| **Financing Activities (Tables)**                                                                             | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    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| **Receivables [Abstract]**                                                                                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            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| Impaired loans and finance leases                                                                             | Individually impaired loans and finance leases for the customer portfolio segment were as follows:(Millions of dollars)            As of September 30, 2012 As of December 31, 2011Impaired Loans and Finance Leases WithNo Allowance RecordedRecordedInvestment UnpaidPrincipalBalance RelatedAllowance RecordedInvestment(1) UnpaidPrincipalBalance(1) RelatedAllowanceCustomer           North America$42 $41 $— $83 $80 $—Europe44 44 — 47 46 —Asia/Pacific4 4 — 4 4 —Mining9 9 — 8 8 —Latin America7 7 — 9 9 —Caterpillar Power Finance269 268 — 175 170 —Total$375 $373 $— $326 $317 $—Impaired Loans and Finance Leases WithAn Allowance Recorded           Customer           North America$38 $34 $9 $69 $64 $15Europe50 48 17 36 33 12Asia/Pacific34 34 7 13 13 3Mining68 67 7 13 13 4Latin America53 53 17 25 25 6Caterpillar Power Finance112 110 18 93 92 16Total$355 $346 $75 $249 $240 $56Total Impaired Loans and Finance Leases           Customer           North America$80 $75 $9 $152 $144 $15Europe94 92 17 83 79 12Asia/Pacific38 38 7 17 17 3Mining77 76 7 21 21 4Latin America60 60 17 34 34 6Caterpillar Power Finance381 378 18 268 262 16Total$730 $719 $75 $575 $557 $56            (1)Amounts previously disclosed have been revised due to immaterial errors. (Millions of dollars)        Three Months EndedSeptember 30, 2012 Three Months EndedSeptember 30, 2011Impaired Loans and Finance Leases With No AllowanceRecordedAverageRecordedInvestment InterestIncomeRecognized AverageRecordedInvestment(1) InterestIncomeRecognizedCustomer       North America$42 $1 $91 $1Europe45 — 10 —Asia/Pacific3 — 5 1Mining9 — 8 —Latin America6 — 11 —Caterpillar Power Finance220 1 240 —Total$325 $2 $365 $2        Impaired Loans and Finance Leases With An AllowanceRecorded       Customer       North America$51 $— $126 $—Europe44 1 44 1Asia/Pacific29 — 9 —Mining68 1 10 —Latin America58 1 40 —Caterpillar Power Finance110 — 126 —Total$360 $3 $355 $1        Total Impaired Loans and Finance Leases       Customer       North America$93 $1 $217 $1Europe89 1 54 1Asia/Pacific32 — 14 1Mining77 1 18 —Latin America64 1 51 —Caterpillar Power Finance330 1 366 —Total$685 $5 $720 $3        (1)Amounts previously disclosed have been revised due to immaterial errors.(Millions of dollars)        Nine Months EndedSeptember 30, 2012 Nine Months EndedSeptember 30, 2011Impaired Loans and Finance Leases With No AllowanceRecordedAverageRecordedInvestment InterestIncomeRecognized AverageRecordedInvestment(1) InterestIncomeRecognizedCustomer       North America$56 $2 $93 $3Europe45 — 8 —Asia/Pacific3 — 5 1Mining8 — 8 —Latin America6 — 8 —Caterpillar Power Finance204 3 234 1Total$322 $5 $356 $5        Impaired Loans and Finance Leases With An AllowanceRecorded       Customer       North America$63 $1 $160 $4Europe42 1 53 2Asia/Pacific24 1 18 1Mining41 2 4 —Latin America42 2 44 2Caterpillar Power Finance94 — 79 —Total$306 $7 $358 $9        Total Impaired Loans and Finance Leases       Customer       North America$119 $3 $253 $7Europe87 1 61 2Asia/Pacific27 1 23 2Mining49 2 12 —Latin America48 2 52 2Caterpillar Power Finance298 3 313 1Total$628 $12 $714 $14        (1)Amounts previously disclosed have been revised due to immaterial errors.  |
| Investment in loans and finace leases on non-accrual status                                                   | The investment in customer loans and finance leases on non-accrual status was as follows: (Millions of dollars)    September 30, 2012 December 31, 2011Customer   North America$77 $112Europe44 58Asia/Pacific40 24Mining12 12Latin America150 108Caterpillar Power Finance286 158Total$609 $472                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           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| Aging related to loans and finance leases                                                                     | Aging related to loans and finance leases was as follows: (Millions of dollars)              September 30, 2012 31-60DaysPast Due 61-90DaysPast Due 91+DaysPast Due TotalPast Due Current TotalFinance Receivables 91+ Still AccruingCustomer             North America$35 $9 $76 $120 $5,716 $5,836 $—Europe28 12 44 84 2,371 2,455 5Asia/Pacific76 22 51 149 3,366 3,515 17Mining2 — 12 14 1,825 1,839 —Latin America57 25 136 218 2,478 2,696 —Caterpillar Power Finance17 47 154 218 2,945 3,163 12Dealer           North America— — — — 2,759 2,759 —Europe— — — — 487 487 —Asia/Pacific— — — — 923 923 —Mining— — — — 1 1 —Latin America— — — — 892 892 —Caterpillar Power Finance— — — — — — —Caterpillar Purchased Receivables           North America20 5 1 26 1,597 1,623 1Europe1 — — 1 386 387 —Asia/Pacific— — — — 516 516 —Mining— — — — — — —Latin America— — — — 394 394 —Caterpillar Power Finance5 1 — 6 24 30 —Total$241 $121 $474 $836 $26,680 $27,516 $35               (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 losses and recorded investment in finance receivables                                    | The Allowance for credit losses as of September 30, 2012 and December 31, 2011 was as follows:(Millions of dollars)        September 30, 2012Allowance for Credit Losses:Customer Dealer CaterpillarPurchased Receivables TotalBalance at beginning of year$360 $6 $3 $369Receivables written off(92) — — (92)Recoveries on receivables previously written off36 — — 36Provision for credit losses90 1 — 91Adjustment due to sale of receivables(1) — — (1)Foreign currency translation adjustment1 — — 1Balance at end of period$394 $7 $3 $404        Individually evaluated for impairment$75 $— $— $75Collectively evaluated for impairment319 7 3 329Ending Balance$394 $7 $3 $404        Recorded Investment in Finance Receivables:       Individually evaluated for impairment$730 $— $— $730Collectively evaluated for impairment18,774 5,062 2,950 26,786Ending Balance$19,504 $5,062 $2,950 $27,516         (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.