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REVENUE - Disaggregation of Revenue (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	$ 13,916	$ 15,073
Operating segments | Wireless
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	8,530	9,250
Operating segments | Wireless | Service revenue
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	6,579	7,156
Operating segments | Wireless | Equipment revenue
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	1,951	2,094
Operating segments | Cable
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	3,946	3,954
Operating segments | Cable | Service revenue
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	3,936	3,940
Operating segments | Cable | Equipment revenue
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	10	14
Operating segments | Media
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	1,606	2,072
Corporate items and intercompany eliminations
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	$ (166)	$ (203)

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- Definition

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

+ References

No definition available.

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- Definition

The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration.

+ References

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