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COMMITMENTS AND CONTINGENT LIABILITIES - Narrative (Details) - Legal proceedings provision [member] - CAD ($) | Oct. 29, 2021 | Aug. 15, 2019
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CRTC |  |
Disclosure of contingent liabilities [line items] |  |
Markup (as a percent) |  | 10.00%
Refund amount |  | $ 25,000,000
Videotron |  |
Disclosure of contingent liabilities [line items] |  |
Estimated impact that would have resulted this quarter for CRTC's order as drafted | $ 850,000,000 |

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