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Commitments and contingencies (Details) - CAD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2022
Dec. 31, 2021
Disclosure of contingent liabilities [line items]      
Commitments for property, plant and equipment and intangible assets   $ 6,140  
Purchase obligations   3,294  
Leases committed not yet commenced   180  
Total   9,614  
Operating revenues   24,174 $ 23,449
Legal proceedings contingent liability      
Disclosure of contingent liabilities [line items]      
Operating revenues $ 44    
2023      
Disclosure of contingent liabilities [line items]      
Commitments for property, plant and equipment and intangible assets   2,015  
Purchase obligations   602  
Leases committed not yet commenced   14  
Total   2,631  
2024      
Disclosure of contingent liabilities [line items]      
Commitments for property, plant and equipment and intangible assets   1,392  
Purchase obligations   458  
Leases committed not yet commenced   21  
Total   1,871  
2025      
Disclosure of contingent liabilities [line items]      
Commitments for property, plant and equipment and intangible assets   1,052  
Purchase obligations   443  
Leases committed not yet commenced   16  
Total   1,511  
2026      
Disclosure of contingent liabilities [line items]      
Commitments for property, plant and equipment and intangible assets   516  
Purchase obligations   560  
Leases committed not yet commenced   16  
Total   1,092  
2027      
Disclosure of contingent liabilities [line items]      
Commitments for property, plant and equipment and intangible assets   216  
Purchase obligations   276  
Leases committed not yet commenced   17  
Total   509  
THERE- AFTER      
Disclosure of contingent liabilities [line items]      
Commitments for property, plant and equipment and intangible assets   949  
Purchase obligations   955  
Leases committed not yet commenced   96  
Total   $ 2,000