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Changes in Goodwill and Intangible Assets (Detail)
$ in Millions
 3 Months Ended
Mar. 31, 2016
USD ($)
Goodwill And Intangible Assets [Line Items]  
Goodwill beginning balance $ 20,664
Goodwill, Currency 389
Goodwill, Acquisition (76)
Goodwill, Asset impairments 0
Goodwill ending balance 20,977
Intangible Assets, at Cost beginning balance 19,847
Intangible Assets, Currency 323
Intangible Assets, Acquisition 87
Intangible Assets, Asset impairments (14)
Intangible Assets, at Cost ending balance $ 20,243