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Changes in Goodwill and Intangible Assets (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Goodwill And Intangible Assets [Line Items]        
Goodwill beginning balance     $ 20,276,000,000  
Goodwill, Currency     889,000,000  
Goodwill, Divestitures     (109,000,000)  
Goodwill, Acquisition     15,000,000  
Goodwill, Asset impairments     0 $ 0
Goodwill ending balance $ 21,071,000,000   21,071,000,000  
Intangible Assets, at Cost beginning balance     19,319,000,000  
Intangible Assets, Currency     898,000,000  
Intangible Assets, Divestitures     (62,000,000)  
Intangible Assets, Acquisition     (7,000,000)  
Intangible Assets, Asset impairments (1,000,000) $ (38,000,000) (109,000,000)  
Intangible Assets, at Cost ending balance $ 20,039,000,000   $ 20,039,000,000