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Other Long-Term Liabilities - Schedule of Other Long-Term Liabilities (Details) - CAD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2019
Dec. 31, 2017
Dec. 31, 2016
Subclassifications of assets, liabilities and equities [abstract]          
Asset retirement obligations $ 5,771,000,000 $ 3,886,000,000   $ 4,327,000,000 $ 3,243,000,000
Lease liabilities 1,809,000,000 0 $ 1,539,000,000    
Share-based compensation 297,000,000 124,000,000   $ 414,000,000 $ 426,000,000
Risk management (note 19) 112,000,000 17,000,000      
Deferred purchase consideration 95,000,000 118,000,000      
Other 98,000,000 80,000,000      
Other liabilities 8,182,000,000 4,225,000,000      
Less: current portion 819,000,000 335,000,000      
Other long-term liabilities $ 7,363,000,000 3,890,000,000      
Annual installment amount   $ 25,000,000      
Installment period 4 years 4 years