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Derivatives Instruments (Realized and Unrealized Gains (Losses) on HFT Derivatives) (Details) - HFT derivatives - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items] |  |
Realized and unrealized gains (losses) with respect to HFT derivatives | $ 207 | $ 1,037
Operating revenues | Power | Non-Regulated |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Realized and unrealized gains (losses) with respect to HFT derivatives | 12 | (6)
Operating revenues | Natural gas | Non-Regulated |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Realized and unrealized gains (losses) with respect to HFT derivatives | $ 195 | $ 1,043

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