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Preferred Shares - Issued and Outstanding (Details) - CAD ($) shares in Millions, $ in Millions | Dec. 31, 2024 | Sep. 30, 2024 | Dec. 31, 2023
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Preferred Shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of shares outstanding (in shares) | 38.6 |  | 38.6
Number of shares issued (in shares) | 38.6 |  | 38.6
Amount | $ 942 |  | $ 942
Series A |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of shares outstanding (in shares) | 9.6 |  | 9.6
Number of shares issued (in shares) | 9.6 |  | 9.6
Amount | $ 235 |  | $ 235
Series B |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of shares outstanding (in shares) | 2.4 |  | 2.4
Number of shares issued (in shares) | 2.4 |  | 2.4
Amount | $ 58 |  | $ 58
Series C |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of shares outstanding (in shares) | 10.0 | 6.6 | 10.0
Number of shares issued (in shares) | 10.0 |  | 10.0
Amount | $ 243 |  | $ 243
Series D |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of shares outstanding (in shares) | 1.0 |  | 1.0
Number of shares issued (in shares) | 1.0 |  | 1.0
Amount | $ 26 |  | $ 26
Series E |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of shares outstanding (in shares) | 9.0 |  | 9.0
Number of shares issued (in shares) | 9.0 |  | 9.0
Amount | $ 219 |  | $ 219
Series G |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of shares outstanding (in shares) | 6.6 |  | 6.6
Number of shares issued (in shares) | 6.6 |  | 6.6
Amount | $ 161 |  | $ 161

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