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Financial instruments - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Commodity price sensitivity [member]
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Percentage of reasonably possible change, market risk	30.00%
Level 3 [member]
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Total gains and losses recognised in statement of income, assets	$ 109	$ 4
Gains on change in fair value of derivatives	147
Level 3 [member] | Certain earn-out agreements [member]
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Total gains and losses recognised in statement of income, assets	28
Extrapolation approach [member] | Level 3 [member] | Certain earn-out agreements [member]
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
The amount of increase (decrease) in the fair value of asset	$ 100

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- Definition

The reasonably possible percentage of the increase (decrease) market risk sensitivity.

+ References

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The gains (losses) including exchange differences recognised in profit or loss on the fair value measurement of assets. [Refer: At fair value [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2019-01-01
-Paragraph 93
-Subparagraph e
-Clause i
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-URIDate 2019-03-27

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- Definition

The gains resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2019-01-01
-Paragraph 85
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- Definition

The amount of increase (decrease) in the fair value measurement of assets due to a reasonably possible increase in an unobservable input.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2019-01-01
-Paragraph 93
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