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General Information - Additional Information (Detail) $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 01, 2018 USD ($) | Dec. 31, 2018 USD ($) Lease | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jan. 01, 2016 USD ($) | Dec. 31, 2015 USD ($)
Accounting policies [line items] |  |  |  |  |  |
Fair value of trust assets |  | $ 193 | $ 197 |  |  |
Depreciation method, property, plant and equipment |  | All depreciation is charged on a straight-line basis. |  |  |  |
Deferred revenue |  | $ 1,506 | 1,357 |  |  |
Goodwill and other intangible assets |  | 1,143 | 967 | $ 858 |  |
Net book value, property, plant and equipment |  | 447 | 425 | 419 |  |
Net book value, other intangible assets |  | 580 | 537 |  |  |
Net book value, investments in associates and joint ventures |  | $ 104 | 141 | 111 |  |
Description of sensitivity analysis in respect of those other assets requiring an impairment test |  | In respect of those 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 an impairment charge of $10m. |  |  |  |
Reimbursed costs |  | $ 1,171 | 1,103 | 1,046 |  |
Revenue from fee business |  | 1,486 | 1,379 | 1,329 |  |
Deferred revenue current |  |  | 490 |  |  |
Deferred revenue noncurrent |  |  | 867 |  |  |
Operating profit |  | 566 | 728 | 712 |  |
Capitalisation of contract costs |  | 60 | 58 | 53 |  |
Contract assets current |  | 20 | 17 | 13 |  |
Contract assets noncurrent |  | 270 | 241 | 185 |  |
Depreciation and amortisation |  | 80 | 78 | 75 |  |
Revenue |  | 4,337 | 4,075 | 3,912 |  |
Contract assets |  | 290 | 258 | 198 |  |
Deferred tax assets |  | 60 | 75 | 69 |  |
Total liabilities |  | 4,830 | 4,311 | 3,908 |  |
Interest expense on borrowings |  | 66 | 62 | 71 |  |
System Fund revenues |  | 1,233 | 1,242 | 1,199 |  |
System Fund expenses |  | 1,379 | 1,276 | 1,164 |  |
Equity |  | (1,077) | (1,301) | (1,146) | $ (118) | $ (118)
Finance lease |  | 235 | 231 |  |  |
Brands [member] |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |
Goodwill and other intangible assets |  | 250 | 193 | 193 |  |
InterContinental Boston [member] |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |
Finance lease |  | 235 |  |  |  |
IHG Rewards club loyalty programme [member] |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |
Interest expense on borrowings |  | 14 | 7 | 3 |  |
Loyalty programme liability [member] |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |
Redemption liability description |  | 14 |  |  |  |
System Fund [member] | Loyalty programme liability [member] |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |
Deferred revenue |  | 1,181 | 1,057 |  |  |
Associates [member] |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |
Net book value, investments in associates and joint ventures |  | 104 | 114 | 85 |  |
Fixtures, fittings and equipment [member] |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |
Net book value, property, plant and equipment |  | 146 | 123 | 119 |  |
Goodwill [member] |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |
Goodwill and other intangible assets |  | 313 | 237 |  |  |
Other assets requiring an impairment test [member] |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |
Sensitivity analysis |  | 0 |  |  |  |
Exceptional items [member] |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |
Operating profit |  | (104) | 4 | (29) |  |
Exceptional items [member] | Associates [member] |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |
Impairment charges |  | 0 | 18 | 16 |  |
Retained earnings [member] |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |
Equity |  | 1,166 | 969 | 990 |  | 2,209
Reclassification adjustment in equity | $ 18 |  |  |  |  |
Increase (decrease) due to application of IFRS 15 [member] |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |
Goodwill and other intangible assets |  |  | (500) |  |  |
Reimbursed costs |  |  | 1,103 |  |  |
Deferred revenue current |  |  | 490 |  |  |
Deferred revenue noncurrent |  |  | 867 |  |  |
Contract assets current |  |  | 17 |  |  |
Contract assets noncurrent |  |  | 241 |  |  |
Deferred tax assets |  |  | 19 |  |  |
Total liabilities |  |  | 285 |  |  |
