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Trade receivables (Details 3) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Analysis of overdue amounts [line items] |  |
Total trade receivables, net | $ 8,217 | $ 8,301
Trade receivables [member] |  |
Analysis of overdue amounts [line items] |  |
Total trade receivables, net | 8,217 | 8,301
Trade receivables [member] | Current [member] |  |
Analysis of overdue amounts [line items] |  |
Total trade receivables, net | 7,714 | 7,763
Trade receivables [member] | Not later than one month [member] |  |
Analysis of overdue amounts [line items] |  |
Total trade receivables, net | 150 | 161
Trade receivables [member] | Later than one month and not later than three months [member] |  |
Analysis of overdue amounts [line items] |  |
Total trade receivables, net | 118 | 123
Trade receivables [member] | Later than three months and not later than six months [member] |  |
Analysis of overdue amounts [line items] |  |
Total trade receivables, net | 102 | 103
Trade receivables [member] | Later than six months and not later than one year [member] |  |
Analysis of overdue amounts [line items] |  |
Total trade receivables, net | 77 | 96
Trade receivables [member] | Later than one year [member] |  |
Analysis of overdue amounts [line items] |  |
Total trade receivables, net | $ 149 | $ 150

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- Definition The amount of current trade receivables. [Refer: Trade receivables] + 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 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 68 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_68&doctype=Standard -URIDate 2019-03-27 + Details
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