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Changes in Goodwill and Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Goodwill And Intangible Assets [Line Items]    
Goodwill beginning balance $ 25,740 $ 37,234
Foreign currency, Goodwill (336) 438
Divestitures, Goodwill (13) (11,932)
Asset impairments, Goodwill      
Acquisitions, Goodwill 209  
Other, Goodwill (3)  
Goodwill ending balance 25,597 25,740
Intangible Assets, at cost beginning balance 23,269 25,712
Foreign currency, Intangible Assets, at Cost (390) 262
Divestitures, Intangible Assets, at cost (7) (2,669)
Asset impairments, Intangible Assets, at Cost   (52)
Acquisitions, Intangible Assets, at Cost 48 14
Other, Intangible Assets, at Cost (1) 2
Intangible Assets, at cost ending balance $ 22,919 $ 23,269