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NATURE OF THE BUSINESS (Details) | 12 Months Ended
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Dec. 31, 2017 segment
Corporate Information And Statement Of IFRS Compliance [Abstract] |
Number of reportable segments | 4

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- Definition Corporate Information and Statement of IFRS Compliance [Abstract] + References No definition available. + Details
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Namespace Prefix: | rci_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | rci_NumberOfReportableSegments1
Namespace Prefix: | rci_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration