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Property, plant and equipment - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) Hotel | Dec. 31, 2016 USD ($) Hotel | Dec. 31, 2015 USD ($)
Disclosure of detailed information about property, plant and equipment [abstract] |  |  |
Percentage of net book value of property, plant and equipment relating to largest owned and leased hotel | 43.00% | 44.00% |
Number of hotels owned and leased | Hotel | 8 | 8 |
Number of opened hotel | Hotel | 8 | 8 |
Number of hotels under construction | Hotel | 0 | 0 |
Carrying value of property, plant and equipment held under finance leases | $ | $ 181 | $ 182 |
Percentage of hotel properties directly owned | 26.00% | 25.00% |
Percentage of hotel properties held under leases for 50 years or longer | 57.00% | 58.00% |
Impairment charge | $ |  |  | $ 27
Recoverable amount of impaired assets | $ |  |  | $ 37
Estimated future cash flows pre-tax discount rate |  |  | 11.75%

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- Definition The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_v&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 98 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_98_a&doctype=Standard -URIDate 2017-03-09 + Details
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