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Trade and other receivables - Summary of Trade and Other Receivables (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Current |  |  |  |
Trade receivables | [1] | $ 309 | $ 515 |
Other receivables |  | 129 | 37 |
Prepayments |  | 76 | 114 |
Total |  | $ 514 | $ 666 | $ 610
[1] | Including cost reimbursements of $26m (2019: $67m).

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- Definition The amount receivable by the entity that it does not separately disclose in the same statement or note. + 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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