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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%

X

- 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

X

- 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

X

- 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

X

- Details

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