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Changes in Goodwill and Intangible Assets (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill And Intangible Assets [Line Items]      
Goodwill beginning balance $ 20,276,000,000 $ 20,664,000,000  
Goodwill, Currency 909,000,000 (464,000,000)  
Goodwill, Divestitures (114,000,000) (4,000,000)  
Goodwill, Acquisitions 15,000,000 80,000,000  
Goodwill, Asset impairments 0 0 $ 0
Goodwill, Other (1,000,000) 0  
Goodwill ending balance 21,085,000,000 20,276,000,000 20,664,000,000
Intangible Assets, at Cost beginning balance 19,319,000,000 19,847,000,000  
Intangible Assets, Currency 954,000,000 (540,000,000)  
Intangible Assets, Divestitures (100,000,000) (8,000,000)  
Intangible Assets, Acquisitions (7,000,000) 158,000,000  
Intangible Assets, Asset impairments (109,000,000) (137,000,000) (83,000,000)
Intangible Assets, Other 0 (1,000,000)  
Intangible Assets, at Cost ending balance $ 20,057,000,000 $ 19,319,000,000 $ 19,847,000,000