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v3.20.4

share-based compensation - Employee share purchase plan (Details) - Employee share purchase plan - CAD ($) $ in Millions | 9 Months Ended | 12 Months Ended
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Sep. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
share-based compensation |  |  |  |  |
Dividend reinvestment in Common Shares |  | $ 37 | $ 34 |  |
Purchase plan discount | 0.00% |  |  | 0.00% | 0.00%

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of dividends reinvested in common shares. + References No definition available. + Details
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- Definition Discount rate from fair value on purchase date that participants pay for shares. + References No definition available. + Details
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- Details
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