SUPPLEMENTAL CASH FLOW INFORMATION - Additions to property, plant and equipment, net (Details) - CAD CAD in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Cash Flow Statement [Abstract]
Capital expenditures before proceeds on disposition 2	CAD 2,510	CAD 2,352
Proceeds on disposition	(74)	0
Capital expenditures	CAD 2,436	CAD 2,352

The cash inflow from sales of property, plant and equipment, classified as investing activities. [Refer: Property, plant and equipment]

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 7
-IssueDate 2017-01-01
-Paragraph 16
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_16_b&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow for the purchases of property, plant and equipment, classified as investing activities. [Refer: Property, plant and equipment]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 7
-IssueDate 2017-01-01
-Paragraph 16
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_16_a&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Cash Flow Statement [Abstract]

+ References

No definition available.

+ Details

Name:	rci_CashFlowStatementAbstract
Namespace Prefix:	rci_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Proceeds From Sales (Purchase Of) Property, Plant and Equipment, Classified As Investing Activities

+ References

No definition available.

+ Details

Name:	rci_ProceedsFromSalesPurchaseOfPropertyPlantandEquipmentClassifiedAsInvestingActivities
Namespace Prefix:	rci_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration