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Leases - Disclosure of Right-Of-Use Assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of quantitative information about right-of-use assets [line items]      
Property, plant and equipment $ 27,513 $ 27,636 $ 27,101
Discontinued operations      
Disclosure of quantitative information about right-of-use assets [line items]      
Property, plant and equipment 484    
Gross carrying amount      
Disclosure of quantitative information about right-of-use assets [line items]      
Property, plant and equipment 79,198 77,363 74,340
Additions 4,732 4,769  
Acquired through business combinations 7 41  
Gross carrying amount | Discontinued operations      
Disclosure of quantitative information about right-of-use assets [line items]      
Discontinued operations (631) 11  
ACCUMULATED DEPRECIATION      
Disclosure of quantitative information about right-of-use assets [line items]      
Property, plant and equipment (51,685) (49,727) (47,239)
ACCUMULATED DEPRECIATION | Discontinued operations      
Disclosure of quantitative information about right-of-use assets [line items]      
Discontinued operations (147) 37  
Right-of-use assets      
Disclosure of quantitative information about right-of-use assets [line items]      
Property, plant and equipment 4,126 4,424 4,204
Right-of-use assets | Gross carrying amount      
Disclosure of quantitative information about right-of-use assets [line items]      
Property, plant and equipment 6,685 6,542 5,782
Additions 670 1,038  
Transfers (362) (233)  
Acquired through business combinations 4 8  
Lease terminations (30) (50)  
Impairment losses recognized in earnings (10) (5)  
Right-of-use assets | Gross carrying amount | Discontinued operations      
Disclosure of quantitative information about right-of-use assets [line items]      
Discontinued operations (129) (2)  
Right-of-use assets | ACCUMULATED DEPRECIATION      
Disclosure of quantitative information about right-of-use assets [line items]      
Property, plant and equipment (2,559) (2,118) (1,578)
Transfers (199) (111)  
Lease terminations (8) (25)  
Depreciation 671 670  
Right-of-use assets | ACCUMULATED DEPRECIATION | Discontinued operations      
Disclosure of quantitative information about right-of-use assets [line items]      
Discontinued operations (23) (6)  
Right-of-use assets | NETWORK INFRASTRUCTURE AND EQUIPMENT      
Disclosure of quantitative information about right-of-use assets [line items]      
Property, plant and equipment 2,217 2,308 2,287
Right-of-use assets | NETWORK INFRASTRUCTURE AND EQUIPMENT | Gross carrying amount      
Disclosure of quantitative information about right-of-use assets [line items]      
Property, plant and equipment 3,690 3,609 3,329
Additions 470 526  
Transfers (360) (233)  
Acquired through business combinations 0 0  
Lease terminations (20) (12)  
Impairment losses recognized in earnings (1) (2)  
Right-of-use assets | NETWORK INFRASTRUCTURE AND EQUIPMENT | Gross carrying amount | Discontinued operations      
Disclosure of quantitative information about right-of-use assets [line items]      
Discontinued operations (8) (1)  
Right-of-use assets | NETWORK INFRASTRUCTURE AND EQUIPMENT | ACCUMULATED DEPRECIATION      
Disclosure of quantitative information about right-of-use assets [line items]      
Property, plant and equipment (1,473) (1,301) (1,042)
Transfers (199) (111)  
Lease terminations (2) (3)  
Depreciation 377 372  
Right-of-use assets | NETWORK INFRASTRUCTURE AND EQUIPMENT | ACCUMULATED DEPRECIATION | Discontinued operations      
Disclosure of quantitative information about right-of-use assets [line items]      
Discontinued operations (4) (1)  
Right-of-use assets | LAND AND BUILDINGS      
Disclosure of quantitative information about right-of-use assets [line items]      
Property, plant and equipment 1,909 2,116 1,917
Right-of-use assets | LAND AND BUILDINGS | Gross carrying amount      
Disclosure of quantitative information about right-of-use assets [line items]      
Property, plant and equipment 2,995 2,933 2,453
Additions 200 512  
Transfers (2) 0  
Acquired through business combinations 4 8  
Lease terminations (10) (38)  
Impairment losses recognized in earnings (9) (3)  
Right-of-use assets | LAND AND BUILDINGS | Gross carrying amount | Discontinued operations      
Disclosure of quantitative information about right-of-use assets [line items]      
Discontinued operations (121) (1)  
Right-of-use assets | LAND AND BUILDINGS | ACCUMULATED DEPRECIATION      
Disclosure of quantitative information about right-of-use assets [line items]      
Property, plant and equipment (1,086) (817) $ (536)
Transfers 0 0  
Lease terminations (6) (22)  
Depreciation 294 298  
Right-of-use assets | LAND AND BUILDINGS | ACCUMULATED DEPRECIATION | Discontinued operations      
Disclosure of quantitative information about right-of-use assets [line items]      
Discontinued operations $ (19) $ (5)