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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, 2022 | Dec. 31, 2021
Financial Instruments and Risk Management |  |
Fair value outstanding, beginning of year | $ (98) | $ (121)
Cash settlements - paid during the year | 220 | 178
Changes in fair value recognized in earnings during the year | (187) | (155)
Fair value outstanding, end of year | $ (65) | $ (98)

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