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Share Capital and Warrants - Issued and Outstanding - Preferred Shares (Details) - Preferred Shares - CAD ($) shares in Thousands, $ in Millions | 3 Months Ended | 9 Months Ended | 60 Months Ended
--- | --- | --- | ---
Dec. 29, 2021 | Sep. 29, 2021 | Mar. 31, 2021 | Sep. 30, 2021 | Mar. 30, 2026
Disclosure of classes of share capital [Line Items] |  |  |  |  |
Shares outstanding (in shares) |  |  |  | 36,000 |
Number of Preferred Shares |  |  |  |  |
Outstanding, Beginning of Year | 36,000 |  | 0 | 0 |
Issued Under the Arrangement, Net of Issuance Costs |  |  |  | 36,000 |
Outstanding, End of Period |  |  |  | 36,000 |
Amount |  |  |  |  |
Outstanding, Beginning of Year | $ 519 |  | $ 0 | $ 0 |
Issued Under the Arrangement, Net of Issuance Costs |  |  |  | 519 |
Outstanding, End of Period |  |  |  | $ 519 |
Series 1 First Preferred Shares |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |
Dividend Rate |  |  | 2.40% | 2.58% | 2.58%
Shares outstanding (in shares) |  |  |  | 10,740 |
Number of Preferred Shares |  |  |  |  |
Outstanding, Beginning of Year | 10,740 |  |  |  |
Outstanding, End of Period |  |  |  | 10,740 |
Series 2 First Preferred Shares |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |
Dividend Rate | 1.92% | 1.84% |  | 1.92% |
Shares outstanding (in shares) |  |  |  | 1,260 |
Number of Preferred Shares |  |  |  |  |
Outstanding, Beginning of Year | 1,260 |  |  |  |
Outstanding, End of Period |  |  |  | 1,260 |
Series 3 First Preferred Shares |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |
Dividend Rate |  |  |  | 4.69% |
Shares outstanding (in shares) |  |  |  | 10,000 |
Number of Preferred Shares |  |  |  |  |
Outstanding, Beginning of Year | 10,000 |  |  |  |
Outstanding, End of Period |  |  |  | 10,000 |
Series 5 First Preferred Shares |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |
Dividend Rate |  |  |  | 4.59% |
Shares outstanding (in shares) |  |  |  | 8,000 |
Number of Preferred Shares |  |  |  |  |
Outstanding, Beginning of Year | 8,000 |  |  |  |
Outstanding, End of Period |  |  |  | 8,000 |
Series 7 First Preferred Shares |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |
Dividend Rate |  |  |  | 3.94% |
Shares outstanding (in shares) |  |  |  | 6,000 |
Number of Preferred Shares |  |  |  |  |
Outstanding, Beginning of Year | 6,000 |  |  |  |
Outstanding, End of Period |  |  |  | 6,000 |

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