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Common Stock (Narrative) (Details) - CAD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Debt Instrument [Line Items] |  |
Gross proceeds from Issuance of Common Stock | $ 284 | $ 424
Percentage of outstanding stock maximum | 10.00% |
Common Stock |  |
Debt Instrument [Line Items] |  |
Issuance of common stock (shares) | 5,120,000 | 8,290,000
ATM Program |  |
Debt Instrument [Line Items] |  |
Maximum common stock issued from treasury amount | $ 1 |
ATM Program | Common Stock |  |
Debt Instrument [Line Items] |  |
Remaining available authorized amount for issuance | $ 336 |
Issuance of common stock (shares) | 5,117,273 | 8,287,037
Gross proceeds from Issuance of Common Stock | $ 264 | $ 400
Net proceeds from issuance of common stock | $ 261 | $ 397
Average price per share, issued | $ 51.52 | $ 48.27
Employee Stock Option Plan |  |
Debt Instrument [Line Items] |  |
Common Stock, Capital Shares Reserved for Future Issuance | 6,000,000 | 6,000,000
Share Unit Plans |  |
Debt Instrument [Line Items] |  |
Common Stock, Capital Shares Reserved for Future Issuance | 2,000,000 | 2,000,000
Dividend Reinvestment |  |
Debt Instrument [Line Items] |  |
Common Stock, Capital Shares Reserved for Future Issuance | 12,000,000 | 18,000,000

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