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Leases - Lease Liabilities (Details) - CAD ($)
 12 Months Ended
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Lease liabilities [abstract]      
Lease liabilities $ 1,809,000,000 $ 1,539,000,000 $ 0
Less: current portion 233,000,000    
Non-current lease liabilities 1,576,000,000 $ 1,539,000,000  
Expenses relating to short-term leases 448,000,000    
Interest expense on lease liabilities 70,000,000    
Variable lease payments not included in the measurement of lease liabilities 118,000,000    
Total cash outflows for leases 1,178,000,000    
Increase through capitalization of short-term leases, property, plant and equipment $ 305,000,000