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REVENUE - Narrative (Details)	12 Months Ended
	Dec. 31, 2020
Service revenue | Minimum
Disclosure of disaggregation of revenue from contracts with customers [line items]
Expected period of recognition	3 years
Service revenue | Maximum
Disclosure of disaggregation of revenue from contracts with customers [line items]
Expected period of recognition	5 years
Wireless | Service revenue
Disclosure of disaggregation of revenue from contracts with customers [line items]
Typical payment period	30 days
Wireless | Equipment revenue | Maximum
Disclosure of disaggregation of revenue from contracts with customers [line items]
Typical payment period	24 months
Cable | Service revenue
Disclosure of disaggregation of revenue from contracts with customers [line items]
Typical payment period	30 days
Cable | Equipment revenue | Maximum
Disclosure of disaggregation of revenue from contracts with customers [line items]
Typical payment period	24 months
Media | Maximum
Disclosure of disaggregation of revenue from contracts with customers [line items]
Typical payment period	30 days

X

- 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.

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Revenue, Remaining Performance Obligation, Expected Period Of Recognition

+ References

No definition available.

+ Details

Name:	rci_RevenueRemainingPerformanceObligationExpectedPeriodOfRecognition
Namespace Prefix:	rci_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Revenue from Contracts With Customers, Typical Payment Period

+ References

No definition available.

+ Details

Name:	rci_RevenuefromContractsWithCustomersTypicalPaymentPeriod
Namespace Prefix:	rci_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_ProductsAndServicesAxis=rci_ServiceRevenueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SegmentsAxis=rci_WirelessSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ProductsAndServicesAxis=rci_EquipmentSalesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SegmentsAxis=rci_CableSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SegmentsAxis=rci_MediaSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: