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REVENUE - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Revenue from Contract with Customer [Abstract]
Accrued sales incentives	$ 113	$ 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