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Shareholders' capital - Common Shares (Detail) - shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Common Shares Rollforward
Beginning balance (in shares)	683,614,803	671,960,276
Public offering (in shares)	0	2,861,709
Dividend reinvestment plan (in shares)	4,370,289	7,676,666
Exercise of share-based awards (in shares)	1,284,532	1,115,398
Conversion of convertible debentures (in shares)	1,415	754
Ending balance (in shares)	689,271,039	683,614,803

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- Definition

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

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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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