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Per Share Amounts - Preferred Share Dividends (Details) - CAD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Earnings per share [line items] |  |  |  |
Total Preferred Share Dividends Declared | $ 9 | $ 9 | $ 27 | $ 26
Series 1 First Preferred Shares |  |  |  |
Earnings per share [line items] |  |  |  |
Total Preferred Share Dividends Declared | 2 | 1 | 5 | 5
Series 2 First Preferred Shares |  |  |  |
Earnings per share [line items] |  |  |  |
Total Preferred Share Dividends Declared | 1 | 1 | 2 | 1
Series 3 First Preferred Shares |  |  |  |
Earnings per share [line items] |  |  |  |
Total Preferred Share Dividends Declared | 3 | 3 | 9 | 9
Series 5 First Preferred Shares |  |  |  |
Earnings per share [line items] |  |  |  |
Total Preferred Share Dividends Declared | 2 | 3 | 7 | 7
Series 7 First Preferred Shares |  |  |  |
Earnings per share [line items] |  |  |  |
Total Preferred Share Dividends Declared | $ 1 | $ 1 | $ 4 | $ 4

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