v3.25.4
Income taxes (Significant Components of Deferred Income Tax Assets and Liabilities) (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Deferred income tax assets (liabilities)    
Deferred income tax assets $ 611 $ 689
Deferred income tax liabilities (11,223) (10,874)
Net deferred income taxes (10,612) (10,185)
Deferred income tax assets    
Tax-deductible goodwill 611 689
Net operating losses and tax credit carryforwards 246 235
Lease liabilities 116 131
Pension liability 86 92
Unrealized foreign exchange losses 68 124
Personal Injury & legal claims 53 61
Compensation reserves 45 34
Other postretirement benefits liability 35 37
Other 80 59
Total deferred income tax assets 1,340 1,462
Deferred income tax liabilities    
Properties (10,319) (10,232)
Pension asset (1,404) (1,189)
Operating lease right-of-use assets (110) (121)
Other (119) (105)
Total deferred income tax liabilities (11,952) (11,647)
Net deferred income taxes (10,612) (10,185)
Net deferred income taxes by jurisdiction    
Canada (6,901) (6,405)
U.S.    
Net deferred income taxes by jurisdiction    
Foreign (4,322) (4,469)
Net interest expense deduction carryforward 958  
U.S. | State and Local Jurisdiction    
Net deferred income taxes by jurisdiction    
Net operating loss carryforwards 179  
Non-US    
Net deferred income taxes by jurisdiction    
Foreign 611 $ 689
Unamortized tax deductible goodwill $ 5,200