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Financial Instruments - Summary of Offsetting Risk Management Positions (Detail) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Gross Amount, Risk Management Asset $ 263 $ 70
Amount Offset, Risk Management Asset (215) (65)
Net Amount per Consolidated Financial Statements, Risk Management Asset 48 5
Gross Amount, Risk Management Liabilities 331 123
Amount Offset, Risk Management Liabilities (215) (65)
Net Amount per Consolidated Financial Statements, Risk Management Liabilities 116 58
Gross Amount, Risk Management Net (68) (53)
Amount Offset, Risk Management Net 0 0
Net Amount per Consolidated Financial Statements, Risk Management Net $ (68) $ (53)