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Goodwill and Other Intangible Assets - Summary of Carrying Value of Goodwill and Indefinite Life Brands were Allocated to CGUs for Year-end Impairment Testing (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of information for cash-generating units [Line Items] |  |
Additions |  | $ 263
Exchange differences | $ 7 | 1
Impairment charges goodwill |  | (49)
Cash-generating units [member] |  |
Disclosure of information for cash-generating units [Line Items] |  |
Goodwill | 778 | 563
Goodwill | 785 | 778
Americas Managed [member] |  |
Disclosure of information for cash-generating units [Line Items] |  |
Additions |  | 112
Reallocation | (384) |
Americas Managed [member] | Cash-generating units [member] |  |
Disclosure of information for cash-generating units [Line Items] |  |
Goodwill | 384 | 272
Goodwill |  | 384
Americas franchised [member] |  |
Disclosure of information for cash-generating units [Line Items] |  |
Reallocation | (37) |
Americas franchised [member] | Cash-generating units [member] |  |
Disclosure of information for cash-generating units [Line Items] |  |
Goodwill | 37 | 37
Goodwill |  | 37
Europe Middle East Asia and Africa Europe managed [member] |  |
Disclosure of information for cash-generating units [Line Items] |  |
Additions |  | 52
Reallocation | (94) |
Europe Middle East Asia and Africa Europe managed [member] | Cash-generating units [member] |  |
Disclosure of information for cash-generating units [Line Items] |  |
Goodwill | 94 | 42
Goodwill |  | 94
Europe Middle East Asia and Africa Europe franchised [member] |  |
Disclosure of information for cash-generating units [Line Items] |  |
Reallocation | (10) |
Europe Middle East Asia and Africa Europe franchised [member] | Cash-generating units [member] |  |
Disclosure of information for cash-generating units [Line Items] |  |
Goodwill | 10 | 10
Goodwill |  | 10
Europe Middle East Asia and Africa rest of region [member] |  |
Disclosure of information for cash-generating units [Line Items] |  |
Additions |  | 92
Reallocation | (228) |
Europe Middle East Asia and Africa rest of region [member] | Cash-generating units [member] |  |
Disclosure of information for cash-generating units [Line Items] |  |
Goodwill | 228 | 136
Goodwill |  | 228
Greater China [member] |  |
Disclosure of information for cash-generating units [Line Items] |  |
Additions |  | 7
Greater China [member] | Cash-generating units [member] |  |
Disclosure of information for cash-generating units [Line Items] |  |
Goodwill | 25 | 18
Goodwill | 25 | 25
UK Portfolio [member] |  |
Disclosure of information for cash-generating units [Line Items] |  |
Reallocation |  | 49
Impairment charges goodwill |  | (49)
Unallocated [member] |  |
Disclosure of information for cash-generating units [Line Items] |  |
Reallocation |  | (49)
Exchange differences |  | 1
Unallocated [member] | Cash-generating units [member] |  |
Disclosure of information for cash-generating units [Line Items] |  |
Goodwill |  | $ 48
Americas [Member] |  |
Disclosure of information for cash-generating units [Line Items] |  |
Reallocation | 421 |
Americas [Member] | Cash-generating units [member] |  |
Disclosure of information for cash-generating units [Line Items] |  |
Goodwill | 421 |
EMEAA [Member] |  |
Disclosure of information for cash-generating units [Line Items] |  |
Reallocation | 332 |
Exchange differences | 7 |
EMEAA [Member] | Cash-generating units [member] |  |
Disclosure of information for cash-generating units [Line Items] |  |
Goodwill | $ 339 |

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- Definition The amount of additional goodwill recognised, except goodwill included in a disposal group that, on acquisition, meets the criteria to be classified as held for sale in accordance with IFRS 5. [Refer: Goodwill; Disposal groups classified as held for sale [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2020-01-01 -Paragraph B67 -Subparagraph d -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2020-en-r&anchor=para_B67_d_ii&doctype=Appendix&subtype=B -URIDate 2020-01-01 + Details
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- Definition The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2020-01-01 -Paragraph B67 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2020-en-r&anchor=para_B67_d&doctype=Appendix&subtype=B -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2020-01-01 -Paragraph 134 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2020-en-r&anchor=para_134_a&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2020-01-01 -Paragraph 135 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2020-en-r&anchor=para_135_a&doctype=Standard -URIDate 2020-01-01 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of impairment loss recognised in profit or loss for intangible assets and goodwill. [Refer: Impairment loss recognised in profit or loss; Intangible assets and goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2020-01-01 -Paragraph 118 -Subparagraph e -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e_iv&doctype=Standard -URIDate 2020-01-01 + Details
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