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v3.22.1

REVENUE - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Disaggregation of Revenue [Line Items] |  |  |
Contract With Customer, Sales Incentive Liability | $ 72 |  | $ 73
Service Revenue [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percent of Total Company Revenue | 1.00% | 1.00% |

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- Definition Contract With Customer, Sales Incentive Liability + References No definition available. + Details
Name: | gww_ContractWithCustomerSalesIncentiveLiability
Namespace Prefix: | gww_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Percentage Of Company-Wide Revenue + References No definition available. + Details
Name: | gww_PercentageOfCompanyWideRevenue
Namespace Prefix: | gww_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | srt_ProductOrServiceAxis=gww_ServiceRevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |