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Goodwill and other intangible assets - Summary of Goodwill and Other Intangible Assets (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |
Beginning balance | $ 1,292 | $ 1,226
Ending balance | 1,467 | 1,292
Cost [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |
Beginning balance | 1,886 | 1,790
Additions | 241 | 180
Capitalised interest | 6 | 4
Disposals | (17) | (52)
Exchange and other adjustments | 41 | (36)
Ending balance | 2,157 | 1,886
Amortisation and impairment [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |
Beginning balance | (594) | (564)
Provided | (68) | (66)
System Fund expense | (30) | (26)
Disposals | 16 | 48
Exchange and other adjustments | (14) | 14
Ending balance | (690) | (594)
Goodwill [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |
Beginning balance | 232 | 233
Ending balance | 237 | 232
Goodwill [member] | Cost [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |
Beginning balance | 370 | 371
Exchange and other adjustments | 7 | (1)
Ending balance | 377 | 370
Goodwill [member] | Amortisation and impairment [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |
Beginning balance | (138) | (138)
Exchange and other adjustments | (2) |
Ending balance | (140) | (138)
Brands [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |
Beginning balance | 193 | 193
Ending balance | 193 | 193
Brands [member] | Cost [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |
Beginning balance | 193 | 193
Ending balance | 193 | 193
Software [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |
Beginning balance | 360 | 296
Ending balance | 464 | 360
Software [member] | Cost [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |
Beginning balance | 583 | 498
Additions | 168 | 127
Capitalised interest | 6 | 4
Disposals | (14) | (45)
Exchange and other adjustments | 2 | (1)
Ending balance | 745 | 583
Software [member] | Amortisation and impairment [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |
Beginning balance | (223) | (202)
Provided | (40) | (41)
System Fund expense | (30) | (26)
Disposals | 14 | 45
Exchange and other adjustments | (2) | 1
Ending balance | (281) | (223)
Management contracts [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |
Beginning balance | 303 | 326
Ending balance | 307 | 303
Management contracts [member] | Cost [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |
Beginning balance | 444 | 465
Exchange and other adjustments | 22 | (21)
Ending balance | 466 | 444
Management contracts [member] | Amortisation and impairment [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |
Beginning balance | (141) | (139)
Provided | (10) | (11)
Exchange and other adjustments | (8) | 9
Ending balance | (159) | (141)
Other intangibles [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |
Beginning balance | 204 | 178
Ending balance | 266 | 204
Other intangibles [member] | Cost [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |
Beginning balance | 296 | 263
Additions | 73 | 53
Disposals | (3) | (7)
Exchange and other adjustments | 10 | (13)
Ending balance | 376 | 296
Other intangibles [member] | Amortisation and impairment [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |
Beginning balance | (92) | (85)
Provided | (18) | (14)
Disposals | 2 | 3
Exchange and other adjustments | (2) | 4
Ending balance | $ (110) | $ (92)

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