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Commitments, Guarantees and Contingencies - Lease Commitments, Contractual Commitments, and Letters of Credit (Details) - CAD ($)
Dec. 31, 2019
Dec. 31, 2018
Other Provisions, Contingent Liabilities And Contingent Assets [Abstract]    
Total future rental payments for the remainder of the operating leases $ 1,114,000,000  
Contractual commitments outstanding 3,583,000,000 $ 3,800,000,000
Maximum borrowing capacity 859,000,000 891,000,000
Letters of credit outstanding $ 214,000,000 $ 227,000,000