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Accounting policies - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accounting policies [line items] |  |  |
Fair value of trust assets | $ 197 | $ 161 |
Depreciation method, property, plant and equipment | All depreciation is charged on a straight-line basis. |  |
Liabilities | $ 4,026 | 3,686 |
Goodwill and other intangible assets | 1,467 | 1,292 | $ 1,226
Net book value, property, plant and equipment | 425 | 419 | 428
Net book value, other intangible assets | 1,037 | 867 |
Net book value, investments in associates and joint ventures | $ 141 | 111 | 136
Description of sensitivity analysis in respect of those other assets requiring an impairment test | In respect of those other assets requiring an impairment test and depending on how recoverable amount was assessed, a 10% reduction in fair value or estimated future cash flows would have resulted in a further impairment charge of $13m. |  |
IFRS 15 revenue from contracts with customers [member] |  |  |
Accounting policies [line items] |  |  |
Increase (decrease) in revenue due to application of IFRS 15 | $ 1,200 |  |
Loyalty programme liability [member] |  |  |
Accounting policies [line items] |  |  |
Redemption liability description | 10 |  |
System fund surplus [member] |  |  |
Accounting policies [line items] |  |  |
Liabilities | 158 |  |
System fund [member] |  |  |
Accounting policies [line items] |  |  |
Liabilities | 918 | 912 | 835
System fund [member] | Loyalty programme liability [member] |  |  |
Accounting policies [line items] |  |  |
Liabilities | 760 | 685 | 649
System fund [member] | System fund surplus [member] |  |  |
Accounting policies [line items] |  |  |
Liabilities | 158 | 227 | 186
Associates [member] |  |  |
Accounting policies [line items] |  |  |
Net book value, investments in associates and joint ventures | 114 | 85 | 109
Fixtures, fittings and equipment [member] |  |  |
Accounting policies [line items] |  |  |
Net book value, property, plant and equipment | 123 | 119 | 125
Goodwill [member] |  |  |
Accounting policies [line items] |  |  |
Goodwill and other intangible assets | 237 | 232 |
Brands [member] |  |  |
Accounting policies [line items] |  |  |
Goodwill and other intangible assets | 193 | 193 |
Other Assets Requiring an Impairment Test [member] |  |  |
Accounting policies [line items] |  |  |
Sensitivity analysis | 13 |  |
Exceptional items [member] |  |  |
Accounting policies [line items] |  |  |
Gain on disposal of available-for-sale equity investment | 73 |  |
Exceptional items [member] | Associates [member] |  |  |
Accounting policies [line items] |  |  |
Impairment charges | $ 18 | $ 16 | $ 9
Management contracts [member] |  |  |
Accounting policies [line items] |  |  |
Amortisation method, intangible assets other than goodwill | Straight-line |  |
Other intangibles [member] |  |  |
Accounting policies [line items] |  |  |
Amortisation method, intangible assets other than goodwill | Straight-line |  |
Software [member] |  |  |
Accounting policies [line items] |  |  |
Amortisation method, intangible assets other than goodwill | Straight-line |  |
Maximum [member] | IFRS 16 Leases [member] |  |  |
Accounting policies [line items] |  |  |
Increase in lease liabilities | $ 400 |  |
Maximum [member] | Buildings [member] |  |  |
Accounting policies [line items] |  |  |
Estimated useful lives | 50 years |  |
Maximum [member] | Fixtures, fittings and equipment [member] |  |  |
Accounting policies [line items] |  |  |
Estimated useful lives | 25 years |  |
Maximum [member] | Management contracts [member] |  |  |
Accounting policies [line items] |  |  |
Estimated useful lives | 50 years |  |
Maximum [member] | Other intangibles [member] |  |  |
Accounting policies [line items] |  |  |
Estimated useful lives | 50 years |  |
Maximum [member] | Software [member] |  |  |
Accounting policies [line items] |  |  |
Estimated useful lives | Five years |  |
Minimum [member] | IFRS 16 Leases [member] |  |  |
Accounting policies [line items] |  |  |
Increase in lease liabilities | $ 350 |  |
Minimum [member] | Fixtures, fittings and equipment [member] |  |  |
Accounting policies [line items] |  |  |
Estimated useful lives | 3 years |  |
Minimum [member] | Software [member] |  |  |
Accounting policies [line items] |  |  |
Estimated useful lives | Three years |  |

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