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Provisions - Summary of Provisions (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of other provisions [Line Items] |  |
Other provisions, beginning balance | $ 8 | $ 8
Reclassification from other trade and other payables | 25 | 0
(Released)/provided | 4 | 0
Utilised | (10) | 0
Other provisions, ending balance | 27 | 8
Security Incidents [member] |  |
Disclosure of other provisions [Line Items] |  |
Other provisions, beginning balance | 5 | 5
Reclassification from other trade and other payables |  | 0
(Released)/provided | (2) | 0
Utilised | (3) | 0
Other provisions, ending balance | 0 | 5
Litigation [member] |  |
Disclosure of other provisions [Line Items] |  |
Other provisions, beginning balance | 3 | 3
Reclassification from other trade and other payables |  | 0
(Released)/provided | (1) | 0
Utilised |  | 0
Other provisions, ending balance | 2 | $ 3
Insurance Provision [member] |  |
Disclosure of other provisions [Line Items] |  |
Reclassification from other trade and other payables | 25 |
(Released)/provided | 7 |
Utilised | (7) |
Other provisions, ending balance | $ 25 |

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- Definition The amount of additional other provisions made. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2018-01-01 -Paragraph 84 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2018-03-01&anchor=para_84_b&doctype=Standard -URIDate 2018-03-16 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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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Balance Type: | na
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- Definition The increase (decrease) in other provisions resulting from transfers and changes that the entity does not separately disclose in the same statement or note. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2018-01-01 -Paragraph 84 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2018-03-01&anchor=para_84&doctype=Standard -URIDate 2018-03-16 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of provisions other than provisions for employee benefits. [Refer: Provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2018-01-01 -Paragraph 84 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2018-03-01&anchor=para_84_a&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 78 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_78_d&doctype=Standard -URIDate 2018-03-16 + Details
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Period Type: | instant

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- Definition The amount used (ie incurrent and charged against the provision) for other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2018-01-01 -Paragraph 84 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2018-03-01&anchor=para_84_c&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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Balance Type: |
Period Type: |