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Sale Of Cedar Point (Details) - CAD ($)
$ in Millions
 12 Months Ended
Jan. 01, 2017
Dec. 31, 2018
Dec. 31, 2017
Non Current Assets Or Disposal Groups Classified As Held For Sale [Line Items]      
Gain on disposal of assets   $ 24 $ 602
Assets      
Property, plant and equipment, net   74,245 73,493
Total assets   89,579 89,494
Liabilities      
Other non-current liabilities   2,346 2,412
Provisions   6,984 $ 7,237
Cedar Point Wind Facility      
Non Current Assets Or Disposal Groups Classified As Held For Sale [Line Items]      
Proceeds from sale of cedar point $ 291    
Gain on disposal of assets   83  
Current tax expense   29  
Deferred tax recovery   $ 15