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COMMITMENTS AND CONTINGENT LIABILITIES - Narrative (Details) - Legal proceedings provision [member] - CAD ($)	Jul. 08, 2022	Oct. 29, 2021	Aug. 15, 2019
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
Customers With Power Outages
Disclosure of contingent liabilities [line items]
Refund amount	$ 150,000,000

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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- Definition

The amount of the estimated financial effect of contingent liabilities. [Refer: Contingent liabilities [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2022-03-24
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