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Investment in associates and joint ventures - Summary of Investments in Associates and Joint ventures (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of associates and joint ventures [line items] |  |  |
Beginning balance | $ 111 | $ 136 |
Share of (losses)/profits | (3) | 2 | $ 3
Ending balance | 141 | 111 | 136
Cost [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Beginning balance | 139 | 148 |
Additions | 47 | 14 |
Share of (losses)/profits | 3 | (2) |
Capital return |  | (2) |
Transfer of financial assets |  | (14) |
Disposals | (9) |  |
Dividends | (4) | (5) |
Exchange and other adjustments | 2 |  |
Ending balance | 178 | 139 | 148
Accumulated impairment [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Beginning balance | (28) | (12) |
Charge for the year | (18) | (16) |
Disposals | 9 |  |
Ending balance | (37) | (28) | (12)
Joint ventures [Member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Beginning balance | 26 | 27 |
Ending balance | 27 | 26 | 27
Joint ventures [Member] | Cost [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Beginning balance | 26 | 27 |
Share of (losses)/profits | 1 | 1 |
Capital return |  | (2) |
Ending balance | 27 | 26 | 27
Associates [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Beginning balance | 85 | 109 |
Ending balance | 114 | 85 | 109
Associates [member] | Cost [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Beginning balance | 113 | 121 |
Additions | 47 | 14 |
Share of (losses)/profits | 2 | (3) |
Transfer of financial assets |  | (14) |
Disposals | (9) |  |
Dividends | (4) | (5) |
Exchange and other adjustments | 2 |  |
Ending balance | 151 | 113 | 121
Associates [member] | Accumulated impairment [member] |  |  |
Disclosure of associates and joint ventures [line items] |  |  |
Beginning balance | (28) | (12) |
Charge for the year | (18) | (16) |
Disposals | 9 |  |
Ending balance | $ (37) | $ (28) | $ (12)

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- Definition The amount recognised as a reduction of the carrying amount of an asset or cash-generating unit to its recoverable amount. [Refer: Carrying amount [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 130 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_130_b&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 130 -Subparagraph d -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_130_d_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of investments in subsidiaries, joint ventures and associates in an entity's separate financial statements. [Refer: Associates [member]; Joint ventures [member]; Subsidiaries [member]; Investments in subsidiaries] + 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 The entity's share of the profit (loss) of associates and joint ventures accounted for using the equity method. [Refer: Associates [member]; Investments accounted for using equity method; Joint ventures [member]; Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2017-01-01 -Paragraph 23 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2017-03-01&anchor=para_23_g&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2017-01-01 -Paragraph 28 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2017-03-01&anchor=para_28_e&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 82 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_82_c&doctype=Standard -URIDate 2017-03-09 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Note Effective on first application of IFRS 9 -Name IFRS -Number 4 -IssueDate 2017-01-01 -Paragraph 39M -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=4&date=2017-03-01&anchor=para_39M_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Additions to associates and joint ventures. + References No definition available. + Details
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- Definition Associates and joint ventures capital return. + References No definition available. + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information about associate and joint ventures associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition Disposals in associates and joint ventures. + References No definition available. + Details
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