Maximum borrowing capacity under the entity's commercial paper program.

No definition available.

Name:	ecl_CommercialPaperMaximumBorrowingCapacity
Namespace Prefix:	ecl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under letters of credit, surety bonds and guarantees.

+ References

No definition available.

+ Details

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Namespace Prefix:	ecl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The total amount of the obligation under letters of credit, surety bonds and guarantees outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	ecl_LettersOfCreditSuretyBondsAndGuaranteesOutstandingAmount
Namespace Prefix:	ecl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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+ Details

Name:	us-gaap_CommercialPaper
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

+ References

+ Details

Name:	us-gaap_DebtCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt and lease obligation, classified as current.

+ References

+ Details

Name:	us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

+ References

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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Weighted average interest rate of short-term debt outstanding calculated at point in time.

+ References

+ Details

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Data Type:	dtr-types:percentItemType
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Period Type:	instant

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ecl_EuropeanCommercialPaperMember
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ecl_TermLoanMember
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Balance Type:
Period Type:

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DEBT AND INTEREST (Details) - USD ($) $ in Millions	3 Months Ended
DEBT AND INTEREST (Details) - USD ($) $ in Millions	Dec. 31, 2021	Jun. 30, 2020	Dec. 31, 2020
Components of the company's debt obligations
Long-term debt, current maturities	$ 2.5		$ 1.8
Short-term debt including current maturities of long-term debt	411.0		17.3
Amount outstanding under the credit agreement	0.0		0.0
Letters of Credit, Surety Bonds and Guarantees, Outstanding, Amount	118.0
Maximum borrowing capacity for letters of credit, surety bonds and guarantees	338.0
Outstanding amount for letters of credit, surety bonds and guarantees	118.0
Commercial paper
Components of the company's debt obligations
Short term borrowings	$ 400.0
Average interest rate (as a percent)	0.28%
Maximum borrowing capacity, commercial paper	$ 2,000.0
U.S. commercial paper program
Components of the company's debt obligations
Maximum borrowing capacity, commercial paper	2,000.0
Outstanding commercial paper	400.0		0.0
European commercial paper
Components of the company's debt obligations
Maximum borrowing capacity, commercial paper	2,000.0
Outstanding commercial paper			0.0
Notes payable
Components of the company's debt obligations
Short term borrowings	$ 8.5		$ 15.5
Average interest rate (as a percent)	7.95%		7.07%
Remaining capacity	$ 1,628.0		$ 1,734.0
Multi Currency Revolving Credit Facility
Components of the company's debt obligations
Maximum borrowing capacity under the credit agreement	2,000.0
Term loan
Components of the company's debt obligations
Maximum borrowing capacity under the credit agreement	3,000.0
Amount repaid under the credit agreement	$ 3,000.0
Term credit agreement
Components of the company's debt obligations
Maximum borrowing capacity under the credit agreement		$ 305.0
Amount repaid under the credit agreement		$ 303.0