v3.25.4
BUSINESS COMBINATIONS AND SALES - Schedule of Allocation for Property, Plant and Equipment Acquired from Acquisition (Details) - CAD ($)
$ in Millions
Dec. 31, 2025
Jul. 01, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment $ 26,307   $ 25,072 $ 24,332
Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment 23,208   22,377 21,771
Right-of-use assets        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment 3,099   2,695 2,561
Land and buildings | Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment 1,853   1,291 973
Computer equipment and software | Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment 2,282   1,926 2,341
Leasehold improvements | Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment 406   347 370
Equipment and vehicles | Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment 592   483 434
Construction in process | Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment 1,797   2,734 2,264
Gross carrying amount        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment 58,218   54,425 51,156
Gross carrying amount | Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment 53,421   50,378 47,412
Gross carrying amount | Right-of-use assets        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment 4,797   4,047 3,744
Gross carrying amount | Land and buildings | Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment 2,684   2,005 1,447
Gross carrying amount | Computer equipment and software | Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment 8,614   7,914 7,931
Gross carrying amount | Leasehold improvements | Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment 885   843 817
Gross carrying amount | Equipment and vehicles | Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment 1,669   1,527 1,451
Gross carrying amount | Construction in process | Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment 1,797   2,734 2,264
Accumulated depreciation and amortisation        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment (31,911)   (29,353) (26,824)
Accumulated depreciation and amortisation | Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment (30,213)   (28,001) (25,641)
Accumulated depreciation and amortisation | Right-of-use assets        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment (1,698)   (1,352) (1,183)
Accumulated depreciation and amortisation | Land and buildings | Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment (831)   (714) (474)
Accumulated depreciation and amortisation | Computer equipment and software | Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment (6,332)   (5,988) (5,590)
Accumulated depreciation and amortisation | Leasehold improvements | Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment (479)   (496) (447)
Accumulated depreciation and amortisation | Equipment and vehicles | Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment (1,077)   (1,044) (1,017)
Accumulated depreciation and amortisation | Construction in process | Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment 0   $ 0 $ 0
MLSE Transaction        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment 958      
MLSE Transaction | Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment 841      
MLSE Transaction | Right-of-use assets        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment 117      
MLSE Transaction | Land and buildings | Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment 634      
MLSE Transaction | Computer equipment and software | Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment 15      
MLSE Transaction | Leasehold improvements | Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment 89      
MLSE Transaction | Equipment and vehicles | Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment 63      
MLSE Transaction | Construction in process | Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment 40      
MLSE Transaction | Gross carrying amount        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment   $ 995    
MLSE Transaction | Gross carrying amount | Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment   874    
MLSE Transaction | Gross carrying amount | Right-of-use assets        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment   121    
MLSE Transaction | Gross carrying amount | Land and buildings | Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment   652    
MLSE Transaction | Gross carrying amount | Computer equipment and software | Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment   20    
MLSE Transaction | Gross carrying amount | Leasehold improvements | Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment   92    
MLSE Transaction | Gross carrying amount | Equipment and vehicles | Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment   70    
MLSE Transaction | Gross carrying amount | Construction in process | Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment   $ 40    
MLSE Transaction | Accumulated depreciation and amortisation        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment (37)      
MLSE Transaction | Accumulated depreciation and amortisation | Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment (33)      
MLSE Transaction | Accumulated depreciation and amortisation | Right-of-use assets        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment (4)      
MLSE Transaction | Accumulated depreciation and amortisation | Land and buildings | Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment (18)      
MLSE Transaction | Accumulated depreciation and amortisation | Computer equipment and software | Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment (5)      
MLSE Transaction | Accumulated depreciation and amortisation | Leasehold improvements | Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment (3)      
MLSE Transaction | Accumulated depreciation and amortisation | Equipment and vehicles | Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment (7)      
MLSE Transaction | Accumulated depreciation and amortisation | Construction in process | Property, plant and equipment        
Disclosure of detailed information about business combination [line items]        
Property, plant and equipment $ 0