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Financial Instruments and Risk Management - Non Designated Derivative Financial Instruments (Details) - Non-Designated Derivative Financial Instruments - At fair value - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Financial Instruments and Risk Management |  |
Fair value outstanding, beginning of year | $ (65) | $ (98)
Changes in fair value recognized in earnings during the year | 25 | (187)
Cash settlements - paid (received) during the year | 20 | 220
Fair value outstanding, end of year | $ (20) | $ (65)

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