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RETIREMENT PLANS - Savings Plan and ESOP (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Contribution Plan Disclosure [Line Items] |  |  |
Percentage of matching contribution by company vested immediately | 100.00% |  |
Employer matching contribution expense | $ 72 | $ 76 | $ 72
Traditional Plan |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Cash balance benefits percentage | 5.00% |  |
Percentage of matching contribution made by company, up to 3% eligible compensation | 100.00% |  |
Percentage of matching contribution made by company for employee contributions between 3% and 5% | 50.00% |  |
Ecolab Plan |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Cash balance benefits percentage | 3.00% |  |
Percentage of matching contribution made by company, up to 4% eligible compensation | 100.00% |  |
Percentage of matching contribution made by company for employee contributions between 4% and 8% | 50.00% |  |
Minimum | Traditional Plan |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Percentage of eligible compensation, matched 50% | 3.00% |  |
Minimum | Ecolab Plan |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Percentage of eligible compensation, matched 50% | 4.00% |  |
Maximum | Traditional Plan |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Percentage of eligible compensation, matched 100% | 3.00% |  |
Percentage of eligible compensation, matched 50% | 5.00% |  |
Maximum | Ecolab Plan |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Percentage of eligible compensation, matched 100% | 4.00% |  |
Percentage of eligible compensation, matched 50% | 8.00% |  |

X
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- Definition Percentage of eligible compensation by employee before tax contribution, 100% matched by employer. + References No definition available. + Details
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- Definition Percentage of matching contribution by company vested immediately under a 401(k) savings plan. + References No definition available. + Details
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- Definition Percentage of employer matching contribution when employee before tax contribution is up to 3% of eligible compensation. + References No definition available. + Details
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- Definition Percentage of employer matching contribution when employee before tax contribution is between 3% to 5% of eligible compensation. + References No definition available. + Details
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- Definition Percentage of employer matching contribution when employee before tax contribution is between 4% to 8% of eligible compensation. + References No definition available. + Details
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- Definition Percentage of employer matching contribution when employee before tax contribution is up to 4% of eligible compensation. + References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- 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
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