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Per Share Amounts - Preferred Share Dividends (Details) - CAD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Earnings per share [line items] |  |  |  |
Total Declared and Paid Preferred Share Dividends | $ 8 | $ 8 | $ 17 | $ 17
Series 1 First Preferred Shares |  |  |  |
Earnings per share [line items] |  |  |  |
Total Declared and Paid Preferred Share Dividends | 2 | 2 | 4 | 4
Series 2 First Preferred Shares |  |  |  |
Earnings per share [line items] |  |  |  |
Total Declared and Paid Preferred Share Dividends | 0 | 0 | 0 | 0
Series 3 First Preferred Shares |  |  |  |
Earnings per share [line items] |  |  |  |
Total Declared and Paid Preferred Share Dividends | 3 | 3 | 6 | 6
Series 5 First Preferred Shares |  |  |  |
Earnings per share [line items] |  |  |  |
Total Declared and Paid Preferred Share Dividends | 2 | 2 | 4 | 4
Series 7 First Preferred Shares |  |  |  |
Earnings per share [line items] |  |  |  |
Total Declared and Paid Preferred Share Dividends | $ 1 | $ 1 | $ 3 | $ 3

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