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Capital Structure Financial Policies (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2022
CAD ($)
Dec. 31, 2021
CAD ($)
Dec. 31, 2020
CAD ($)
Capital Structure Financial Policies      
Maximum percentage of total debt to total debt plus shareholders' equity allowed under terms of financial covenants 65.00%    
Percentage of total debt to total debt plus shareholders' equity 28.40%    
Components of Ratio      
Short-term debt $ 2,807 $ 1,284  
Current portion of long - term debt   231  
Current portion of long-term lease liabilities 317 310  
Long-term debt 9,800 13,989  
Long-term lease liabilities 2,695 2,540  
Total debt 15,619 18,354  
Less: Cash and cash equivalents 1,980 2,205 $ 1,885
Net debt 13,639 16,149  
Shareholders' equity 39,367 36,614 $ 35,757
Total capitalization (total debt plus shareholders' equity) 54,986 54,968  
Adjusted funds from operations $ 18,101 $ 10,257  
Net debt to adjusted funds from operations 0.8 1.6  
Total debt to total debt plus shareholders' equity 28.4 33.4  
Net debt to adjusted funds from operations multiplier 3.0    
Minimum      
Components of Ratio      
Capital measure target, percentage of total debt to total debt plus shareholders' equity 20.00% 20.00%  
Maximum      
Components of Ratio      
Capital measure target, percentage of total debt to total debt plus shareholders' equity 35.00% 35.00%