POST-EMPLOYMENT BENEFITS - Allocation of Plan Assets (Details)	Dec. 31, 2025	Dec. 31, 2024
Disclosure of fair value of plan assets [line items]
Domestic equity securities	7.70%	12.20%
International equity securities	30.80%	46.70%
Debt securities	59.70%	39.00%
Other - cash	1.80%	2.10%
Total	100.00%	100.00%
Minimum
Disclosure of fair value of plan assets [line items]
Target asset allocation percentage, debt securities	45.00%
Target asset allocation percentage, other - cash	0.00%
Minimum \| Domestic
Disclosure of fair value of plan assets [line items]
Target asset allocation percentage, equity securities	3.00%
Minimum \| International
Disclosure of fair value of plan assets [line items]
Target asset allocation percentage, equity securities	27.00%
Maximum
Disclosure of fair value of plan assets [line items]
Target asset allocation percentage, debt securities	75.00%
Target asset allocation percentage, other - cash	5.00%
Maximum \| Domestic
Disclosure of fair value of plan assets [line items]
Target asset allocation percentage, equity securities	13.00%
Maximum \| International
Disclosure of fair value of plan assets [line items]
Target asset allocation percentage, equity securities	37.00%

- 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.

+ References

No definition available.

+ Details

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

- Definition

Debt Instruments, Amount Contributed To Fair Value Of Plan Assets, Allocation Percentage

+ References

No definition available.

+ Details

Name:	rci_DebtInstrumentsAmountContributedToFairValueOfPlanAssetsAllocationPercentage
Namespace Prefix:	rci_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instruments, Amount Contributed To Fair Value Of Plan Assets, Target Allocation Percentage

+ References

No definition available.

+ Details

Name:	rci_DebtInstrumentsAmountContributedToFairValueOfPlanAssetsTargetAllocationPercentage
Namespace Prefix:	rci_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Domestic Equity Instruments, Amount Contributed To Fair Value Of Plan Assets, Allocation Percentage

+ References

No definition available.

+ Details

Name:	rci_DomesticEquityInstrumentsAmountContributedToFairValueOfPlanAssetsAllocationPercentage
Namespace Prefix:	rci_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Equity Instruments, Amount Contributed To Fair Value Of Plan Assets, Target Allocation Percentage

+ References

No definition available.

+ Details

Name:	rci_EquityInstrumentsAmountContributedToFairValueOfPlanAssetsTargetAllocationPercentage
Namespace Prefix:	rci_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

International Equity Instruments, Amount Contributed To Fair Value Of Plan Assets, Allocation Percentage

+ References

No definition available.

+ Details

Name:	rci_InternationalEquityInstrumentsAmountContributedToFairValueOfPlanAssetsAllocationPercentage
Namespace Prefix:	rci_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Other Assets, Amount Contributed To Fair Value Of Plan Assets, Allocation Percentage

+ References

No definition available.

+ Details

Name:	rci_OtherAssetsAmountContributedToFairValueOfPlanAssetsAllocationPercentage
Namespace Prefix:	rci_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Other Assets, Amount Contributed To Fair Value Of Plan Assets, Target Allocation Percentage

+ References

No definition available.

+ Details

Name:	rci_OtherAssetsAmountContributedToFairValueOfPlanAssetsTargetAllocationPercentage
Namespace Prefix:	rci_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Plan Assets At Fair Value, Allocation Percentage

+ References

No definition available.

+ Details

Name:	rci_PlanAssetsAtFairValueAllocationPercentage
Namespace Prefix:	rci_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

- Details

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

- Details

Name:	ifrs-full_GeographicalAreasAxis=ifrs-full_CountryOfDomicileMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_GeographicalAreasAxis=ifrs-full_ForeignCountriesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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