v3.25.4
FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Liquidity Risk (Details) - CAD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Short-term borrowings $ 4,000 $ 2,959  
Accounts payable and accrued liabilities 4,831 4,059  
MLSE put liability 3,316 0  
Long-term debt 37,058 41,896 $ 40,855
Lease liabilities 3,118 2,778 2,593
Net carrying amount of derivatives (asset) (97) (425) 538
Expenditure derivative instruments:      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Net carrying amount of derivatives (asset) 17 0  
Expenditure derivative instruments: | Cash flow hedges      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Net carrying amount of derivatives (asset) 8 (132) 15
Equity derivative instruments      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Net carrying amount of derivatives (asset) (28) 54 (48)
Subsidiary equity derivative instruments      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Net carrying amount of derivatives (asset) 35 0  
Debt derivative instruments      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Net carrying amount of derivatives (asset) 0 (5) 101
Debt derivative instruments | Cash flow hedges      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Net carrying amount of derivatives (asset) (135) (352) $ 470
Liquidity risk      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Short-term borrowings 4,000 2,959  
Short-term borrowings, undiscounted cash flows 4,000 2,959  
Accounts payable and accrued liabilities 4,831 4,059  
Accounts payable and accrued liabilities, undiscounted cash flows 4,831 4,059  
MLSE put liability 3,316    
MLSE put liability, undiscounted cash flows 3,316    
Income tax payable   26  
Income tax payable, undiscounted cash flows   26  
Long-term debt 37,058 41,896  
Long-term debt, undiscounted cash flows 37,932 42,886  
Lease liabilities 3,118 2,778  
Lease liabilities, undiscounted cash flows 4,074 3,546  
Other long-term financial liabilities 443 49  
Other long-term financial liabilities, undiscounted cash flows 443 49  
Net carrying amount of derivatives (asset) (97) (425)  
Financial liabilities 52,669 51,342  
Financial liabilities, undiscounted cash flows 52,797 50,387  
Liquidity risk | Less than 1 year      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Short-term borrowings, undiscounted cash flows 4,000 2,959  
Accounts payable and accrued liabilities, undiscounted cash flows 4,831 4,059  
MLSE put liability, undiscounted cash flows 3,316    
Income tax payable, undiscounted cash flows   26  
Long-term debt, undiscounted cash flows 3,186 3,696  
Lease liabilities, undiscounted cash flows 692 587  
Other long-term financial liabilities, undiscounted cash flows 0 1  
Financial liabilities, undiscounted cash flows 15,906 10,961  
Net interest payments 1,861 1,925  
Liquidity risk | 1-3 Years      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Short-term borrowings, undiscounted cash flows 0 0  
Accounts payable and accrued liabilities, undiscounted cash flows 0 0  
MLSE put liability, undiscounted cash flows 0    
Income tax payable, undiscounted cash flows   0  
Long-term debt, undiscounted cash flows 6,529 8,970  
Lease liabilities, undiscounted cash flows 895 1,084  
Other long-term financial liabilities, undiscounted cash flows 132 2  
Financial liabilities, undiscounted cash flows 7,233 9,622  
Net interest payments 3,174 3,303  
Liquidity risk | 4-5 years      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Short-term borrowings, undiscounted cash flows 0 0  
Accounts payable and accrued liabilities, undiscounted cash flows 0 0  
MLSE put liability, undiscounted cash flows 0    
Income tax payable, undiscounted cash flows   0  
Long-term debt, undiscounted cash flows 6,795 5,799  
Lease liabilities, undiscounted cash flows 543 406  
Other long-term financial liabilities, undiscounted cash flows 70 42  
Financial liabilities, undiscounted cash flows 7,336 6,132  
Net interest payments 2,674 2,528  
Liquidity risk | After 5 years      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Short-term borrowings, undiscounted cash flows 0 0  
Accounts payable and accrued liabilities, undiscounted cash flows 0 0  
MLSE put liability, undiscounted cash flows 0    
Income tax payable, undiscounted cash flows   0  
Long-term debt, undiscounted cash flows 21,422 24,421  
Lease liabilities, undiscounted cash flows 1,944 1,469  
Other long-term financial liabilities, undiscounted cash flows 241 4  
Financial liabilities, undiscounted cash flows 22,322 23,672  
Net interest payments 11,912 13,480  
Liquidity risk | Expenditure derivative instruments:      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Derivative financial liabilities 0 0  
Derivative financial liabilities, undiscounted cash flows 4,418 2,124  
Financial assets held for managing liquidity risk (4,487) (2,288)  
Liquidity risk | Expenditure derivative instruments: | Less than 1 year      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Derivative financial liabilities, undiscounted cash flows 2,257 1,605  
Financial assets held for managing liquidity risk (2,276) (1,727)  
Liquidity risk | Expenditure derivative instruments: | 1-3 Years      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Derivative financial liabilities, undiscounted cash flows 1,759 519  
Financial assets held for managing liquidity risk (1,790) (561)  
