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Shareholders' capital - Common Shares (Detail) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Common Shares Rollforward
Beginning balance (in shares)	524,223,323	488,851,433
Public offering and subscription receipts (in shares)	66,130,063	28,009,341
Dividend reinvestment plan (in shares)	5,217,071	6,068,465
Exercise of share-based awards	1,565,537	1,274,655
Conversion of convertible debentures (in shares)	6,225	19,429
Ending balance (in shares)	597,142,219	524,223,323

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- Definition

Stock Issued During Period, Shares, Dividend reinvestment and Employee Stock Purchase Plan

+ References

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- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Number of new stock issued during the period.

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Number, after forfeiture, of shares or units issued under share-based payment arrangement. Excludes shares or units issued under employee stock ownership plan (ESOP).

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