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Commitments, Guarantees and Contingencies - Lease Commitments, Contractual Commitments, and Letters of Credit (Details) - CAD ($)
Dec. 31, 2023
Dec. 31, 2022
Other Provisions, Contingent Liabilities And Contingent Assets [Abstract]    
Total future rental payments for the remainder of the operating leases $ 1,269,000,000 $ 1,000,000,000
Contractual commitments outstanding 4,909,000,000 5,070,000,000
Maximum borrowing capacity 874,000,000 889,000,000
Letters of credit outstanding $ 113,000,000 $ 110,000,000