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Share Capital - Preferred Shares (Details) - CAD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 | Sep. 29, 2021 | Jun. 30, 2020 | May 31, 2020
Preferred shares |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of shares (in shares) | 52.2 |  |  |  |
Face amount | $ 2,280 |  |  |  |
Net amount | $ 2,239 |  |  |  |
Series 3 |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Annual dividend rate | 4.45% |  |  |  |
Annual dividend per share (in CAD per share) | $ 1.11 |  |  |  |
Number of shares (in shares) | 10.0 |  |  |  |
Face amount | $ 250 |  |  |  |
Net amount | $ 245 |  |  |  |
Series 4 |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Annual dividend rate | 4.45% |  |  |  |
Annual dividend per share (in CAD per share) | $ 1.11 |  |  |  |
Number of shares (in shares) | 12.0 |  |  |  |
Face amount | $ 300 |  |  |  |
Net amount | $ 293 |  |  |  |
Series 5 |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Annual dividend rate | 4.50% |  |  |  |
Annual dividend per share (in CAD per share) | $ 1.13 |  |  |  |
Number of shares (in shares) | 10.0 |  |  |  |
Face amount | $ 250 |  |  |  |
Net amount | $ 245 |  |  |  |
Series 8R |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Annual dividend rate | 1.825% |  |  |  |
Annual dividend per share (in CAD per share) | $ 0.46 |  |  |  |
Number of shares (in shares) | 6.2 |  |  | 6.2 | 5.2
Face amount | $ 155 |  |  |  |
Net amount | $ 152 |  |  |  |
Annual dividend rate spread | 1.41% |  |  |  |
Series 9QR |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of shares (in shares) | 5.0 |  |  | 5.0 | 6.0
Face amount | $ 125 |  |  |  |
Net amount | $ 122 |  |  |  |
Annual dividend rate spread | 1.41% |  |  |  |
Series 10R |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Annual dividend rate | 2.967% |  |  |  |
Annual dividend per share (in CAD per share) | $ 0.72 |  |  |  |
Number of shares (in shares) | 6.8 | 6.8 | 6.9 |  |
Face amount | $ 171 |  |  |  |
Net amount | $ 167 |  |  |  |
Annual dividend rate spread | 2.17% |  |  |  |
Series 11QR |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of shares (in shares) | 1.2 | 1.2 | 1.1 |  |
Face amount | $ 29 |  |  |  |
Net amount | $ 28 |  |  |  |
Annual dividend rate spread | 2.17% |  |  |  |
Series 8R and Series 10R |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Redemption price per share (in CAD per share) | $ 25.00 |  |  |  |
Series 9QR and Series 11QR- on redemption date and every five years thereafter |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Redemption price per share (in CAD per share) | 25.00 |  |  |  |
Preference Shares, Class A, Series 9QR and Series 11QR - on any other date |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Redemption price per share (in CAD per share) | $ 25.50 |  |  |  |
Series 2021-1 |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Annual dividend rate | 3.60% |  |  |  |
Number of shares (in shares) | 1.0 |  |  |  |
Face amount | $ 1,000 |  |  |  |
Net amount | $ 987 |  |  |  |
Annual dividend rate spread | 2.604% |  |  |  |

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