v3.25.4
Financial and capital management - Maturity Analysis for Recognized Financial Liabilities (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2025
CAD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
CAD ($)
Dec. 31, 2024
USD ($)
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Duration of maturity of financial liabilities 5 years      
Loan secured by receivables        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Current borrowings $ 1,594 $ 1,163 $ 1,600 $ 1,112
Trade receivables        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Total debt, excluding lease liabilities 37,070   36,862  
Trade receivables | Lease liabilities        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Total debt, excluding lease liabilities 4,309   4,591  
Trade receivables | Notes payable        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Current borrowings 2,566   2,203  
Trade receivables | Loan secured by receivables        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Current borrowings 1,594   $ 1,600  
Liquidity risk        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Interest payable on long-term debt, notes payable and loan secured by receivables 24,571      
Net payments (receipts) on cross currency interest rate swaps and interest rate swaps (449)      
Total 66,292      
Liquidity risk | 2026        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Interest payable on long-term debt, notes payable and loan secured by receivables 1,675      
Net payments (receipts) on cross currency interest rate swaps and interest rate swaps 15      
Total 8,005      
Liquidity risk | 2027        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Interest payable on long-term debt, notes payable and loan secured by receivables 1,533      
Net payments (receipts) on cross currency interest rate swaps and interest rate swaps (7)      
Total 4,261      
Liquidity risk | 2028        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Interest payable on long-term debt, notes payable and loan secured by receivables 1,470      
Net payments (receipts) on cross currency interest rate swaps and interest rate swaps (13)      
Total 4,344      
Liquidity risk | 2029        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Interest payable on long-term debt, notes payable and loan secured by receivables 1,363      
Net payments (receipts) on cross currency interest rate swaps and interest rate swaps (27)      
Total 3,760      
Liquidity risk | 2030        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Interest payable on long-term debt, notes payable and loan secured by receivables 1,272      
Net payments (receipts) on cross currency interest rate swaps and interest rate swaps 74      
Total 3,811      
Liquidity risk | Thereafter        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Interest payable on long-term debt, notes payable and loan secured by receivables 17,258      
Net payments (receipts) on cross currency interest rate swaps and interest rate swaps (491)      
Total 42,111      
Liquidity risk | Trade receivables | Total debt, excluding lease liabilities        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Total debt, excluding lease liabilities 32,761      
Liquidity risk | Trade receivables | Total debt, excluding lease liabilities | 2026        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Total debt, excluding lease liabilities 1,064      
Liquidity risk | Trade receivables | Total debt, excluding lease liabilities | 2027        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Total debt, excluding lease liabilities 2,042      
Liquidity risk | Trade receivables | Total debt, excluding lease liabilities | 2028        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Total debt, excluding lease liabilities 2,404      
Liquidity risk | Trade receivables | Total debt, excluding lease liabilities | 2029        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Total debt, excluding lease liabilities 2,028      
Liquidity risk | Trade receivables | Total debt, excluding lease liabilities | 2030        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Total debt, excluding lease liabilities 2,075      
Liquidity risk | Trade receivables | Total debt, excluding lease liabilities | Thereafter        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Total debt, excluding lease liabilities 23,148      
Liquidity risk | Trade receivables | Lease liabilities        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Current borrowings 5,249      
Interest expense on debt instruments issued 940      
Liquidity risk | Trade receivables | Lease liabilities | 2026        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Current borrowings 1,091      
Liquidity risk | Trade receivables | Lease liabilities | 2027        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Current borrowings 693      
Liquidity risk | Trade receivables | Lease liabilities | 2028        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Current borrowings 483      
Liquidity risk | Trade receivables | Lease liabilities | 2029        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Current borrowings 396      
Liquidity risk | Trade receivables | Lease liabilities | 2030        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Current borrowings 390      
Liquidity risk | Trade receivables | Lease liabilities | Thereafter        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Current borrowings 2,196      
Liquidity risk | Trade receivables | Notes payable        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Current borrowings 2,566      
Liquidity risk | Trade receivables | Notes payable | 2026        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Current borrowings 2,566      
Liquidity risk | Trade receivables | Notes payable | 2027        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Current borrowings 0      
Liquidity risk | Trade receivables | Notes payable | 2028        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Current borrowings 0      
Liquidity risk | Trade receivables | Notes payable | 2029        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Current borrowings 0      
Liquidity risk | Trade receivables | Notes payable | 2030        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Current borrowings 0      
Liquidity risk | Trade receivables | Notes payable | Thereafter        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Current borrowings 0      
Liquidity risk | Trade receivables | Loan secured by receivables        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Current borrowings 1,594      
Liquidity risk | Trade receivables | Loan secured by receivables | 2026        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Current borrowings 1,594      
Liquidity risk | Trade receivables | Loan secured by receivables | 2027        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Current borrowings 0      
Liquidity risk | Trade receivables | Loan secured by receivables | 2028        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Current borrowings 0      
Liquidity risk | Trade receivables | Loan secured by receivables | 2029        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Current borrowings 0      
Liquidity risk | Trade receivables | Loan secured by receivables | 2030        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Current borrowings 0      
Liquidity risk | Trade receivables | Loan secured by receivables | Thereafter        
Disclosure of maturity analysis for non-derivative financial liabilities [line items]        
Current borrowings $ 0