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Shareholders' capital - Common Shares (Detail) - shares	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Common Shares Rollforward
Beginning balance (in shares)	524,223,323	488,851,433
Public offering and subscription receipts (in shares)	8,664,563	509,431
Dividend reinvestment plan (in shares)	1,911,697	3,225,749
Exercise of share-based awards	1,344,375	886,931
Conversion of convertible debentures (in shares)	1,509	11,883
Ending balance (in shares)	536,145,467	493,485,427

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- Definition

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

+ References

No definition available.

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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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- Definition

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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