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REVENUE - Narrative (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Revenue from Contract with Customer [Abstract] |  |
Accrued sales incentives | $ 114 | $ 109

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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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- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration