2.2.0.25falsefalse4020 - Disclosure - Stock-based Compensation (Details)truefalseIn Millions, except Share data, unless otherwise specifiedfalse1falsefalseUSDfalsefalse1/1/2010 - 12/31/2010
USD ($)
USD ($) / shares
$D2010http://www.sec.gov/CIK0000018230duration2010-01-01T00:00:002010-12-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDPerShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2falsefalseUSDfalsefalse1/1/2009 - 12/31/2009
USD ($)
USD ($) / shares
$D2009http://www.sec.gov/CIK0000018230duration2009-01-01T00:00:002009-12-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDPerShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$3falsefalseUSDfalsefalse1/1/2008 - 12/31/2008
USD ($)
USD ($) / shares
$D2008http://www.sec.gov/CIK0000018230duration2008-01-01T00:00:002008-12-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDPerShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$3true0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse4false0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRateus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truetruefalse0.0230.023falsefalsefalsefalsefalse2truetruefalse0.0310.031falsefalsefalsefalsefalse3truetruefalse0.0190.019falsefalsefalsefalsefalseOtherus-types:percentItemTypepureThe estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph e(2)(c)
falsefalse5false0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRateus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truetruefalse0.3640.364falsefalsefalsefalsefalse2truetruefalse0.3600.360falsefalsefalsefalsefalse3truetruefalse0.2710.271falsefalsefalsefalsefalseOtherus-types:percentItemTypepureAn entity using a valuation technique with different volatilities during the contractual term must disclose the range of expected volatilities used and the weighted-average expected volatility.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph e(2)(b)
falsefalse6false0cat_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsVolatilitiesLowEndOfRangecatfalsenadurationLow end of the range of expected volatilities used in valuation techniques when valuing share-based payment awards.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truetruefalse0.3520.352falsefalsefalsefalsefalse2truetruefalse0.3580.358falsefalsefalsefalsefalse3truetruefalse0.2710.271falsefalsefalsefalsefalseOtherus-types:percentItemTypepureLow end of the range of expected volatilities used in valuation techniques when valuing share-based payment awards.No authoritative reference available.falsefalse7false0cat_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsVolatilitiesHighEndOfRangecatfalsenadurationHigh end of the range of expected volatilities used in valuation techniques when valuing share-based payment awards.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truetruefalse0.5180.518falsefalsefalsefalsefalse2truetruefalse0.6100.610falsefalsefalsefalsefalse3truetruefalse0.2900.290falsefalsefalsefalsefalseOtherus-types:percentItemTypepureHigh end of the range of expected volatilities used in valuation techniques when valuing share-based payment awards.No authoritative reference available.falsefalse8false0cat_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateLowEndOfRangecatfalsenadurationLow end of the range of risk-free interest rates used in valuation techniques when valuing share-based payment awards.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truetruefalse0.00320.0032falsefalsefalsefalsefalse2truetruefalse0.00170.0017falsefalsefalsefalsefalse3truetruefalse0.01600.0160falsefalsefalsefalsefalseOtherus-types:percentItemTypepureLow end of the range of risk-free interest rates used in valuation techniques when valuing share-based payment awards.No authoritative reference available.falsefalse9false0cat_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateHighEndOfRangecatfalsenadurationHigh end of the range of risk-free interest rates used in valuation techniques when valuing share-based payment awards.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truetruefalse0.03610.0361falsefalsefalsefalsefalse2truetruefalse0.02990.0299falsefalsefalsefalsefalse3truetruefalse0.03640.0364falsefalsefalsefalsefalseOtherus-types:percentItemTypepureHigh end of the range of risk-free interest rates used in valuation techniques when valuing share-based payment awards.No authoritative reference available.falsefalse10false0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTermus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse77falsefalsefalsefalsefalse2truefalsefalse88falsefalsefalsefalsefalse3truefalsefalse88falsefalsefalsefalsefalseOtherxbrli:decimalItemTypedecimalThe period of time a share-based award is expected to be outstanding. A share-based award's expected term shall be determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior. An entity is required to aggregate individual awards into relatively homogeneous groups.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph e(2)(a)
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section D
-Subsection 2
falsefalse11false0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse134000000134falsetruefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryAs of the balance-sheet date, the aggregate unrecognized cost of share-based awards made to employees under share-based compensation plans that have yet to vest.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph h
falsefalse12false0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognitionus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse1.91.9falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:decimalItemTypedecimalThe weighted average period over which unrecognized compensation is expected to be recognized for share-based compensation plans, using a decimal to express in number of years.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph h
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph a
falsefalse15false0cat_ShareBasedCompensationArrangementByShareBasedPaymentAwardTermLifecatfalsenadurationThis element represents the term life of stock appreciation rights and options from the date of grant.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse1010falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:decimalItemTypedecimalThis element represents the term life of stock appreciation rights and options from the date of grant.No authoritative reference available.falsefalse16false0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardTermsOfAwardus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00Upon separation from service, if the participant is 55 years of age or older with more than ten years of service, the participant meets the criteria for a "Long Service Separation." If the "Long Service Separation" criteria are met, the vested options/SARs will have a life that is the lesser of 10 years from the original grant date or five years from the separation date. Our stock-based compensation plans allow for the immediate vesting upon separation for employees who meet the criteria for a "Long Service Separation" and who have fulfilled the requisite service period of six months.Upon separation from service, if the participant is 55 years of age or older with more than ten years of service, the participant meets the criteria for afalsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringDescription of pertinent provisions of share based compensation awards that have actual or potential impact upon the company's financial statements.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph a
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forward is a reconciliation of a concept from the beginning of a period to the end of a period.falsefalse25false0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumberus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsetruefalsefalseperiodstartlabel1truefalsefalse45315454531545falsefalsefalsefalsefalse2truefalsefalse26734742673474falsefalsefalsefalsefalse3truefalsefalse12533261253326falsefalsefalsefalsefalseSharesxbrli:sharesItemTypesharesThe number of outstanding awards on nonstock option plans (for example, phantom stock plan, stock appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph b(2)(a)
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph b(2)(b)
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph b(2)(d)
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph b(2)(e)
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph b(2)(a)
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph b(2)(b)
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