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GOODWILL AND OTHER INTANGIBLE ASSETS (Details) - USD ($) $ in Billions	Mar. 31, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and intangible assets	$ 1.1	$ 1.1
Goodwill and intangible assets, percent of total assets	19.00%	19.00%

X

- Definition

Intangible Assets Net Including Goodwill Percent Of Total Assets

+ References

No definition available.

+ Details

Name:	gww_IntangibleAssetsNetIncludingGoodwillPercentOfTotalAssets
Namespace Prefix:	gww_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Carrying amount of finite-lived intangible assets, indefinite-lived intangible assets and goodwill. Goodwill is an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Intangible assets are assets, not including financial assets, lacking physical substance.

+ References

No definition available.

+ Details

Name:	us-gaap_IntangibleAssetsNetIncludingGoodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant