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General Information - Impact of IFRS 15 on Group Statement of Financial Position (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2016 | Dec. 31, 2015
--- | --- | --- | --- | --- | ---
Disclosure of impact of initial application of new accounting standards [line item] |  |  |  |  |
Deferred tax liabilities | $ (131) | $ (101) | $ (170) |  |
Deferred tax liability assets | (71) | (26) | (101) |  |
Goodwill and other intangible assets | 1,143 | 967 | 858 |  |
Deferred tax assets | 60 | 75 | 69 |  |
Contract costs | 55 | 51 | 45 |  |
Contract assets | 270 | 241 | 185 |  |
Other non-current assets |  | 813 |  |  |
Total non-current assets | 2,377 | 2,147 | 1,966 |  |
Contract costs | 5 | 7 | 8 |  |
Contract assets | 20 | 17 | 13 |  |
Other current assets |  | 839 |  |  |
Total current assets | 1,376 | 863 | 796 |  |
Total assets | 3,753 | 3,010 | 2,762 |  |
Trade and other payables | (618) | (597) | (526) |  |
Deferred revenue |  | (490) |  |  |
Other current liabilities |  | (193) |  |  |
Total current liabilities | (1,370) | (1,280) | (1,150) |  |
Trade and other payables | (158) | (36) | (29) |  |
Deferred revenue |  | (867) |  |  |
Other non-current liabilities |  | (2,027) |  |  |
Total non-current liabilities | (3,460) | (3,031) | (2,758) |  |
Total liabilities | (4,830) | (4,311) | (3,908) |  |
Net liabilities | (1,077) | (1,301) | (1,146) |  |
Equity share capital | 146 | 154 | 141 |  |
Capital redemption reserve | 10 | 10 | 9 |  |
Shares held by employee share trusts | (4) | (5) | (11) |  |
Other reserves | (2,865) | (2,874) | (2,860) |  |
Fair value reserve |  | 79 |  |  |
Currency translation reserve | 419 | 377 | 466 |  |
Retained earnings | 1,166 | 951 | 990 |  |
IHG shareholders' equity | (1,085) | (1,308) | (1,154) |  |
Non-controlling interest | 8 | 7 | 8 |  |
Total equity | $ (1,077) | (1,301) | (1,146) | $ (118) | $ (118)
Previously reported [member] |  |  |  |  |
Disclosure of impact of initial application of new accounting standards [line item] |  |  |  |  |
Deferred tax liabilities |  | (157) |  |  |
Goodwill and other intangible assets |  | 1,467 |  |  |
Deferred tax assets |  | 56 |  |  |
Other non-current assets |  | 813 |  |  |
Total non-current assets |  | 2,336 |  |  |
Other current assets |  | 839 |  |  |
Total current assets |  | 839 |  |  |
Total assets |  | 3,175 |  |  |
Loyalty programme liability |  | (343) |  |  |
Trade and other payables |  | (768) |  |  |
Other current liabilities |  | (193) |  |  |
Total current liabilities |  | (1,304) |  |  |
Loyalty programme liability |  | (417) |  |  |
Trade and other payables |  | (121) |  |  |
Other non-current liabilities |  | (2,027) |  |  |
Total non-current liabilities |  | (2,722) |  |  |
Total liabilities |  | (4,026) |  |  |
Net liabilities |  | (851) |  |  |
Equity share capital |  | 154 |  |  |
Capital redemption reserve |  | 10 |  |  |
Shares held by employee share trusts |  | (5) |  |  |
Other reserves |  | (2,874) |  |  |
Fair value reserve |  | 79 |  |  |
Currency translation reserve |  | 373 |  |  |
Retained earnings |  | 1,405 |  |  |
IHG shareholders' equity |  | (858) |  |  |
Non-controlling interest |  | 7 |  |  |
Total equity |  | (1,301) | $ (1,146) | $ 319 | $ 319
Increase (decrease) due to application of IFRS 15 [member] |  |  |  |  |
Disclosure of impact of initial application of new accounting standards [line item] |  |  |  |  |
Deferred tax liability assets |  | 56 |  |  |
Goodwill and other intangible assets |  | (500) |  |  |
Deferred tax assets |  | 19 |  |  |
Contract costs |  | 51 |  |  |
Contract assets |  | 241 |  |  |
Total non-current assets |  | (189) |  |  |
Contract costs |  | 7 |  |  |
Contract assets |  | 17 |  |  |
Total current assets |  | 24 |  |  |
Total assets |  | (165) |  |  |
Loyalty programme liability |  | 343 |  |  |
Trade and other payables |  | 171 |  |  |
Deferred revenue |  | (490) |  |  |
Total current liabilities |  | 24 |  |  |
Loyalty programme liability |  | 417 |  |  |
Trade and other payables |  | 85 |  |  |
Deferred revenue |  | (867) |  |  |
Total non-current liabilities |  | (309) |  |  |
Total liabilities |  | (285) |  |  |
Net liabilities |  | (450) |  |  |
Currency translation reserve |  | 4 |  |  |
Retained earnings |  | (454) |  |  |
IHG shareholders' equity |  | (450) |  |  |
Total equity |  | $ (450) |  |  |

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