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Trade receivables - Analysis of past due receivables (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of provision matrix [line items] |  |  |  |
Trade receivables, gross | $ 1,438 | $ 1,307 |  |
Provisions for doubtful trade receivables | (48) | (54) | $ (77) | $ (55)
Total trade receivables, net | 1,390 | 1,253 |  |
Not overdue [member] |  |  |  |
Disclosure of provision matrix [line items] |  |  |  |
Trade receivables, gross | 1,135 | 1,018 |  |
Past due for not more than one month [member] |  |  |  |
Disclosure of provision matrix [line items] |  |  |  |
Trade receivables, gross | 118 | 118 |  |
Past due for more than one month but less than three months [member] |  |  |  |
Disclosure of provision matrix [line items] |  |  |  |
Trade receivables, gross | 81 | 70 |  |
Past due for more than three months but less than six months [member] |  |  |  |
Disclosure of provision matrix [line items] |  |  |  |
Trade receivables, gross | 47 | 34 |  |
Past due for more than six months but less than one year [member] |  |  |  |
Disclosure of provision matrix [line items] |  |  |  |
Trade receivables, gross | 21 | 20 |  |
Past due for more than one year [member] |  |  |  |
Disclosure of provision matrix [line items] |  |  |  |
Trade receivables, gross | $ 36 | $ 47 |  |

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- Definition The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b -URIDate 2019-03-27 + Details
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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. + Details
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- Definition The amount due from customers for goods and services sold. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 78 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_78_b&doctype=Standard -URIDate 2019-03-27 + Details
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- Details
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- Details
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