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Preferred Shares - Issued and Outstanding (Details) - CAD ($) shares in Millions, $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022
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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 | 10.0 | 11.0
Number of shares issued (in shares) | 10.0 | 10.0 | 11.0
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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