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Goodwill - Reconciliation of Goodwill (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Disclosure of reconciliation of changes in goodwill [line items]        
Goodwill beginning balance   $ 128,114    
Impairment losses $ (2,500) (2,500)    
Acquisitions through business combinations   14 $ 307  
Hyperinflation monetary adjustments   (30) (48)  
Goodwill ending balance 115,080 115,080   $ 128,114
Carrying amount 115,080 115,080   128,114
Gross carrying amount [member]        
Disclosure of reconciliation of changes in goodwill [line items]        
Goodwill beginning balance   128,119 133,316 133,316
Effect of movements in foreign exchange   (10,658)   53
Acquisitions through business combinations   73   682
Disposals through the sale of subsidiaries       (22)
Hyperinflation monetary adjustments   51   171
Reclassified as held for sale       (6,081)
Goodwill ending balance 117,585 117,585   128,119
Carrying amount 117,585 117,585 133,316 133,316
Impairment losses [member]        
Disclosure of reconciliation of changes in goodwill [line items]        
Goodwill beginning balance   (5) (5) (5)
Impairment losses   (2,500)    
Goodwill ending balance (2,505) (2,505)   (5)
Carrying amount $ (2,505) $ (2,505) $ (5) $ (5)