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Trade receivables - Trade receivables from closely monitored countries (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of geographical areas [line items] |  |  |  |
Gross trade receivables | $ 1,429 | $ 1,438 |  |
Provisions for doubtful trade receivables | (68) | (48) | $ (54) | $ (77)
Greece, Italy, Portugal, Spain, Brazil, Russia, Turkey, Saudi Arabia, and Argentina [member] |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Provisions for doubtful trade receivables | (15) | (13) |  |
Not overdue [member] |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Gross trade receivables | 1,137 | 1,135 |  |
Provisions for doubtful trade receivables | (2) | (1) |  |
Not overdue [member] | Greece, Italy, Portugal, Spain, Brazil, Russia, Turkey, Saudi Arabia, and Argentina [member] |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Gross trade receivables | 211 | 209 |  |
Past due for more than one year [member] |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Gross trade receivables | 49 | 36 |  |
Provisions for doubtful trade receivables | (43) | (31) |  |
Past due for more than one year [member] | Greece, Italy, Portugal, Spain, Brazil, Russia, Turkey, Saudi Arabia, and Argentina [member] |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Gross trade receivables | $ 14 | $ 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 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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- Details
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- Details
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- Details
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