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Trade receivables - Components of trade receivables (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Disclosure of provision matrix [line items] |  |  |  |
Gross trade receivables | $ 1,429 | $ 1,438 |  |
Provision | (68) | (48) | $ (54) | $ (77)
Total trade receivables, net | 1,361 | 1,390 |  |
Not overdue [member] |  |  |  |
Disclosure of provision matrix [line items] |  |  |  |
Gross trade receivables | 1,137 | 1,135 |  |
Provision | (2) | (1) |  |
Total trade receivables, net | $ 1,135 | $ 1,134 |  |
Expected credit loss rates | 0.20% | 0.10% |  |
Past due for not more than one month [member] |  |  |  |
Disclosure of provision matrix [line items] |  |  |  |
Gross trade receivables | $ 109 | $ 118 |  |
Provision | (1) | (1) |  |
Total trade receivables, net | $ 108 | $ 117 |  |
Expected credit loss rates | 0.90% | 0.80% |  |
Past due for more than one month but less than three months [member] |  |  |  |
Disclosure of provision matrix [line items] |  |  |  |
Gross trade receivables | $ 67 | $ 81 |  |
Provision | (2) | (1) |  |
Total trade receivables, net | $ 65 | $ 80 |  |
Expected credit loss rates | 3.00% | 1.20% |  |
Past due for more than three months but less than six months [member] |  |  |  |
Disclosure of provision matrix [line items] |  |  |  |
Gross trade receivables | $ 36 | $ 47 |  |
Provision | (2) | (2) |  |
Total trade receivables, net | $ 34 | $ 45 |  |
Expected credit loss rates | 5.60% | 4.30% |  |
Past due for more than six months but less than one year [member] |  |  |  |
Disclosure of provision matrix [line items] |  |  |  |
Gross trade receivables | $ 31 | $ 21 |  |
Provision | (18) | (12) |  |
Total trade receivables, net | $ 13 | $ 9 |  |
Expected credit loss rates | 58.10% | 57.10% |  |
Past due for more than one year [member] |  |  |  |
Disclosure of provision matrix [line items] |  |  |  |
Gross trade receivables | $ 49 | $ 36 |  |
Provision | (43) | (31) |  |
Total trade receivables, net | $ 6 | $ 5 |  |
Expected credit loss rates | 87.80% | 86.10% |  |

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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 2020-01-01 -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 2020-01-01 + Details
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- Definition The rate of expected credit losses, calculated as percentage of the gross carrying amount. Expected credit losses are the weighted average of credit losses with the respective risks of a default occurring as the weights. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph IG20D -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_IG20D&doctype=Implementation%20Guidance -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_35N&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 78 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_78_b&doctype=Standard -URIDate 2020-01-01 + Details
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