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Trade and other receivables - Summary of Ageing of Trade and Other Receivables (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Financial assets at end of period |  |  |  |
Gross | $ 387 | $ 533 |  |
Credit loss allowance | (78) | (18) | $ (11) | $ (77)
Net | 309 | 515 |  |
Not past due [member] |  |  |  |
Financial assets at end of period |  |  |  |
Gross | 153 | 363 |  |
Credit loss allowance | (1) | (3) |  |
Net | 152 | 360 |  |
Past due 1 to 30 days [member] |  |  |  |
Financial assets at end of period |  |  |  |
Gross | 59 | 74 |  |
Credit loss allowance | (2) | (3) |  |
Net | 57 | 71 |  |
Past due 31 to 90 days [member] |  |  |  |
Financial assets at end of period |  |  |  |
Gross | 61 | 56 |  |
Credit loss allowance | (6) | (5) |  |
Net | 55 | 51 |  |
Past due more than 90 days [member] |  |  |  |
Financial assets at end of period |  |  |  |
Gross | 40 | 35 |  |
Credit loss allowance | (7) | (7) |  |
Net | 33 | 28 |  |
Past due more than 180 days [member] |  |  |  |
Financial assets at end of period |  |  |  |
Gross | 74 | 5 |  |
Credit loss allowance | (62) |  |  |
Net | $ 12 | $ 5 |  |

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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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- Definition Gross trade and other receivables. + References No definition available. + Details
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- Definition Trade and other receivables excluding prepayments. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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