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Common Stock (Summary of Issued and Outstanding Common Stock) (Details) - CAD ($) shares in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Increase (Decrease) In Common Stock Value [Roll Forward] |  |
Beginning Balance | $ 8,462 |
Issuance of common stock | 261 | $ 397
Senior management stock options exercised and Employee Share Purchase Plan ("ECSPP") | 30 | 32
Ending Balance | 9,042 | 8,462
Common Stock |  |
Increase (Decrease) In Common Stock Value [Roll Forward] |  |
Beginning Balance | 8,462 | 7,762
Issuance of common stock | 261 | 397
Issued under Purchase Plans at market rate | 291 | 272
Senior management stock options exercised and Employee Share Purchase Plan ("ECSPP") | 28 | 31
Ending Balance | $ 9,042 | $ 8,462
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Beginning Balance | 284,120 | 269,950
Issuance of common stock (shares) | 5,120 | 8,290
Issued under Purchase Plans at market rate | 6,100 | 5,260
Options exercised under senior management share option plan | 600 | 620
Ending Balance | 295,940 | 284,120

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