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Capital Disclosures (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of objectives, policies and processes for managing capital [line items]      
Long-term debt, net $ 20,843 $ 20,522  
Total shareholders’ equity $ 34,991 $ 31,974 $ 31,653
Debt to book capitalization 37.00% 39.00%  
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%