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Accounting policies - Summary of Estimated Impact of IFRS 15 (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of initial application of standards or interpretations [line items] |  |  |
Group revenue | $ 1,784 | $ 1,715 | $ 1,803
Gross operating profit | 763 | 678 | $ 1,499
Group net liabilities | (851) | $ (759) |
Increase (decrease) due to application of IFRS 15 [member] |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |
Group revenue | 1,074 |  |
Gross operating profit | (1) |  |
Group net liabilities | (259) |  |
Increase (decrease) due to application of IFRS 15 [member] | Employee cost reimbursements [member] |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |
Group revenue | 1,103 |  |
Increase (decrease) due to application of IFRS 15 [member] | Initial franchise and re-licensing fees [member] |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |
Group revenue | (14) |  |
Gross operating profit | (14) |  |
Group net liabilities | (111) |  |
Increase (decrease) due to application of IFRS 15 [member] | Contract acquisition costs [member] |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |
Gross operating profit | 5 |  |
Group net liabilities | 43 |  |
Increase (decrease) due to application of IFRS 15 [member] | Key money [member] |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |
Group revenue | (17) |  |
Increase (decrease) due to application of IFRS 15 [member] | Derecognition of management contracts [member] |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |
Gross operating profit | 8 |  |
Group net liabilities | (192) |  |
Increase (decrease) due to application of IFRS 15 [member] | Other [member] |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |
Group revenue | 2 |  |
Group net liabilities | $ 1 |  |

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