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Commitments, Guarantees and Contingencies - Lease Commitments, Contractual Commitments, and Letters of Credit (Details) - CAD ($) | Dec. 31, 2021 | Dec. 31, 2020
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Other Provisions, Contingent Liabilities And Contingent Assets [Abstract] |  |
Total future rental payments for the remainder of the operating leases | $ 950,000,000 | $ 1,082,000,000
Contractual commitments outstanding | 4,211,000,000 | 3,583,000,000
Maximum borrowing capacity | 839,000,000 | 846,000,000
Letters of credit outstanding | $ 105,000,000 | $ 122,000,000

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