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Trade and other receivables - Summary of Maximum Exposure to Credit Risk for Trade and Other Receivables Excluding Prepayments by Geographic Region (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of trade and other receivables [line items] |  |
Maximum exposure to credit risk | $ 477 | $ 403
Americas [member] |  |
Disclosure of trade and other receivables [line items] |  |
Maximum exposure to credit risk | 305 | 256
Europe [member] |  |
Disclosure of trade and other receivables [line items] |  |
Maximum exposure to credit risk | 51 | 43
AMEA [member] |  |
Disclosure of trade and other receivables [line items] |  |
Maximum exposure to credit risk | 71 | 61
China [member] |  |
Disclosure of trade and other receivables [line items] |  |
Maximum exposure to credit risk | $ 50 | $ 43

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- Definition Disclosure of trade and other receivables. + References No definition available. + Details
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Namespace Prefix: | ihg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Trade and other receivables excluding prepayments. + References No definition available. + Details
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Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_GeographicalAreasAxis=us-gaap_EuropeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |