GOODWILL AND OTHER INTANGIBLE ASSETS	3 Months Ended
Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND OTHER INTANGIBLE ASSETS	GOODWILL AND OTHER INTANGIBLE ASSETS Grainger had approximately $1.1 billion of goodwill and intangible assets as of March 31, 2017 and December 31, 2016, respectively, or 19% and 20% of total assets. Goodwill and intangible assets with indefinite lives are tested for impairment at least annually or when events or changes in circumstances indicate the carrying value of these assets might exceed their current fair values. To detect these events, Grainger periodically performs qualitative assessments of factors such as a reporting units' historical and current performance, overall economic factors and assumptions regarding future performance, to determine if it is more likely than not that the goodwill and intangible assets might be impaired and whether it is necessary to perform the two-step quantitative goodwill impairment test. As previously reported, Grainger completed the annual goodwill and intangible assets impairment testing during the fourth quarter of 2016. The estimated fair values substantially exceeded the carrying values for all of the Company’s reporting units, except for Fabory, which resulted in a $47 million goodwill impairment charge per the two-step quantitative goodwill impairment test. Grainger monitors the operating performance of its reporting units and the quarterly assessment did not indicate the presence of goodwill impairment triggering events as of March 31, 2017. Changes in assumptions regarding future performance, unfavorable economic environment and changes in market conditions or other factors may have a significant impact on reporting units' cash flows in the future and Grainger may be required to recognize an impairment for goodwill.

GOODWILL AND OTHER INTANGIBLE ASSETS

Grainger had approximately $1.1 billion of goodwill and intangible assets as of March 31, 2017 and December 31, 2016, respectively, or 19% and 20% of total assets. Goodwill and intangible assets with indefinite lives are tested for impairment at least annually or when events or changes in circumstances indicate the carrying value of these assets might exceed their current fair values. To detect these events, Grainger periodically performs qualitative assessments of factors such as a reporting units' historical and current performance, overall economic factors and assumptions regarding future performance, to determine if it is more likely than not that the goodwill and intangible assets might be impaired and whether it is necessary to perform the two-step quantitative goodwill impairment test.

As previously reported, Grainger completed the annual goodwill and intangible assets impairment testing during the fourth quarter of 2016. The estimated fair values substantially exceeded the carrying values for all of the Company’s reporting units, except for Fabory, which resulted in a $47 million goodwill impairment charge per the two-step quantitative goodwill impairment test.

Grainger monitors the operating performance of its reporting units and the quarterly assessment did not indicate the presence of goodwill impairment triggering events as of March 31, 2017. Changes in assumptions regarding future performance, unfavorable economic environment and changes in market conditions or other factors may have a significant impact on reporting units' cash flows in the future and Grainger may be required to recognize an impairment for goodwill.