per share amounts (Details) - shares shares in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Effect of dilutive securities
Basic total weighted average number of Common Shares outstanding	1,381	1,355	1,378	1,327
Effect of dilutive securities - Restricted share units	6	4	6	4
Diluted total weighted average number of Common Shares outstanding	1,387	1,359	1,384	1,331
Restricted stock units RSU [member]
Effect of dilutive securities
Outstanding share awards excluded in the calculation of diluted net income per Common Share	0	0	0	0
Share option awards
Effect of dilutive securities
Outstanding share awards excluded in the calculation of diluted net income per Common Share	0		0
Share option awards \| Maximum
Effect of dilutive securities
Outstanding share awards excluded in the calculation of diluted net income per Common Share		1		1

The number of dilutive potential ordinary shares that relate to the assumed exercise of the entity's share options.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 33
-IssueDate 2021-01-01
-Paragraph 70
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2021-en-r&anchor=para_70_b&doctype=Standard
-URIDate 2021-03-24

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- Definition

The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 33
-IssueDate 2021-01-01
-Paragraph 70
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2021-en-r&anchor=para_70_b&doctype=Standard
-URIDate 2021-03-24

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- Definition

The number of dilutive restricted share units that relate to the assumed exercise of the entity's share options.

+ References

No definition available.

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- Definition

The effect of dilutive securities on the earnings per share computations.

+ References

No definition available.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the calculation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

No definition available.

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