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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Goodwill [Line Items]      
Beginning balance [1] $ 24,917 $ 28,414  
Goodwill impairment   (3,027) [2] $ (17,100)
Goodwill disposal (28) (79) [3]  
Goodwill reclassified as assets to held for sale   (20)  
Translation differences and other (43) (371)  
Ending balance [1] 24,846 24,917 28,414
North America [Member]      
Goodwill [Line Items]      
Beginning balance [1] 11,098 11,144  
Goodwill disposal (23)    
Translation differences and other 16 (46)  
Ending balance [1] 11,091 11,098 11,144
Europe [Member]      
Goodwill [Line Items]      
Beginning balance [1] 8,653 9,001  
Goodwill disposal (5) (65) [3]  
Goodwill reclassified as assets to held for sale   (3)  
Translation differences and other (112) (280)  
Ending balance [1] 8,536 8,653 9,001
International Markets [Member]      
Goodwill [Line Items]      
Beginning balance [1] 2,479 5,404  
Goodwill impairment [2]   (2,834)  
Goodwill disposal [3]   (14)  
Translation differences and other 53 (77)  
Ending balance [1] 2,532 2,479 5,404
Other [Member]      
Goodwill [Line Items]      
Beginning balance [1] 2,687 2,865  
Goodwill impairment [2]   (193)  
Goodwill reclassified as assets to held for sale   (17)  
Translation differences and other   32  
Ending balance [1] $ 2,687 $ 2,687 $ 2,865
[1] Accumulated goodwill impairment as of December 31, 2019, December 31, 2018 and January 1, 2018 was approximately $21.0 billion, $21.0 billion and $18.0 billion, respectively.
[2] Goodwill impairment mainly attributable to the International Markets segment, Mexico and Medis.
[3] Mainly due to the divestment of the women’s health business, the sale of Actavis Brazil and other activities.