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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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- Definition The characteristics of transfers in securitizations, asset-backed financing arrangements, or similar transfers recognized as sales, including a description of the transferor's continued involvement with the transferred financial assets (including servicing, recourse, and restriction on interest) that continue to be held by the transferor, the nature and fair value of the assets obtained as proceeds and the liabilities incurred in the transfer, and the gain (loss) from sale of the transferred financial assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719 + Details
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