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Preferred Shares - Issued and Outstanding (Details) - CAD ($) shares in Millions, $ in Millions | Dec. 31, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Mar. 31, 2021
--- | --- | --- | --- | ---
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 | 10.2
Number of shares issued (in shares) | 9.6 |  | 9.6 | 10.2
Amount | $ 235 |  | $ 235 |
Series B |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Number of shares outstanding (in shares) | 2.4 |  | 2.4 | 1.8
Number of shares issued (in shares) | 2.4 |  | 2.4 | 1.8
Amount | $ 58 |  | $ 58 |
Series C |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Number of shares outstanding (in shares) | 10.0 | 11.0 | 11.0 |
Number of shares issued (in shares) | 10.0 | 11.0 | 11.0 |
Amount | $ 243 |  | $ 269 |
Series D |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Number of shares outstanding (in shares) | 1.0 |  | 0.0 |
Number of shares issued (in shares) | 1.0 |  | 0.0 |
Amount | $ 26 |  | $ 0 |
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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