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| - 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.
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| - Definition
Tabular disclosure of financing receivables and troubled debt restructurings.
+ References
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