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Share Capital - Preferred Shares Issued and Outstanding (Details) - CAD ($) shares in Millions |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 | Sep. 29, 2021 | Jun. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2021 | May 31, 2020
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Senior debentures | $ 200,000,000 |  |  |  | $ 200,000,000 | $ 500,000,000 |  |
Redemption of preferred shares and other equity instruments |  |  |  |  | $ 1,025,000,000 | $ 0 |  |
Series 2021-1 |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Senior debentures |  |  |  |  |  |  | $ 1,000,000,000 |
Interest rate |  |  |  |  |  |  | 3.60% |
Number of shares (in shares) | 1.0 |  |  |  | 1.0 |  |  |
Series 2021-1 | Canadian federal government |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 2.604% |
Series 14 |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Senior debentures |  |  |  |  |  |  | $ 1,000,000 |
Series 1 |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Redemption of preferred shares and other equity instruments |  |  | $ 400,000,000 |  |  |  |  |
Series 2 |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Redemption of preferred shares and other equity instruments |  |  | $ 325,000,000 |  |  |  |  |
Series 10R |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Number of shares converted (in shares) |  | 0.5 |  |  |  |  |  |
Number of shares (in shares) | 6.8 | 6.8 | 6.9 |  | 6.8 |  |  |
Series 11QR |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Number of shares converted (in shares) |  | 0.4 |  |  |  |  |  |
Number of shares (in shares) | 1.2 | 1.2 | 1.1 |  | 1.2 |  |  |
Series 12R |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Redemption of preferred shares and other equity instruments | $ 300,000,000 |  |  |  |  |  |  |
Series 8R |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Number of shares converted (in shares) |  |  |  | 0.1 |  |  |  |
Number of shares (in shares) | 6.2 |  |  | 6.2 | 6.2 |  |  | 5.2
Series 9QR |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |
Number of shares converted (in shares) |  |  |  | 1.1 |  |  |  |
Number of shares (in shares) | 5.0 |  |  | 5.0 | 5.0 |  |  | 6.0

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