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Changes in Goodwill and Intangible Assets (Detail)
$ in Millions
 9 Months Ended
Sep. 30, 2015
USD ($)
Goodwill And Intangible Assets [Line Items]  
Goodwill beginning balance $ 23,389
Goodwill, Currency (1,196)
Goodwill, Deconsolidation and divestiture (1,729)
Goodwill, Acquisition 500
Goodwill, Other (1)
Goodwill ending balance 20,963
Intangible Assets, at Cost beginning balance 21,335
Intangible Assets, Currency (1,229)
Intangible Assets, Acquisition 58
Intangible Assets, Other (1)
Intangible Assets, at Cost ending balance $ 20,163