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Shareholders' equity - Summary of Issued Capital (Detail) - CAD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Disclosure of classes of share capital [line items] |  |  |  |
Balance, beginning of year |  | $ 2,187 |  |
Issued on exercise of equity compensation plans |  | 2 | $ 3 |
Balance, end of year |  | 2,187 |  | $ 2,187
Common shares [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Balance, beginning of year |  | 2,187 | $ 2,185 | 2,185
Issued on exercise of equity compensation plans | [1] | 0 |  | 2
Balance, end of year |  | $ 2,187 |  | $ 2,187
Balance, beginning of year |  | 73,011,488 | 72,473,719 | 72,473,719
Issued on exercise of equity compensation plans | [1] | 495,255 |  | 537,769
Balance, end of year |  | 73,506,743 |  | 73,011,488
[1] | Upon vesting or exercise of equity awards, the net benefit is recorded as a reduction of other reserves and an increase to shareholders’ capital.

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