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Goodwill - Summary of Changes in the Carrying Amount of Goodwill by Segment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Goodwill [Line Items]      
Beginning balance $ 20,624 $ 24,846 [1]  
Goodwill reclassified as assets to held for sale (18) (27)  
Goodwill impairment 0 (4,628) $ 0
Translation differences (566) 433  
Ending balance 20,040 20,624 24,846 [1]
North America [Member]      
Goodwill [Line Items]      
Beginning balance 6,473 11,091 [1]  
Goodwill impairment   (4,628)  
Translation differences 1 10  
Ending balance 6,474 6,473 11,091 [1]
Europe [Member]      
Goodwill [Line Items]      
Beginning balance 9,102 8,536 [1]  
Goodwill reclassified as assets to held for sale (7) (8)  
Translation differences (551) 574  
Ending balance 8,544 9,102 8,536 [1]
International Markets [Member]      
Goodwill [Line Items]      
Beginning balance 2,362 2,532 [1]  
Goodwill reclassified as assets to held for sale   (19)  
Translation differences (34) (151)  
Ending balance 2,328 2,362 2,532 [1]
Other [Member]      
Goodwill [Line Items]      
Beginning balance 2,687 2,687 [1]  
Goodwill reclassified as assets to held for sale (11)    
Translation differences 18    
Ending balance $ 2,694 $ 2,687 $ 2,687 [1]
[1] Accumulated goodwill impairment as of December 31, 2021, December 31, 2020 and December 31, 2019 was approximately $25.6 billion, $25.6 billion and $21.0 billion, respectively.