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REVENUE (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Total net sales	100.00%	100.00%	100.00%
Percent of Total Company Revenue	100.00%	100.00%	100.00%
Other businesses
Disaggregation of Revenue [Line Items]
Percentage Of Company-Wide Revenue	2.00%	4.00%	5.00%
Contractors
Disaggregation of Revenue [Line Items]
Total net sales	10.00%	10.00%	10.00%
Commercial
Disaggregation of Revenue [Line Items]
Total net sales	10.00%	9.00%	11.00%
Government
Disaggregation of Revenue [Line Items]
Total net sales	15.00%	16.00%	14.00%
Healthcare
Disaggregation of Revenue [Line Items]
Total net sales	6.00%	7.00%	6.00%
Manufacturing
Disaggregation of Revenue [Line Items]
Total net sales	30.00%	30.00%	31.00%
Retail/Wholesale
Disaggregation of Revenue [Line Items]
Total net sales	10.00%	9.00%	8.00%
Transportation
Disaggregation of Revenue [Line Items]
Total net sales	5.00%	5.00%	5.00%
Other
Disaggregation of Revenue [Line Items]
Total net sales	14.00%	14.00%	15.00%
High-Touch Solutions N.A.
Disaggregation of Revenue [Line Items]
Total net sales	100.00%	100.00%	100.00%
Percent of Total Company Revenue	78.00%	78.00%	79.00%
High-Touch Solutions N.A. | Contractors
Disaggregation of Revenue [Line Items]
Total net sales	9.00%	9.00%	10.00%
High-Touch Solutions N.A. | Commercial
Disaggregation of Revenue [Line Items]
Total net sales	9.00%	8.00%	10.00%
High-Touch Solutions N.A. | Government
Disaggregation of Revenue [Line Items]
Total net sales	18.00%	20.00%	17.00%
High-Touch Solutions N.A. | Healthcare
Disaggregation of Revenue [Line Items]
Total net sales	7.00%	9.00%	7.00%
High-Touch Solutions N.A. | Manufacturing
Disaggregation of Revenue [Line Items]
Total net sales	30.00%	29.00%	31.00%
High-Touch Solutions N.A. | Retail/Wholesale
Disaggregation of Revenue [Line Items]
Total net sales	10.00%	9.00%	8.00%
High-Touch Solutions N.A. | Transportation
Disaggregation of Revenue [Line Items]
Total net sales	5.00%	5.00%	6.00%
High-Touch Solutions N.A. | Other
Disaggregation of Revenue [Line Items]
Total net sales	12.00%	11.00%	11.00%
Endless Assortment
Disaggregation of Revenue [Line Items]
Total net sales	100.00%	100.00%	100.00%
Percent of Total Company Revenue	20.00%	18.00%	16.00%
Endless Assortment | Contractors
Disaggregation of Revenue [Line Items]
Total net sales	16.00%	15.00%	16.00%
Endless Assortment | Commercial
Disaggregation of Revenue [Line Items]
Total net sales	15.00%	15.00%	15.00%
Endless Assortment | Government
Disaggregation of Revenue [Line Items]
Total net sales	3.00%	3.00%	3.00%
Endless Assortment | Healthcare
Disaggregation of Revenue [Line Items]
Total net sales	2.00%	2.00%	1.00%
Endless Assortment | Manufacturing
Disaggregation of Revenue [Line Items]
Total net sales	29.00%	29.00%	31.00%
Endless Assortment | Retail/Wholesale
Disaggregation of Revenue [Line Items]
Total net sales	10.00%	10.00%	10.00%
Endless Assortment | Transportation
Disaggregation of Revenue [Line Items]
Total net sales	3.00%	3.00%	3.00%
Endless Assortment | Other
Disaggregation of Revenue [Line Items]
Total net sales	22.00%	23.00%	21.00%

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