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Financial risk management - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Currency risk [member] |  |
Disclosure of financial risk management [line items] |  |
Foreign exchange derivatives | $ 30 | $ 120
Fair value of derivative financial instruments | 0 | (3)
Liquidity risk [member] |  |
Disclosure of financial risk management [line items] |  |
Funds held in foreign countries | $ 3 | $ 3
Number of financial covenants | Two |
Capital risk management [member] |  |
Disclosure of financial risk management [line items] |  |
Amounts managed as capital | 993 | 739
Fixed interest rate [member] | Interest rate risk [member] |  |
Disclosure of financial risk management [line items] |  |
Fixed Interest rate borrowings | 86.00% | 93.00%
US dollars [member] | Net investment hedges [member] |  |
Disclosure of financial risk management [line items] |  |
Foreign exchange derivatives | $ 160 | $ 325

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- Definition The fair value of financial instruments designated as hedging instruments. Hedging instruments are designated derivatives or (for a hedge of the risk of changes in foreign currency exchange rates only) designated non-derivative financial assets or non-derivative financial liabilities whose fair value or cash flows are expected to offset changes in the fair value or cash flows of a designated hedged item. [Refer: At fair value [member]; Derivatives [member]; Derivative financial assets; Derivative financial liabilities; Financial instruments, class [member]; Financial assets; Financial liabilities] + 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 22 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_22_b&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of cash and cash equivalents whose use or withdrawal is restricted. [Refer: Cash and cash equivalents] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Summary quantitative data about what the entity manages as capital. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 135 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_135_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Line items represents information about financial risk management. + References No definition available. + Details
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- Definition Financial covenants description. + References No definition available. + Details
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- Definition Percentage of fixed rate borrowings. + 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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