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Acquisition of Businesses - Additional Information (Detail) |  |  |  |  | 12 Months Ended
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Feb. 14, 2019 | Nov. 13, 2018 | Jul. 25, 2018 | Jul. 01, 2018 USD ($) | Dec. 31, 2018 USD ($)
Regent [member] |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Acquisition of controlling interest |  |  |  | 51.00% |
Date of acquisition |  |  |  | Jul. 01, 2018 |
Name of acquiree |  |  |  | Regent Hospitality Worldwide, Inc ('RHW'), Regent International Hotels Limited and Regent Berlin GmbH. |
Description of acquiree |  |  |  | The acquisition of a 51% controlling interest in an agreement with Formosa International Hotels Corporation (‘FIH’) to acquire the Regent Hotels and Resorts brand and associated management contracts (‘Regent’). |
Description of primary reasons for business combination |  |  |  | On 1 July 2018, the Group completed the acquisition of a 51% controlling interest in an agreement with Formosa International Hotels Corporation (‘FIH’) to acquire the Regent Hotels and Resorts brand and associated management contracts (‘Regent’). The Group acquired 51% of the issued share capital of Regent Hospitality Worldwide, Inc (‘RHW’), 100% of the issued share capital of Regent International Hotels Limited and 100% of the issued share capital of Regent Berlin GmbH. Regent is a leading luxury hotel brand which adds to IHG’s brand portfolio at the top end of the luxury segment. |
Beneficial interest |  |  |  | 49.00% |
Non-controlling interest |  |  |  | $ 0.00 |
Acquisition of controlling interest, description |  |  |  |  | Put and call options exist over the remaining 49% shareholding in RHW which are exercisable in a phased manner from 2026. As the decision-making powers related to the remaining shares are not substantive in driving RHW’s returns and FIH do not share in any costs associated with the future development of the Regent brand, it has been determined that the Group has a present ownership interest in the remaining shares. As such, RHW has been accounted for as 100% owned with no non-controlling interest recognised.
Contributed revenue |  |  |  |  | $ 10,000,000
Operating loss |  |  |  |  | 0
Increase in group revenue |  |  |  |  | $ 9,000,000
Impact of group revenue description |  |  |  |  | If the acquisition had taken place at 1 January 2018, reported Group revenue would have been $9m higher, with no material difference to operating profit
Operating profit (loss) |  |  |  |  | $ 0
Amount of goodwill deductible for tax |  |  |  |  | 0
Contingent liabilities recognised |  |  |  |  | 0
UK Portfolio [member] |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Date of acquisition |  |  | Jul. 25, 2018 |  |
Description of primary reasons for business combination |  |  | On 25 July 2018, the Group completed a deal to operate nine hotels under long-term leases from Covivio (formerly Foncière des Régions), which operated under the Principal and De Vere Hotels brands. An additional leased hotel was added to the portfolio on 13 November 2018, bringing the total to ten (‘UK portfolio’) at 31 December 2018. Two further leased hotels were added on 14 February 2019. The deal establishes IHG as the leading luxury hotel operator in the UK. Over the next one to two years, the hotels will be rebranded to other brands in IHG’s luxury and upscale portfolio. |  |
Contributed revenue |  |  |  |  | 75,000,000
Operating loss |  |  |  |  | 1,000,000
Increase in group revenue |  |  |  |  | $ 90,000,000
Impact of group revenue description |  |  |  |  | If the acquisition had taken place at 1 January 2018, reported Group revenue would have been $90m higher, with no material difference to operating profit
Operating profit (loss) |  |  |  |  | $ 0
Amount of goodwill deductible for tax |  |  |  |  | 0
Contingent liabilities recognised |  |  |  |  | $ 0
Number of hotels operates under long term leases |  | 1 | 9 |  | 10
Gross contractual value of trade receivables |  |  |  |  | $ 5,000,000
Fair value of trade receivables, book value |  |  |  |  | $ 5,000,000
UK Portfolio [member] | Events after reporting period [member] |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Number of hotels operates under long term leases | 2 |  |  |  |

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- Definition The amount of contingent liabilities recognised as of the acquisition date in a business combination. [Refer: Contingent liabilities [member]; Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B64 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_i&doctype=Appendix&seq=2 -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph IE72 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_IE72&doctype=Illustrative%20Examples -URIDate 2018-03-16 + Details
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- Definition The date on which the acquirer obtains control of the acquiree in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B64 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_b&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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- Definition The description of the business or businesses that the acquirer obtains control of in a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B64 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_a&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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- Definition The description of how the acquirer obtained the power to govern the financial and operating policies of the acquiree so as to obtain benefits from its activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B64 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_d&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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- Definition The description of the primary reasons for a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B64 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_d&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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- Definition The fair value of receivables acquired in a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B64 -Subparagraph h -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_h_i&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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- Definition The amount of goodwill in a business combination that is expected to be deductible for tax purposes. [Refer: Goodwill; Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B64 -Subparagraph k -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_k&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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- Definition The gross contractual amounts receivable for receivables acquired in business combinations. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B64 -Subparagraph h -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_h_ii&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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- Definition The name of the business or businesses that the acquirer obtains control of in a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B64 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_a&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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- Definition The amount of non-controlling interest in the acquiree recognised at the acquisition date for business combinations in which the acquirer holds less than 100 per cent of the equity interests in the acquiree at the acquisition date. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B64 -Subparagraph o -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_o_i&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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- Definition The percentage of voting equity interests acquired in a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B64 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_c&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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- Definition The profit (loss) of the acquiree, since the acquisition date, included in the consolidated statement of comprehensive income. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B64 -Subparagraph q -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_q_i&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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- Definition The profit (loss) of the combined entity as though the acquisition date for all business combinations that occurred during the year had been as of the beginning of the annual reporting period. [Refer: Business combinations [member]; Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B64 -Subparagraph q -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_q_ii&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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- Definition The amount of revenue of the acquiree since the acquisition date included in the consolidated statement of comprehensive income. [Refer: Revenue] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B64 -Subparagraph q -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_q_i&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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- Definition The revenue of the combined entity as though the acquisition date for all business combinations that occurred during the year had been as of the beginning of the annual reporting period. [Refer: Business combinations [member]; Revenue] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B64 -Subparagraph q -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_q_ii&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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- Definition impact of group revenue description. + References No definition available. + Details
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- Definition Number of hotels. + References No definition available. + Details
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