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income taxes - Temporary differences (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Reconciliation of temporary differences    
Balance at beginning of period $ 4,352 $ 4,436
Deferred income tax expense recognized in Net income (167) (140)
Deferred income tax expense recognized in other comprehensive income (45) (40)
Deferred income taxes charged directly to owners' equity and other 73 96
Balance at end of period 4,213 4,352
Property, plant, and equipment (owned) and intangible assets subject to amortization    
Reconciliation of temporary differences    
Balance at beginning of period 2,730 2,846
Deferred income tax expense recognized in Net income (88) (237)
Deferred income taxes charged directly to owners' equity and other 51 121
Balance at end of period 2,693 2,730
Intangible assets with indefinite lives    
Reconciliation of temporary differences    
Balance at beginning of period 1,945 1,856
Deferred income tax expense recognized in Net income 80 89
Balance at end of period 2,025 1,945
Property plant and equipment (leased), net of lease liabilities    
Reconciliation of temporary differences    
Balance at beginning of period 43 (32)
Deferred income tax expense recognized in Net income (38) 75
Balance at end of period 5 43
Contract assets and liabilities    
Reconciliation of temporary differences    
Balance at beginning of period 126 105
Deferred income tax expense recognized in Net income 42 21
Balance at end of period 168 126
Net pension amounts    
Reconciliation of temporary differences    
Balance at beginning of period (50) (34)
Deferred income tax expense recognized in Net income (13) (16)
Deferred income tax expense recognized in other comprehensive income 2  
Balance at end of period (61) (50)
Provisions not currently deductible    
Reconciliation of temporary differences    
Balance at beginning of period (204) (150)
Deferred income tax expense recognized in Net income (5) (52)
Deferred income taxes charged directly to owners' equity and other (3) (2)
Balance at end of period (212) (204)
Losses available to be carried forward    
Reconciliation of temporary differences    
Balance at beginning of period (202) (144)
Deferred income tax expense recognized in Net income (36) (37)
Deferred income taxes charged directly to owners' equity and other (7) (21)
Balance at end of period (245) (202)
Share-based compensation amounts and other    
Reconciliation of temporary differences    
Balance at beginning of period (36) (11)
Deferred income tax expense recognized in Net income (109) 17
Deferred income tax expense recognized in other comprehensive income (47) (40)
Deferred income taxes charged directly to owners' equity and other 32 (2)
Balance at end of period $ (160) $ (36)