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Changes in Goodwill and Intangible Assets (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Goodwill And Intangible Assets [Line Items]      
Goodwill beginning balance $ 20,664 $ 23,389  
Goodwill, Currency (464) (1,477)  
Goodwill, written off related to sale of business unit (4) (1,729)  
Goodwill, Acquisition 80 481  
Goodwill, Asset impairments 0 0 $ 0
Goodwill, Other 0 0  
Goodwill ending balance 20,276 20,664 23,389
Intangible Assets, at Cost beginning balance 19,847 21,335  
Intangible Assets, Currency (540) (1,462)  
Intangible Assets, Written off related to divested business unit (8)    
Intangible Assets, Acquisition 158 58  
Intangible Assets, Asset impairments (137) (83) (57)
Intangible Assets, Other (1) (1)  
Intangible Assets, at Cost ending balance $ 19,319 $ 19,847 $ 21,335