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Share capital - Narrative (Details) $ / shares in Units, $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Feb. 24, 2022 CAD ($) $ / shares shares | Dec. 31, 2021 CAD ($) vote shares | Dec. 31, 2020 CAD ($) shares | Nov. 03, 2021
Disclosure of classes of share capital [line items] |  |  |  |
Shares redeemed, value | $ |  | $ 297 | $ 263 |
Maximum |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Percentage of public float |  |  |  | 10.00%
Preferred shares |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Special circumstance vote per share | vote |  | 1 |  |
Share conversion ratio |  | 1 |  |
Number of shares outstanding (in shares) |  | 160,258,600 |  |
Series R |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Dividend rate reset term |  | 5 years |  |
Number of shares outstanding (in shares) |  | 7,998,900 |  |
Series T |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Dividend rate reset term |  | 5 years |  |
Number of shares outstanding (in shares) |  | 5,870,133 |  |
Series Z |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Dividend rate reset term |  | 5 years |  |
Number of shares outstanding (in shares) |  | 1,918,509 |  |
Series AA |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Dividend rate reset term |  | 5 years |  |
Number of shares outstanding (in shares) |  | 11,397,196 |  |
Series AC |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Dividend rate reset term |  | 5 years |  |
Number of shares outstanding (in shares) |  | 10,027,991 |  |
Series AF |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Dividend rate reset term |  | 5 years |  |
Number of shares outstanding (in shares) |  | 9,481,487 |  |
Series AG |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Dividend rate reset term |  | 5 years |  |
Number of shares outstanding (in shares) |  | 8,979,530 |  |
Series AI |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Dividend rate reset term |  | 5 years |  |
Number of shares outstanding (in shares) |  | 9,535,040 |  |
Series AK |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Dividend rate reset term |  | 5 years |  |
Number of shares outstanding (in shares) |  | 23,190,312 |  |
Series AM |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Dividend rate reset term |  | 5 years |  |
Number of shares outstanding (in shares) |  | 10,439,978 |  |
Series AO |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Dividend rate reset term |  | 5 years |  |
Number of shares outstanding (in shares) |  | 4,600,000 |  |
Series AO | Major ordinary share transactions [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Shares redeemed (in shares) | 4,600,000 |  |  |
Redemption price per share (in CAD per share) | $ / shares | $ 25 |  |  |
Shares redeemed, value | $ | $ 115 |  |  |
Series AQ |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Dividend rate reset term |  | 5 years |  |
Number of shares outstanding (in shares) |  | 9,200,000 |  |
Class B | Issued capital |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Number of shares outstanding (in shares) |  | 0 | 0 |

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