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Lease Liabilities - Summary of Lease Liabilities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lease Liabilities [Abstract]    
Lease Liabilities, Beginning of Year $ 1,916 $ 1,494
Additions 49 590
Interest Expense 87 82
Lease Payments (284) (232)
Terminations (1) (11)
Modifications (2)  
Re-measurement (2) 15
Exchange Rate Movements and Other (6) (22)
Lease Liabilities, End of Year 1,757 1,916
Less: Current Portion 184 196
Long-Term Portion $ 1,573 $ 1,720