Liquidity risk | Expenditure derivative instruments: | 4-5 years      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Derivative financial liabilities, undiscounted cash flows 111 0  
Financial assets held for managing liquidity risk (114) 0  
Liquidity risk | Expenditure derivative instruments: | After 5 years      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Derivative financial liabilities, undiscounted cash flows 291 0  
Financial assets held for managing liquidity risk (307) 0  
Liquidity risk | Equity derivative instruments      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Derivative financial liabilities 0 0  
Derivative financial liabilities, undiscounted cash flows (28) (54)  
Liquidity risk | Equity derivative instruments | Less than 1 year      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Derivative financial liabilities, undiscounted cash flows (28) (54)  
Liquidity risk | Equity derivative instruments | 1-3 Years      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Derivative financial liabilities, undiscounted cash flows 0 0  
Liquidity risk | Equity derivative instruments | 4-5 years      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Derivative financial liabilities, undiscounted cash flows 0 0  
Liquidity risk | Equity derivative instruments | After 5 years      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Derivative financial liabilities, undiscounted cash flows 0 0  
Liquidity risk | Subsidiary equity derivative instruments      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Derivative financial liabilities 0    
Derivative financial liabilities, undiscounted cash flows 10,321    
Financial assets held for managing liquidity risk (10,651)    
Liquidity risk | Subsidiary equity derivative instruments | Less than 1 year      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Derivative financial liabilities, undiscounted cash flows 481    
Financial assets held for managing liquidity risk (533)    
Liquidity risk | Subsidiary equity derivative instruments | 1-3 Years      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Derivative financial liabilities, undiscounted cash flows 962    
Financial assets held for managing liquidity risk (1,065)    
Liquidity risk | Subsidiary equity derivative instruments | 4-5 years      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Derivative financial liabilities, undiscounted cash flows 962    
Financial assets held for managing liquidity risk (1,065)    
Liquidity risk | Subsidiary equity derivative instruments | After 5 years      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Derivative financial liabilities, undiscounted cash flows 7,916    
Financial assets held for managing liquidity risk (7,988)    
Liquidity risk | Debt derivative instruments      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Derivative financial liabilities   0  
Derivative financial liabilities, undiscounted cash flows   1,958  
Financial assets held for managing liquidity risk   (1,963)  
Liquidity risk | Debt derivative instruments | Less than 1 year      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Derivative financial liabilities, undiscounted cash flows   1,958  
Financial assets held for managing liquidity risk   (1,963)  
Liquidity risk | Debt derivative instruments | 1-3 Years      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Derivative financial liabilities, undiscounted cash flows   0  
Financial assets held for managing liquidity risk   0  
Liquidity risk | Debt derivative instruments | 4-5 years      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Derivative financial liabilities, undiscounted cash flows   0  
Financial assets held for managing liquidity risk   0  
Liquidity risk | Debt derivative instruments | After 5 years      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Derivative financial liabilities, undiscounted cash flows   0  
Financial assets held for managing liquidity risk   0  
Liquidity risk | Debt derivative instruments | Cash flow hedges      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Derivative financial liabilities 0 0  
Derivative financial liabilities, undiscounted cash flows 21,030 22,506  
Financial assets held for managing liquidity risk (22,402) (25,421)  
Liquidity risk | Debt derivative instruments | Cash flow hedges | Less than 1 year      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Derivative financial liabilities, undiscounted cash flows 990 2,572  
Financial assets held for managing liquidity risk (1,010) (2,758)  
Liquidity risk | Debt derivative instruments | Cash flow hedges | 1-3 Years      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Derivative financial liabilities, undiscounted cash flows 2,865 3,565  
Financial assets held for managing liquidity risk (3,054) (3,957)  
Liquidity risk | Debt derivative instruments | Cash flow hedges | 4-5 years      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Derivative financial liabilities, undiscounted cash flows 3,259 1,684  
Financial assets held for managing liquidity risk (3,225) (1,799)  
Liquidity risk | Debt derivative instruments | Cash flow hedges | After 5 years      
Disclosure Of Maturity Analysis For Derivative And Non-derivative Financial Liabilities [Line Items]      
Derivative financial liabilities, undiscounted cash flows 13,916 14,685  
Financial assets held for managing liquidity risk $ (15,113) $ (16,907)