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STOCK INCENTIVE PLANS (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended 1 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2010
Mar. 31, 2015
Stock incentive plans        
Stock-based compensation expense $ 3us-gaap_AllocatedShareBasedCompensationExpense $ 4us-gaap_AllocatedShareBasedCompensationExpense    
Restricted stock units        
Unrecognized compensation expense        
Remaining unrecognized compensation expense associated with unvested shares or units $ 20us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
    20us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Weighted average period for recognition 2 years      
2010 LTIP        
Stock incentive plans        
Number of shares available for issuance     11us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= chmt_LongTermIncentivePlan2010Member
 
2010 LTIP | Maximum        
Stock incentive plans        
Expiration period     10 years  
2015 Awards | Time-based RSU        
Stock incentive plans        
Grants approved (in shares)       0.2chmt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodApproved
/ us-gaap_AwardTypeAxis
= chmt_TimeBasedRestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= chmt_LongTermIncentiveAwards2015Member
Vesting period       3 years
2015 Awards | Performance-based RSU        
Stock incentive plans        
Performance multiplier       2chmt_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceMultiplierForGrants
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= chmt_LongTermIncentiveAwards2015Member
Grants approved (in shares)       0.2chmt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodApproved
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= chmt_LongTermIncentiveAwards2015Member
Vesting period       3 years
Weighted average fair value of options granted (in dollars per share)       34.91us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= chmt_LongTermIncentiveAwards2015Member