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Financial Instruments and Risk Management - Offsetting Financial Liabilities (Details) - CAD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Fair value of derivative liabilities |  |
Financial Instruments and Risk Management |  |
Gross Liabilities | $ (4,370) | $ (6,625)
Gross Assets Offset | 4,162 | 6,404
Net Amounts Presented | (208) | (221)
Accounts payable |  |
Financial Instruments and Risk Management |  |
Gross Liabilities | (10,036) | (4,205)
Gross Assets Offset | 8,633 | 2,734
Net Amounts Presented | (1,403) | (1,471)
Financial liabilities |  |
Financial Instruments and Risk Management |  |
Gross Liabilities | (14,406) | (10,830)
Gross Assets Offset | 12,795 | 9,138
Net Amounts Presented | $ (1,611) | $ (1,692)

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