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STOCK INCENTIVE AND STOCK OPTION PLANS (Details) (USD $)
In Millions, except Share data, unless otherwise specified |
12 Months Ended | |||
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Dec. 31, 2014
option
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Dec. 31, 2013
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Dec. 31, 2012
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May 31, 2012
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| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | ||||
| Number of stock-based awards authorized to be granted to executives, employees and non-employee directors under the 2012 Omnibus Plant (in shares) | 3,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized | |||
| Stock options' expiration from the date of grant | 10 years | |||
| Stock options vesting period | 3 years | 2 years | ||
| Stock options granted for every even block of 100 KESIP shares purchased by the employee | 50cmi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsForBlocksOfKESIPShares | |||
| Number of shares in every even block of KESIP shares | 100us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction | |||
| Compensation expense (net of estimated forfeitures) | $ 35us-gaap_AllocatedShareBasedCompensationExpense | $ 34us-gaap_AllocatedShareBasedCompensationExpense | $ 35us-gaap_AllocatedShareBasedCompensationExpense | |
| Excess tax benefit / (deficiency) associated with share-based plans | 5us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | 13us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | 14us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | |
| Total unrecognized compensation expense (net of estimated forfeitures) | $ 32us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized | |||
| Weighted-average maximum period of recognition of total unrecognized compensation expense related to nonvested awards | 2 years | |||
| Performance Shares | ||||
| Share-based Compensation Arrangement by Share-based Payment Award | ||||
| Performance period | 3 years | |||
| Performance Shares | Minimum | ||||
| Share-based Compensation Arrangement by Share-based Payment Award | ||||
| Target award based on the actual ROE performance (as a percent) |
0.00%cmi_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfTargetAwardBasedOnActualROEPerformanceDuringTwoYearPeriod / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
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| Performance Shares | Maximum | ||||
| Share-based Compensation Arrangement by Share-based Payment Award | ||||
| Target award based on the actual ROE performance (as a percent) |
200.00%cmi_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfTargetAwardBasedOnActualROEPerformanceDuringTwoYearPeriod / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
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| Restricted Shares | ||||
| Share-based Compensation Arrangement by Share-based Payment Award | ||||
| Restricted shares released after two years (as a percent) |
33.33%cmi_ShareBasedCompensationArrangementByShareBasedPaymentAwardPortionOfSharesReleasedAfterTwoYears / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |
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| Period after which portion of issued restricted shares will be released | 2 years | |||
| Restricted shares released on the grant date each year after the first two years (as a percent) |
33.33%cmi_ShareBasedCompensationArrangementByShareBasedPaymentAwardPortionOfSharesReleasedEachYear / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |
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| Restriction period to recognize compensation expense | 4 years | |||
| X | ||||||||||
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- Definition
This element represents the period of time over which the entity's performance is evaluated for purposes of calculating the number of performance shares earned. No definition available.
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| X | ||||||||||
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- Definition
This element represents the stock options' expiration period from the date of grant. No definition available.
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- Definition
This element represents the stock options granted for every designated block of shares purchased by the employee during the period through a stock investment plan for key employees which allows certain employees, other than officers, to purchase shares of common stock on an installment basis up to an established credit limit. No definition available.
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| X | ||||||||||
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- Definition
Represents the percentage of target award based on the actual return on equity (ROE) performance during the two-year period. No definition available.
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- Definition
This element represents the period after which portion of issued shares will be released. Restrictions limit the sale or transfer of the shares during a defined period. No definition available.
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- Definition
This element represents the portion of issued shares that are released after two years. Restrictions limit the sale or transfer of the shares during a defined period. No definition available.
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- Definition
This element represents the portion of issued shares that are released each year after the first two years on the anniversary of the grant date. No definition available.
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- Definition
This element represents the restriction period of compensation expense recognized on a straight line basis. No definition available.
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| X | ||||||||||
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- Definition
Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Unrecognized cost of unvested share-based compensation awards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The number of shares issued or sold by the subsidiary or equity method investee per stock transaction. No definition available.
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- Definition
Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Details
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