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Goodwill - Summary of Carrying Amount of Goodwill Allocated to Different Cash-generating Units (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | $ 115,796 | $ 120,971
United States [member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | 33,607 | 33,552
Rest of North America [member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | 2,114 | 2,105
Mexico [member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | 12,062 | 12,446
Colombia [member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | 15,344 | 17,748
Rest of Middle Americas [member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | 22,769 | 24,036
Brazil [Member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | 3,280 | 3,521
Rest of South America [member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | 1,173 | 1,061
Europe [member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | 2,244 | 2,444
South Africa [member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | 10,231 | 11,110
Rest of Africa [member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | 5,287 | 4,990
China [member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | 3,387 | 3,291
Rest of Asia Pacific [member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | 3,717 | 4,059
Global Export and Holding Companies [member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | $ 582 | $ 608

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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 2021-01-01 -Paragraph B67 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B67_d&doctype=Appendix&subtype=B -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2021-01-01 -Paragraph 134 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2021-en-r&anchor=para_134_a&doctype=Standard -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2021-01-01 -Paragraph 135 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2021-en-r&anchor=para_135_a&doctype=Standard -URIDate 2021-03-24 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 54 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_54_c&doctype=Standard -URIDate 2021-03-24 + Details
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