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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
	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)

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No definition available.

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- Definition

Increase (Decrease) In Other Payments For Business Combination

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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

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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

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