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Changes in Goodwill and Intangible Assets (Detail)
$ in Millions
 9 Months Ended
Sep. 30, 2016
USD ($)
Goodwill And Intangible Assets [Line Items]  
Goodwill beginning balance $ 20,664
Goodwill, Currency 163
Goodwill, Acquisition (76)
Goodwill, Asset impairments 0
Goodwill, Sale of business and assets 0
Goodwill ending balance 20,751
Intangible Assets, at Cost beginning balance 19,847
Intangible Assets, Currency 48
Intangible Assets, Acquisition 86
Intangible Assets, Asset impairments (30)
Intangible Assets, Sale of business and assets (8)
Intangible Assets, at Cost ending balance $ 19,943