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DEBT (Details) - USD ($)	12 Months Ended							24 Months Ended
DEBT (Details) - USD ($)	Jun. 14, 2026	Jun. 14, 2025	Jun. 14, 2024	Jun. 14, 2023	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jun. 14, 2028	Dec. 14, 2020
Debt Instrument [Line Items]
Characteristics of Securitizations or Asset-backed Financing Arrangements that are Accounted for as Sale					Under the Receivables Facility, Wesco 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 balance sheet, and Wesco recognizes the related secured borrowing. Wesco has agreed to continue servicing the sold 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					$ 1,270,000,000	$ 950,000,000
Percentage of principal amount of Senior Notes accelerated under default					0.25
Debt Issuance Costs, Net					(62,484,000)	$ (78,850,000)
Long-term Debt, Gross					$ 4,780,685,000
Foreign Line of Credit [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate					3.35%	3.40%
Long-term debt					$ 7,354,000	$ 29,575,000
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					$ 1,728,100,000	1,476,100,000
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate					1.23%
Line of Credit Facility, Opportunity to Increase Borrowing Capacity						1,400,000,000
Debt Instrument, Unused Borrowing Capacity, Amount					$ 1,200,000,000	1,025,000,000	$ 600,000,000
Long-term debt					$ 1,270,000,000	950,000,000
Debt Instrument, Interest Rate, Stated Percentage					0.50%
Commitment Fee							0.45%
Senior Notes due 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date					Jun. 15, 2024
Long-term debt					$ 0	350,000,000
Debt Instrument, Interest Rate, Stated Percentage					5.375%
Debt Instrument, Face Amount					$ 350,000,000
Debt Instrument, Redemption Price, Percentage					101.344%
Gain (Loss) on Extinguishment of Debt					$ 6,900,000
Gain (Loss) on Extinguishment of Debt, before Write off of Debt Issuance Cost					4,700,000
Write off of Deferred Debt Issuance Cost					2,200,000
5.50% Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Long-term debt					$ 58,600,000
Debt Instrument, Interest Rate, Stated Percentage					5.50%
Debt Instrument, Face Amount					$ 350,000,000
Senior Notes tender offer consideration per $1,000 principal amount					50.00
6.00% Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Long-term debt					$ 4,200,000
Debt Instrument, Interest Rate, Stated Percentage					6.00%
Debt Instrument, Face Amount					$ 250,000,000
Senior Notes consent fee per $1,000 principal amount					2.50
Senior Notes tender offer consideration per $1,000 principal amount					$ 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
Debt Instrument, Interest Rate, Stated Percentage					7.125%
Debt Instrument, Face Amount					$ 1,500,000,000
Discount percentage of par value					100.00%
Deferred Finance Costs, Gross					$ 33,100,000
Debt Instrument, Redemption Price, Percentage					35.00%
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					$ 1,316,912,000	1,315,668,000
Debt Instrument, Interest Rate, Stated Percentage					7.25%
Debt Instrument, Face Amount					$ 1,325,000,000
Discount percentage of par value					99.244%
Deferred Finance Costs, Gross					$ 29,300,000
Debt Instrument, Redemption Price, Percentage					35.00%
Long-term Debt, Gross					$ 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%
Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date					Dec. 15, 2021
Long-term debt					$ 0	500,000,000
Debt Instrument, Interest Rate, Stated Percentage					5.375%
Debt Instrument, Face Amount					$ 500,000,000
Debt Instrument, Redemption Price, Percentage					100.00%
Write off of Deferred Debt Issuance Cost					$ 1,000,000
Revolving credit facility
Debt Instrument [Line Items]
Line of Credit Facility, Opportunity to Increase Borrowing Capacity					500,000,000
Debt Instrument, Unused Borrowing Capacity, Amount					$ 1,100,000,000				$ 1,200,000,000
Debt Instrument, Interest Rate During Period					1.54%
Debt Instrument, Increase, Additional Borrowings					$ 2,353,400,000	1,197,900,000
Debt Instrument, Decrease, Repayments					2,006,400,000	948,000,000
Long-term debt					596,959,000	250,000,000
Line of Credit Facility, Remaining Borrowing Capacity					564,800,000	801,500,000
Revolving credit facility \| Letter of Credit [Member]
Debt Instrument [Line Items]
Debt Instrument, Unused Borrowing Capacity, Amount					$ 175,000,000
Accounts Receivable Securitization Facility Amended
Debt Instrument [Line Items]
Debt Instrument, Maturity Date					Jun. 21, 2024
Debt Instrument, Basis Spread on Variable Rate					1.15%
Line of Credit Facility, Opportunity to Increase Borrowing Capacity						$ 1,500,000,000
Debt Instrument, Unused Borrowing Capacity, Amount					$ 1,300,000,000
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
Maximum \| Foreign Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity					$ 31,000,000
London Interbank Offered Rate (LIBOR) [Member] \| Minimum \| Revolving credit facility
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate					1.25%
London Interbank Offered Rate (LIBOR) [Member] \| Maximum \| Revolving credit facility
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate					1.50%
Prime Rate [Member] \| Minimum \| Revolving credit facility
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate					0.25%
Prime Rate [Member] \| Maximum \| Revolving credit facility
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate					0.50%