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| 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, 2012 Customer Dealer CaterpillarPurchased Receivables TotalPerforming       North America$5,759 $2,759 $1,623 $10,141Europe2,411 487 387 3,285Asia/Pacific3,475 923 516 4,914Mining1,827 1 — 1,828Latin America2,546 892 394 3,832Caterpillar Power Finance2,877 — 30 2,907Total Performing$18,895 $5,062 $2,950 $26,907Non-Performing       North America$77 $— $— $77Europe44 — — 44Asia/Pacific40 — — 40Mining12 — — 12Latin America150 — — 150Caterpillar Power Finance286 — — 286Total Non-Performing$609 $— $— $609Total Performing and Non-Performing       North America$5,836 $2,759 $1,623 $10,218Europe2,455 487 387 3,329Asia/Pacific3,515 923 516 4,954Mining1,839 1 — 1,840Latin America2,696 892 394 3,982Caterpillar Power Finance3,163 — 30 3,193Total$19,504 $5,062 $2,950 $27,516         (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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| Loan and finance receivables modified as TDRs                                                                 | Loan and finance lease receivables in the customer portfolio segment modified as TDRs during the three and nine months ended September 30, 2012 and 2011, were as follows:(Dollars in millions)            Three Months EndedSeptember 30, 2012 Three Months EndedSeptember 30, 2011 Number ofContracts Pre-TDROutstandingRecorded Investment Post-TDROutstandingRecorded Investment Number ofContracts Pre-TDROutstandingRecorded Investment Post-TDROutstandingRecorded InvestmentCustomer           North America17 $4 $4 14 $2 $2Europe14 1 1 — — —Asia/Pacific12 3 3 — — —Mining— — — — — —Latin America— — — — — —  Caterpillar Power Finance (1) (2)15 151 151 — — —Total(3)58 $159 $159 14 $2 $2             Nine Months EndedSeptember 30, 2012 Nine Months EndedSeptember 30, 2011 Number ofContracts Pre-TDROutstandingRecorded Investment Post-TDROutstandingRecorded Investment Number ofContracts Pre-TDROutstandingRecorded Investment Post-TDROutstandingRecorded InvestmentCustomer           North America58 $8 $8 53 $11 $11Europe21 8 8 6 7 7Asia/Pacific12 3 3 — — —Mining— — — — — —Latin America— — — 12 10 10  Caterpillar Power Finance (1) (2)20 183 183 31 113 113Total(3)111 $202 $202 102 $141 $141            (1) Four customers comprise $148 million of the $151 million pre-TDR and post-TDR outstanding recorded investment for the three months ended September 30, 2012.  Seven customers comprise $180 million of the $183 million pre-TDR and post-TDR outstanding recorded investment for the nine months ended September 30, 2012.  Three customers comprise $104 million of the $113 million pre-TDR and post-TDR outstanding recorded investment for the nine months ended September 30, 2011.(2) During the three and nine months ended September 30, 2012, $4 million and $22 million, respectively, of additional funds were subsequently loaned to a borrower whose terms had been modified in a TDR.  The $4 million and $22 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 September 30, 2012, remaining commitments to lend additional funds to a borrower whose terms have been modified in a TDR were $3 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 | TDRs in the customer portfolio segment with a payment default during the three and nine months ended September 30, 2012 and 2011, which had been modified within twelve months prior to the default date, were as follows:(Dollars in millions)        Three Months EndedSeptember 30, 2012 Three Months EndedSeptember 30, 2011 Number ofContracts Post-TDRRecordedInvestment Number ofContracts Post-TDRRecordedInvestmentCustomer       North America8 $1 3 $16Europe— — — —Asia/Pacific2 1 — —Mining— — — —Latin America— — 7 4Caterpillar Power Finance— — 5 65Total10 $2 15 $85         Nine Months EndedSeptember 30, 2012 Nine Months EndedSeptember 30, 2011 Number ofContracts Post-TDRRecordedInvestment Number ofContracts Post-TDRRecordedInvestmentCustomer       North America39 $3 44 $25Europe— — 1 1Asia/Pacific2 1 — —Mining— — — —Latin America— — 7 4Caterpillar Power Finance16 21 14 70Total57 $25 66 $100                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         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| - Definition
Tabular disclosure of recorded investment in performing and non-performing financing receivables (such as loans and finance leases).
+ References
No definition available.
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| - Definition
Tabular disclosure of troubled debt restructurings with a payment default that had been modified within twelve months.
+ References
No definition available.
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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
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524
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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
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5111-111524Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953401-111524
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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
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5111-111524
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| - Definition
Tabular disclosure of financing receivables and troubled debt restructurings.
+ References
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