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Financial risk management and derivatives - Disclosure of Short-term Deposits by Counterparty Credit Rating (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of credit risk exposure [line items] |  |
Short term deposits | $ 234 | $ 4
AAA credit rating [member] |  |
Disclosure of credit risk exposure [line items] |  |
Short term deposits | 76 |
AA Minus Credit Rating [member] |  |
Disclosure of credit risk exposure [line items] |  |
Short term deposits | 70 |
A credit rating [member] |  |
Disclosure of credit risk exposure [line items] |  |
Short term deposits | $ 88 |

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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 A classification of cash equivalents representing short-term deposits. [Refer: Cash equivalents] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_45&doctype=Standard -URIDate 2018-03-16 + Details
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- Details
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- Details
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Period Type: |

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- Details
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Period Type: |