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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
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