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Shareholders' capital - Common Shares (Detail) - shares	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Common Shares Rollforward
Beginning balance (in shares)	683,614,803	671,960,276
Dividend reinvestment plan (in shares)	4,370,289	3,014,264
Exercise of share-based awards (in shares)	772,591	673,852
Conversion of convertible debentures (in shares)	1,415	754
Ending balance (in shares)	688,759,098	675,649,146

X

- Definition

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

+ References

No definition available.

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X

- Definition

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

+ References

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-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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X

- 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.

+ References

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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, 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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