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Trade and other receivables - Summary of trade and other receivables (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Trade And Other Receivables [Line Items] |  |
Net of provisions for doubtful debts | $ 8 |
Increase in provision | 2 |
Provision utilised | $ 42 |
IAS 39 [member] |  |
Trade And Other Receivables [Line Items] |  |
Net of provisions for doubtful debts |  | $ 55
IFRS 9 [member] |  |
Trade And Other Receivables [Line Items] |  |
Net of provisions for doubtful debts |  | $ 7

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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 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_16&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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- Definition The decrease in an allowance account for credit losses of financial assets resulting from the utilisation of the allowance. [Refer: Allowance account for credit losses of financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_16&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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- Definition Increase in expected credit loss relating to receivables. + References No definition available. + Details
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- Definition Trade and other receivables. + References No definition available. + Details
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- Details
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- Details
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Period Type: |