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Financial Instruments - Summary of Offsetting Risk Management Positions (Detail) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Gross Amount, Risk Management Asset $ 153 $ 263
Amount Offset, Risk Management Asset (60) (215)
Net Amount per Consolidated Financial Statements, Risk Management Asset 93 48
Gross Amount, Risk Management Liabilities 107 331
Amount Offset, Risk Management Liabilities (60) (215)
Net Amount per Consolidated Financial Statements, Risk Management Liabilities 47 116
Gross Amount, Risk Management Net 46 (68)
Amount Offset, Risk Management Net 0 0
Net Amount per Consolidated Financial Statements, Risk Management Net $ 46 $ (68)