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Trade and Other Receivables - Summary of Ageing of Trade and Other Receivables (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Disclosure of trade and other receivables [line items] |  |  |  |
Gross | $ 513 | $ 554 |  |
Credit loss allowance | (11) | (77) | $ (69) | $ (56)
Net | 502 | 477 |  |
Not past due [member] |  |  |  |
Disclosure of trade and other receivables [line items] |  |  |  |
Gross | 356 | 333 |  |
Credit loss allowance | (1) | (1) |  |
Net | 355 | 332 |  |
Past due 1 to 30 days [member] |  |  |  |
Disclosure of trade and other receivables [line items] |  |  |  |
Gross | 71 | 68 |  |
Credit loss allowance | (1) | (2) |  |
Net | 70 | 66 |  |
Past due 31 to 180 days [member] |  |  |  |
Disclosure of trade and other receivables [line items] |  |  |  |
Gross | 86 | 82 |  |
Credit loss allowance | (9) | (7) |  |
Net | 77 | 75 |  |
Past due more than 180 days [member] |  |  |  |
Disclosure of trade and other receivables [line items] |  |  |  |
Gross | 0 | 71 |  |
Credit loss allowance | 0 | (67) |  |
Net | $ 0 | $ 4 |  |

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- Definition The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_16&doctype=Standard&book=b -URIDate 2018-03-16 + Details
Name: | ifrs-full_AllowanceAccountForCreditLossesOfFinancialAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition Gross trade and other receivables. + References No definition available. + Details
Name: | ihg_GrossTradeAndOtherReceivables
Namespace Prefix: | ihg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Details
Name: | ifrs-full_PastDueStatusAxis=ifrs-full_CurrentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_PastDueStatusAxis=ifrs-full_NotLaterThanOneMonthMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_PastDueStatusAxis=ifrs-full_LaterThanOneMonthAndNotLaterThanSixMonthsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_PastDueStatusAxis=ifrs-full_LaterThanSixMonthsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |