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Derivatives Instruments (Credit Risk) (Narrative) (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 CAD ($) Days | Dec. 31, 2023 CAD ($)
Credit Derivatives [Line Items] |  |
Total cash deposits/collateral on hand | $ 198 | $ 101
Financial Asset, Past Due [Member] |  |
Credit Derivatives [Line Items] |  |
Financial assets, considered to be past due | 140 | 142
Credit Concentration Risk |  |
Credit Derivatives [Line Items] |  |
Concentration Risk, maximum exposure | 1,300 | 1,200
Total cash deposits/collateral on hand | 303 | 310
Credit Concentration Risk | Receivables, net |  |
Credit Derivatives [Line Items] |  |
Fair Value, Financial assets, considered to be past due | $ 128 | $ 127
Average number of days financial asset outstanding | Days | 61 |

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