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Cumulative Preferred Stock (Summary of Cumulative Preferred Stock Authorized) (Details) - CAD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023
Class of Stock [Line Items] |  |
Issued and Outstanding | 58,000,000 | 58,000,000
Net Proceeds | $ 1,422 | $ 1,422
Series A Preferred Stock |  |
Class of Stock [Line Items] |  |
Annual Dividend Per Share | $ 0.5456 |
Preferred Stock, Redemption Price Per Share | $ 25.00 |
Issued and Outstanding | 4,866,814 | 4,866,814
Net Proceeds | $ 119 | $ 119
Series B Preferred Stock |  |
Class of Stock [Line Items] |  |
Preferred Stock, Redemption Price Per Share | $ 25.00 |
Issued and Outstanding | 1,133,186 | 1,133,186
Net Proceeds | $ 28 | $ 28
Preferred Stock Dividend Payment Rate Variable | Floating |
Series C Preferred Stock |  |
Class of Stock [Line Items] |  |
Annual Dividend Per Share | $ 1.6085 |
Preferred Stock, Redemption Price Per Share | $ 25.00 |
Issued and Outstanding | 10,000,000 | 10,000,000
Net Proceeds | $ 245 | $ 245
Series E Preferred Stock |  |
Class of Stock [Line Items] |  |
Annual Dividend Per Share | $ 1.1250 |
Preferred Stock, Redemption Price Per Share | $ 25.00 |
Issued and Outstanding | 5,000,000 | 5,000,000
Net Proceeds | $ 122 | $ 122
Series F Preferred Stock |  |
Class of Stock [Line Items] |  |
Annual Dividend Per Share | $ 1.0505 |
Preferred Stock, Redemption Price Per Share | $ 25.00 |
Issued and Outstanding | 8,000,000 | 8,000,000
Net Proceeds | $ 195 | $ 195
Series H Preferred Stock |  |
Class of Stock [Line Items] |  |
Annual Dividend Per Share | $ 1.5810 |
Preferred Stock, Redemption Price Per Share | $ 25.00 |
Issued and Outstanding | 12,000,000 | 12,000,000
Net Proceeds | $ 295 | $ 295
Series J Preferred Stock |  |
Class of Stock [Line Items] |  |
Annual Dividend Per Share | $ 1.0625 |
Preferred Stock, Redemption Price Per Share | $ 25.00 |
Issued and Outstanding | 8,000,000 | 8,000,000
Net Proceeds | $ 196 | $ 196
Series L Preferred Stock |  |
Class of Stock [Line Items] |  |
Annual Dividend Per Share | $ 1.1500 |
Preferred Stock, Redemption Price Per Share | $ 26.00 |
Issued and Outstanding | 9,000,000 | 9,000,000
Net Proceeds | $ 222 | $ 222

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