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Shareholders' capital - Common Shares (Detail) - shares	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Common Shares Rollforward
Beginning balance (in shares)	488,851,433	431,765,935
Public issuance (in shares)	509,431	37,505,274
Dividend reinvestment plan (in shares)	3,225,749	2,532,767
Exercise of share-based awards (in shares)	886,931	352,800
Conversion of convertible debentures (in shares)	11,883	38,138
Ending balance (in shares)	493,485,427	472,194,914

X

- 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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- Definition

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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