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Goodwill - Summary of Carrying Amount of Goodwill Allocated to Different Cash-generating Units (Detail) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
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Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | $ 115,080 | $ 128,114
United States [member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | 33,452 | 33,451
Rest of North America [member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | 1,956 | 1,984
Mexico [member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | 10,808 | 13,175
Colombia [member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | 16,264 | 18,647
Rest of Middle Americas [member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | 24,211 | 25,257
Brazil [Member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | 3,341 | 4,539
Rest of South America [member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | 1,062 | 1,101
Europe [member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | 2,220 | 2,277
South Africa [member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | 9,420 | 13,500
Rest of Africa [member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | 5,079 | 6,691
China [member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | 3,046 | 3,095
Rest of Asia Pacific [member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | 3,675 | 4,397
Global Export [member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | $ 545 | $ 0

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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 2019-01-01 -Paragraph B67 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2019-en-r&anchor=para_B67_d&doctype=Appendix&subtype=B -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2019-01-01 -Paragraph 134 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2019-en-r&anchor=para_134_a&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2019-01-01 -Paragraph 135 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2019-en-r&anchor=para_135_a&doctype=Standard -URIDate 2019-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_c&doctype=Standard -URIDate 2019-03-27 + Details
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