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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill [Line Items]      
Beginning balance [1] $ 24,846 $ 24,917  
Goodwill reclassified as assets to held for sale (27)    
Goodwill disposal   (28)  
Goodwill impairment (4,628)   $ (3,027)
Translation differences 433 (43)  
Ending balance [1] 20,624 24,846 24,917
North America [Member]      
Goodwill [Line Items]      
Beginning balance [1] 11,091 11,098  
Goodwill disposal   (23)  
Goodwill impairment (4,628)    
Translation differences 10 16  
Ending balance [1] 6,473 11,091 11,098
Europe [Member]      
Goodwill [Line Items]      
Beginning balance [1] 8,536 8,653  
Goodwill reclassified as assets to held for sale (8)    
Goodwill disposal   (5)  
Translation differences 574 (112)  
Ending balance [1] 9,102 8,536 8,653
International Markets [Member]      
Goodwill [Line Items]      
Beginning balance [1] 2,532 2,479  
Goodwill reclassified as assets to held for sale (19)    
Translation differences (151) 53  
Ending balance [1] 2,362 2,532 2,479
Other [Member]      
Goodwill [Line Items]      
Beginning balance [1] 2,687 2,687  
Ending balance [1] $ 2,687 $ 2,687 $ 2,687
[1] Accumulated goodwill impairment as of December 31, 2020, December 31, 2019 and December 31, 2018 was approximately $25.6 billion, $21.0 billion and $21.0 billion, respectively.