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DEBT (Details) - USD ($)	5 Months Ended		9 Months Ended	10 Months Ended	11 Months Ended	12 Months Ended								20 Months Ended	24 Months Ended
	Dec. 31, 2022	Aug. 01, 2022	Feb. 28, 2022	Dec. 31, 2022	May 31, 2021	Jun. 14, 2026	Jun. 14, 2025	Jun. 14, 2024	Jun. 14, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Feb. 28, 2022	Jun. 14, 2028	Aug. 02, 2022	Mar. 01, 2022	Jun. 01, 2021	Dec. 14, 2020	Jun. 22, 2020
Debt Instrument [Line Items]
Characteristics of Securitizations or Asset-backed Financing Arrangements that are Accounted for as Sale										Under the Receivables Facility, Wesco Distribution sells, on a continuous basis, an undivided interest in all domestic accounts receivable to Wesco Receivables, a wholly-owned special purpose entity (the “SPE”). The SPE sells, without recourse, a senior undivided interest in the receivables to financial institutions for cash while maintaining a subordinated undivided interest in the receivables, in the form of overcollateralization. Since Wesco maintains control of the transferred receivables, the transfers do not qualify for “sale” treatment. As a result, the transferred receivables remain on the Company's balance sheet, and Wesco recognizes the related secured borrowing. Wesco has agreed to continue servicing the receivables for the third-party conduits and financial institutions at market rates; accordingly, no servicing asset or liability has been recorded.
Accounts Receivable from Securitization	$ 1,535,000,000			$ 1,535,000,000						$ 1,535,000,000	$ 1,270,000,000
Percentage of principal amount of Senior Notes accelerated under default	0.25			0.25						0.25
Debt Issuance Costs, Net	(51,099,000)			(51,099,000)						(51,099,000)	$ (62,484,000)
Long-term Debt, Gross	$ 5,474,123,000			$ 5,474,123,000						$ 5,474,123,000
Foreign Line of Credit [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	4.84%			4.84%						4.84%	3.35%
Long-term debt	$ 7,088,000			$ 7,088,000						$ 7,088,000	$ 7,354,000
Accounts Receivable Securitization Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date											Jun. 22, 2023
Debt Instrument, Basis Spread on Variable Rate					1.20%								0.95%
Accounts Receivable Eligible for Securitization	$ 2,028,200,000			$ 2,028,200,000						$ 2,028,200,000	$ 1,728,100,000
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	5.20%			5.20%						5.20%
Line of Credit Facility, Opportunity to Increase Borrowing Capacity					$ 1,400,000,000
Debt Instrument, Unused Borrowing Capacity, Amount													$ 600,000,000							$ 1,025,000,000
Long-term debt	$ 1,535,000,000			$ 1,535,000,000						$ 1,535,000,000	$ 1,270,000,000
Debt Instrument, Interest Rate, Stated Percentage											0.50%
Commitment Fee										0.45%
5.50% Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date										Mar. 01, 2023
Long-term debt	$ 58,636,000			$ 58,636,000						$ 58,636,000
Debt Instrument, Interest Rate, Stated Percentage	5.50%			5.50%						5.50%
Debt Instrument, Face Amount	$ 350,000,000			$ 350,000,000						$ 350,000,000
Senior Notes tender offer consideration per $1,000 principal amount	50.00			50.00						$ 50.00
6.00% Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date										Dec. 01, 2025
Long-term debt	$ 4,173,000			$ 4,173,000						$ 4,173,000
Debt Instrument, Interest Rate, Stated Percentage	6.00%			6.00%						6.00%
Debt Instrument, Face Amount	$ 250,000,000			$ 250,000,000						$ 250,000,000
Senior Notes consent fee per $1,000 principal amount	2.50			2.50						2.50
Senior Notes tender offer consideration per $1,000 principal amount	1,012.5			1,012.5						$ 1,012.5
A7125 Senior Notes Due 2025
Debt Instrument [Line Items]
Debt Instrument, Maturity Date										Jun. 15, 2025
Debt Instrument, Issuance Date										Jun. 12, 2020
Long-term debt	$ 1,500,000,000			$ 1,500,000,000						$ 1,500,000,000	$ 1,500,000,000