System Fund revenues |  |  | 1,217 |  |  |
System Fund expenses |  |  | 1,251 |  |  |
Equity |  |  | (450) |  |  |
Increase (decrease) due to application of IFRS 15 [member] | Loyalty programme liability [member] |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |
Deferred revenue |  |  | 1,057 |  |  |
Increase (decrease) due to application of IFRS 15 [member] | System Fund [member] |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |
Operating profit |  |  | (34) |  |  |
Revenue |  |  | 1,217 |  |  |
System Fund revenues |  |  | 1,217 |  |  |
System Fund expenses |  |  | 1,251 |  |  |
Increase (decrease) due to application of IFRS 15 [member] | Disposals subject to management contract [member] |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |
Deferred tax liabilities |  |  | 32 |  |  |
Intangible assets |  |  | (243) |  |  |
Amortisation charge |  |  | 8 |  |  |
Deferred tax assets |  |  | 19 |  |  |
Increase (decrease) due to application of IFRS 15 [member] | Key money payment [member] |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |
Contract assets current |  |  | 17 |  |  |
Contract assets noncurrent |  |  | 240 |  |  |
Depreciation and amortisation |  |  | (17) |  |  |
Revenue |  |  | (17) |  |  |
Contract assets |  |  | 257 |  |  |
Intangible assets |  |  | (257) |  |  |
Increase (decrease) due to application of IFRS 15 [member] | Initial application & re-licensing fees [member] |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |
Deferred revenue |  |  | 163 |  |  |
Revenue from fee business |  |  | (14) |  |  |
Deferred revenue current |  |  | 24 |  |  |
Deferred revenue noncurrent |  |  | 139 |  |  |
Deferred tax liabilities |  |  | 40 |  |  |
Increase (decrease) due to application of IFRS 15 [member] | Contract costs [member] |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |
Deferred tax liabilities |  |  | (15) |  |  |
Operating profit |  |  | 5 |  |  |
Capitalisation of contract costs |  |  | 58 |  |  |
Contract assets current |  |  | 7 |  |  |
Contract assets noncurrent |  |  | 51 |  |  |
Previously reported [member] |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |
Goodwill and other intangible assets |  |  | 1,467 |  |  |
Revenue from fee business |  |  | 1,600 |  |  |
Operating profit |  |  | 763 |  |  |
Depreciation and amortisation |  |  | 103 |  |  |
Revenue |  |  | 1,784 |  |  |
Deferred tax assets |  |  | 56 |  |  |
Redemption cost liability |  |  | 760 |  |  |
Total liabilities |  |  | 4,026 |  |  |
Equity |  |  | (1,301) | (1,146) | $ 319 | 319
Previously reported [member] | IHG Rewards club loyalty programme [member] |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |
Interest expense on borrowings |  |  | 7 |  |  |
Previously reported [member] | System Fund [member] |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |
Capitalisation of interest benefit |  |  | 6 |  |  |
Previously reported [member] | System Fund [member] | System fund surplus [member] |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |
Total liabilities |  |  | 158 |  |  |
Previously reported [member] | Retained earnings [member] |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |
Equity |  |  | $ 951 | $ 990 |  | $ 2,653
IFRS 16 [member] |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |
Depreciation and amortisation |  | (34) |  |  |  |
Deferred tax assets |  | $ 3 |  |  |  |
Percentage of lease liability |  | 90.00% |  |  |  |
Number of leases | Lease |  | 9 |  |  |  |
IFRS 16 [member] | Hotel [member] |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |
Percentage of lease liability |  | 62.00% |  |  |  |
IFRS 16 [member] | Office building [member] |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |
Percentage of lease liability |  | 28.00% |  |  |  |
Management contracts [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 |  |  |  |
Goodwill and other intangible assets |  | $ 273 |  |  |  |
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] | Software [member] |  |  |  |  |  |
Accounting policies [line items] |  |  |  |  |  |
Estimated useful lives |  | 5 years |  |  |  |
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 |  | 3 years |  |  |  |

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