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Goodwill - Reconciliation of Goodwill (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of reconciliation of changes in goodwill [line items]        
Goodwill beginning balance   $ 120,971    
Impairment losses $ (2,500)   $ (2,500)  
Hyperinflation monetary adjustments   152 76 $ 86
Goodwill ending balance   115,796 120,971  
Carrying amount   115,796 120,971  
Gross carrying amount [member]        
Disclosure of reconciliation of changes in goodwill [line items]        
Goodwill beginning balance   123,702 128,119  
Effect of movements in foreign exchange   (5,456) (4,723)  
Acquisitions through business combinations     185  
Transfers (to)/from intangible assets   18    
Hyperinflation monetary adjustments   196 120  
Goodwill ending balance   118,461 123,702 128,119
Carrying amount   118,461 123,702 128,119
Impairment losses [member]        
Disclosure of reconciliation of changes in goodwill [line items]        
Goodwill beginning balance   (2,731) (5)  
Effect of movements in foreign exchange   66 (226)  
Impairment losses     (2,500)  
Goodwill ending balance   (2,665) (2,731) (5)
Carrying amount   $ (2,665) $ (2,731) $ (5)