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Goodwill - Summary of Carrying Amount of Goodwill Allocated to Different Cash-generating Units (Detail) - USD ($) $ in Millions | Jun. 30, 2026 | Dec. 31, 2025
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Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | $ 119,946 | $ 117,908
United States [member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | 33,672 | 33,330
Rest of North America [member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | 1,884 | 1,959
Mexico [member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | 14,212 | 13,819
Colombia [member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | 17,731 | 16,277
Rest of Middle Americas [member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | 24,255 | 24,465
Brazil [Member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | 3,532 | 3,323
Rest of South America [member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | 1,351 | 1,323
Europe [member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | 2,780 | 2,859
South Africa [member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | 9,901 | 9,796
Rest of Africa [member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | 4,608 | 4,626
China [member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | 3,171 | 3,073
Rest of Asia Pacific [member] |  |
Disclosure Of Carrying Amount Of Goodwill [line items] |  |
Goodwill | $ 2,849 | $ 3,057

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