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Leases - Impacts to the Consolidated Financial Statements on Transition (Details) - CAD ($)
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Disclosure of leases [Abstract]      
Right-of-use assets $ 1,789,000,000 $ 1,539,000,000  
Lease liabilities $ 1,809,000,000 $ 1,539,000,000 $ 0
Weighted average lessee's incremental borrowing rate applied to lease liabilities recognised at date of initial application of IFRS 16   4.00%  
Leases previously reported as commitments at December 31, 2018     $ 1,430,000,000
Impact of discounting   $ (317,000,000)  
Leases previously reported as commitments, discounted at January 1, 2019   1,113,000,000  
Lease extension options and renewals reasonably certain to be exercised   243,000,000  
Arrangements determined to be leases under IFRS 16   83,000,000  
Leases entered into on behalf of a joint operation   $ 100,000,000