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Goodwill - Summary of Changes in the Carrying Amount of Goodwill by Segment (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Goodwill [Line Items]  
Beginning balance $ 24,917
Goodwill reclassified as assets to held for sale (28)
Translation differences (67)
Ending balance 24,822
North America [Member]  
Goodwill [Line Items]  
Beginning balance 11,098
Goodwill reclassified as assets to held for sale (23)
Translation differences 8
Ending balance 11,083
Europe [Member]  
Goodwill [Line Items]  
Beginning balance 8,653
Goodwill reclassified as assets to held for sale (5)
Translation differences (117)
Ending balance 8,531
International Markets [Member]  
Goodwill [Line Items]  
Beginning balance 2,479
Translation differences 41
Ending balance 2,520
Other [Member]  
Goodwill [Line Items]  
Beginning balance 2,687
Translation differences 1
Ending balance $ 2,688