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Preferred Shares - Issued and Outstanding (Details) - CAD ($) shares in Millions, $ in Millions | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
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Preferred Shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of shares outstanding | 38.6 |  | 38.6
Number of shares issued and outstanding | 38.6 |  | 38.6
Issued capital (Note 25) | $ 942 |  | $ 942
Series A |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of shares outstanding | 9.6 | 9.6 | 10.2
Number of shares issued and outstanding | 9.6 | 9.6 | 10.2
Issued capital (Note 25) | $ 235 |  | $ 248
Series B |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of shares outstanding | 2.4 | 2.4 | 1.8
Number of shares issued and outstanding | 2.4 | 2.4 | 1.8
Issued capital (Note 25) | $ 58 |  | $ 45
Series C |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of shares outstanding | 11.0 |  | 11.0
Number of shares issued and outstanding | 11.0 |  | 11.0
Issued capital (Note 25) | $ 269 |  | $ 269
Series E |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of shares outstanding | 9.0 |  | 9.0
Number of shares issued and outstanding | 9.0 |  | 9.0
Issued capital (Note 25) | $ 219 |  | $ 219
Series G |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of shares outstanding | 6.6 |  | 6.6
Number of shares issued and outstanding | 6.6 |  | 6.6
Issued capital (Note 25) | $ 161 |  | $ 161

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