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Commitments and contingencies (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2021
CAD ($)
Dec. 31, 2023
CAD ($)
carrier
petition
Dec. 31, 2022
CAD ($)
Disclosure of contingent liabilities [line items]      
Commitments for property, plant and equipment and intangible assets   $ 5,758  
Purchase obligations   3,022  
Leases committed not yet commenced   8  
Total   $ 9,198  
Number of major cable carriers | carrier   5  
Operating revenues   $ 24,673 $ 24,174
Loss contingency, number of petitions | petition   3  
OUTFRONT Media Inc.      
Disclosure of contingent liabilities [line items]      
Business combination, price of acquisition, expected   $ 410  
Legal proceedings contingent liability      
Disclosure of contingent liabilities [line items]      
Operating revenues $ 44    
2024      
Disclosure of contingent liabilities [line items]      
Commitments for property, plant and equipment and intangible assets   2,043  
Purchase obligations   619  
Leases committed not yet commenced   2  
Total   3,074  
2024 | OUTFRONT Media Inc.      
Disclosure of contingent liabilities [line items]      
Business combination, price of acquisition, expected   410  
2025      
Disclosure of contingent liabilities [line items]      
Commitments for property, plant and equipment and intangible assets   1,513  
Purchase obligations   513  
Leases committed not yet commenced   6  
Total   2,032  
2025 | OUTFRONT Media Inc.      
Disclosure of contingent liabilities [line items]      
Business combination, price of acquisition, expected   0  
2026      
Disclosure of contingent liabilities [line items]      
Commitments for property, plant and equipment and intangible assets   599  
Purchase obligations   537  
Leases committed not yet commenced   0  
Total   1,136  
2026 | OUTFRONT Media Inc.      
Disclosure of contingent liabilities [line items]      
Business combination, price of acquisition, expected   0  
2027      
Disclosure of contingent liabilities [line items]      
Commitments for property, plant and equipment and intangible assets   316  
Purchase obligations   314  
Leases committed not yet commenced   0  
Total   630  
2027 | OUTFRONT Media Inc.      
Disclosure of contingent liabilities [line items]      
Business combination, price of acquisition, expected   0  
2028      
Disclosure of contingent liabilities [line items]      
Commitments for property, plant and equipment and intangible assets   246  
Purchase obligations   219  
Leases committed not yet commenced   0  
Total   465  
2028 | OUTFRONT Media Inc.      
Disclosure of contingent liabilities [line items]      
Business combination, price of acquisition, expected   0  
THERE- AFTER      
Disclosure of contingent liabilities [line items]      
Commitments for property, plant and equipment and intangible assets   1,041  
Purchase obligations   820  
Leases committed not yet commenced   0  
Total   1,861  
THERE- AFTER | OUTFRONT Media Inc.      
Disclosure of contingent liabilities [line items]      
Business combination, price of acquisition, expected   $ 0