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Equity (Details 4) - USD ($) shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Statement of changes in equity [abstract] |  |  |
Treasury shares acquired to be cancelled | (32.6) | (60.3) | (23.3)
Shares acquired for cancellation, equity impact | $ (2,897) | $ (5,351) | $ (1,859)
Other share purchases | (1.7) | (1.7) | (1.2)
Other share purchases, equity impact | $ (159) | $ (160) | $ (114)
Purchase of treasury shares | (34.3) | (62.0) | (24.5)
Purchase of treasury shares, equity impact | $ (3,056) | $ (5,511) | $ (1,973)
Other share sales |  |  | 3.0
Other share sales, equity impact |  |  | $ 263
Exercise of options and employee transactions shares | 14.7 | 5.5 | 7.8
Exercise of options and employee transactions, equity impact | $ 806 | $ 210 | $ 434
Equity based compensation shares | 11.0 | 9.4 | 7.4
Equity-based compensation, equity impact | $ 730 | $ 833 | $ 756
Shares delivered to divested business employees | 0.4 | 0.9 |
Shares delivered to divested business employees, equity impact | $ 30 | $ 18 |
Total number of outstanding treasury shares | (8.2) | (46.2) | (6.3)
Total equity impact of treasury share movements | $ (1,490) | $ (4,450) | $ (520)

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- Definition The increase (decrease) in equity resulting from the exercise of options. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_106_d&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The increase (decrease) in equity resulting from share-based payment transactions. [Refer: Equity] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 106 -Subparagraph d -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_106_d_iii&doctype=Standard -URIDate 2019-03-27 + Details
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