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Financial Instruments - Summary of maturity analysis for financial assets held for managing liquidity risk (Parenthetical ) (Detail) - Performance Guaranteed By Export Development Canada [Member] - Secured Revolving Credit Facility [Member]
$ in Millions
Dec. 31, 2024
USD ($)
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Debt instrument current borrowing capacity $ 70
Letters of Credit [Member]  
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]  
Debt instrument current borrowing capacity 70
Cumulative Amount Utilised Out Of The Total Borrowing Capacity $ 29