Debt Instrument, Interest Rate, Stated Percentage	7.125%			7.125%						7.125%
Debt Instrument, Face Amount	$ 1,500,000,000			$ 1,500,000,000						$ 1,500,000,000
Discount percentage of par value	100.00%			100.00%						100.00%
Deferred Finance Costs, Gross	$ 33,100,000			$ 33,100,000						$ 33,100,000
A7125 Senior Notes Due 2025 | Forecast [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed							100.00%	101.781%	103.563%
A7250 Senior Notes Due 2028
Debt Instrument [Line Items]
Debt Instrument, Maturity Date										Jun. 15, 2028
Debt Instrument, Issuance Date										Jun. 12, 2020
Long-term debt	$ 1,318,156,000			$ 1,318,156,000						$ 1,318,156,000	1,316,912,000
Debt Instrument, Interest Rate, Stated Percentage	7.25%			7.25%						7.25%
Debt Instrument, Face Amount	$ 1,325,000,000			$ 1,325,000,000						$ 1,325,000,000
Discount percentage of par value	99.244%			99.244%						99.244%
Deferred Finance Costs, Gross	$ 29,300,000			$ 29,300,000						$ 29,300,000
Debt Instrument, Redemption Price, Percentage										35.00%
Long-term Debt, Gross	1,325,000,000			$ 1,325,000,000						$ 1,325,000,000
A7250 Senior Notes Due 2028 | Forecast [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed						101.208%	102.417%	103.625%							100.00%
Revolving credit facility
Debt Instrument [Line Items]
Debt Instrument, Maturity Date				Mar. 01, 2027										Jun. 22, 2025
Line of Credit Facility, Opportunity to Increase Borrowing Capacity				$ 650,000,000							400,000,000	$ 500,000,000
Debt Instrument, Unused Borrowing Capacity, Amount	1,725,000,000			1,725,000,000						$ 1,725,000,000						$ 1,525,000,000	$ 1,350,000,000		$ 1,200,000,000	$ 1,100,000,000
Debt Instrument, Interest Rate During Period										5.37%
Debt Instrument, Increase, Additional Borrowings										$ 3,990,000,000	2,353,400,000
Debt Instrument, Decrease, Repayments										3,557,100,000	2,006,400,000
Long-term debt	1,023,609,000			1,023,609,000						1,023,609,000	596,959,000
Line of Credit Facility, Remaining Borrowing Capacity	664,900,000			664,900,000						664,900,000	564,800,000
Canadian Dollar Sub-Facility Commitment	625,000,000			625,000,000						625,000,000	500,000,000					600,000,000	550,000,000
Limit on dividends	80,000,000			80,000,000						80,000,000	$ 50,000,000
Revolving credit facility | Letter of Credit [Member]
Debt Instrument [Line Items]
Debt Instrument, Unused Borrowing Capacity, Amount	$ 175,000,000			175,000,000						$ 175,000,000
Accounts Receivable Securitization Facility Amended
Debt Instrument [Line Items]
Debt Instrument, Maturity Date										Mar. 01, 2025	Jun. 21, 2024
Debt Instrument, Basis Spread on Variable Rate	1.05%	1.10%	1.15%
Line of Credit Facility, Opportunity to Increase Borrowing Capacity			$ 1,500,000,000	1,750,000,000
Debt Instrument, Unused Borrowing Capacity, Amount	$ 1,625,000,000			1,625,000,000						$ 1,625,000,000						$ 1,525,000,000	$ 1,400,000,000	$ 1,300,000,000	$ 1,200,000,000
Debt Instrument, Interest Rate, Stated Percentage											0.00%
Minimum | Foreign Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity	600,000			600,000						600,000
Maximum | Foreign Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity	$ 31,000,000			$ 31,000,000						$ 31,000,000
Prime Rate [Member] | Minimum | Revolving credit facility
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate										0.00%
Prime Rate [Member] | Maximum | Revolving credit facility
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate										0.50%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum | Revolving credit facility
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate										1.00%
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maximum | Revolving credit facility
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate										1.50%

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