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Consolidated statement of cash flows - additional details - Cash flows arising from acquisitions of businesses (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash Flow Statement [Abstract] |  |  |
Net assets recognized as a result of business combinations | $ 0 | $ (418) | $ (286)
Payables contingent consideration | 0 | 135 | 102
Other payments | 0 | 0 | (55)
Cash flows | $ 0 | $ (283) | $ (239)

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- Definition Cash Flow Statement [Abstract] + References No definition available. + Details
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- Definition Increase (Decrease) In Identifiable Assets Acquired (Liabilities Assumed) + References No definition available. + Details
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- Definition Increase (Decrease) In Other Payments For Business Combination + References No definition available. + Details
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- Definition The amount of consideration paid or received in respect of both obtaining and losing control of subsidiaries or other businesses. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 40 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_40_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in a contingent consideration asset (liability) relating to a business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2020-01-01 -Paragraph B67 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2020-en-r&anchor=para_B67_b_i&doctype=Appendix&subtype=B -URIDate 2020-01-01 + Details
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