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Capital Disclosures (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of objectives, policies and processes for managing capital [line items]      
Debt to book capitalization 40.00% 37.00%  
Long-term debt, net $ 21,269 $ 20,843  
Total shareholders’ equity $ 32,380 $ 34,991 $ 31,974
Bottom of range      
Disclosure of objectives, policies and processes for managing capital [line items]      
Debt to book capitalization 25.00%    
Top of range      
Disclosure of objectives, policies and processes for managing capital [line items]      
Debt to book capitalization 45.00%    
Debt to book capitalization ratio 65.00%