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SHAREHOLDERS' EQUITY (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Feb. 28, 2015
Aug. 31, 2011
Apr. 10, 2013
May 31, 2011
Shareholder's Equity              
Par value of common stock (in dollars per share) $ 1.00us-gaap_CommonStockParOrStatedValuePerShare $ 1.00us-gaap_CommonStockParOrStatedValuePerShare          
Authorized common stock (in shares) 800,000,000us-gaap_CommonStockSharesAuthorized 800,000,000us-gaap_CommonStockSharesAuthorized          
Dividend declared, per share of common stock (in dollars per share) $ 1.1550us-gaap_CommonStockDividendsPerShareDeclared $ 0.9650us-gaap_CommonStockDividendsPerShareDeclared $ 0.8300us-gaap_CommonStockDividendsPerShareDeclared        
Number of undesignated preferred stock designated as Series A Junior Participating Preferred Stock     400,000ecl_PreferredStockDesignatedAsSeriesAJuniorParticipatingPreferredStock        
Champion              
Shareholder's Equity              
Portion of consideration transferred and deposited in an escrow account to fund post-closing adjustments to the consideration and covenant and other indemnification obligations           $ 100ecl_BusinessCombinationPortionOfConsiderationTransferredToEscrowFundCommonStockValue
/ us-gaap_BusinessAcquisitionAxis
= ecl_ChampionMember
 
COMMON STOCK              
Shareholder's Equity              
Par value of common stock (in dollars per share) $ 1.00us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
$ 1.00us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
$ 1.00us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
       
Authorized common stock (in shares) 800,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
800,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
800,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
       
Dividend declared, per share of common stock (in dollars per share) $ 1.1550us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
$ 0.9650us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
$ 0.8300us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
       
Common stock, shares authorized to be repurchased             15,000,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
Common stock, shares reacquired through open and private market purchases 3,547,334us-gaap_TreasuryStockSharesAcquired
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
3,096,464us-gaap_TreasuryStockSharesAcquired
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
2,600,569us-gaap_TreasuryStockSharesAcquired
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
       
Shares authorized to be repurchased 9,166,298us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
           
Number of shares reacquired related to the withholding of taxes for the exercise of stock options and the vesting of stock awards 489,854ecl_CommonStockReacquiredRelatedToExerciseOfStockOptionsAndVestingOfStockAwardsNumberOfShares
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
346,941ecl_CommonStockReacquiredRelatedToExerciseOfStockOptionsAndVestingOfStockAwardsNumberOfShares
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
734,857ecl_CommonStockReacquiredRelatedToExerciseOfStockOptionsAndVestingOfStockAwardsNumberOfShares
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
       
COMMON STOCK | Subsequent event              
Shareholder's Equity              
Common stock, shares authorized to be repurchased       20,000,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Amount of common stock to be repurchased under ASR agreement       $ 300ecl_AcceleratedShareRepurchasesAgreementAmount
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
COMMON STOCK | Champion              
Shareholder's Equity              
Common stock, shares issued           6,596,444us-gaap_CommonStockSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= ecl_ChampionMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
 
Consideration transferred in the form of common stock, and deposited in an escrow fund to satisfy adjustments to consideration and indemnification obligations (in shares)           1,258,115ecl_BusinessCombinationConsiderationTransferredToEscrowFundCommonStock
/ us-gaap_BusinessAcquisitionAxis
= ecl_ChampionMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
 
Number of shares repurchased from escrow account   1,258,115ecl_SharesRepurchasedFromEscrowAccount
/ us-gaap_BusinessAcquisitionAxis
= ecl_ChampionMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
         
COMMON STOCK | Nalco              
Shareholder's Equity              
Additional shares authorized to be repurchased contingent upon merger         10,000,000ecl_StockRepurchaseProgramAdditionalNumberOfSharesAuthorizedToBeRepurchasedContingentUponMerger
/ us-gaap_BusinessAcquisitionAxis
= ecl_NalcoHoldingCompanyMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
   
Undesignated preferred stock              
Shareholder's Equity              
Preferred stock, shares authorized 15,000,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= ecl_UndesignatedPreferredStockMember
           
Remaining number of undesignated shares     14,600,000ecl_PreferredStockSharesUndesignated
/ us-gaap_StatementClassOfStockAxis
= ecl_UndesignatedPreferredStockMember