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Fair Value of Financial Instruments and Risk Management - Derivative Contracts Under Master Netting Agreements and Collateral Positions (Details) - Energy Contracts - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Derivative assets |  |
Gross Amount Recognized In Balance Sheet | $ 70 | $ 55
Counterparty Netting of Energy Contracts | (30) | (24)
Cash Collateral Posted/(Received) | 15 | 28
Net Amount | 55 | 59
Derivative liabilities |  |
Gross Amount Recognized In Balance Sheet | (199) | (212)
Counterparty Netting of Energy Contracts | 30 | 24
Cash Collateral Posted/(Received) | 0 | (1)
Net Amount | $ (169) | $ (189)

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