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Changes in Goodwill and Intangible Assets (Detail)
$ in Millions
 6 Months Ended
Jun. 30, 2016
USD ($)
Goodwill And Intangible Assets [Line Items]  
Goodwill beginning balance $ 20,664
Goodwill, Currency 150
Goodwill, Acquisition (73)
Goodwill, Asset impairments 0
Goodwill, Asset sale 0
Goodwill ending balance 20,741
Intangible Assets, at Cost beginning balance 19,847
Intangible Assets, Currency 57
Intangible Assets, Acquisition 86
Intangible Assets, Asset impairments (26)
Intangible Assets, Asset sale (8)
Intangible Assets, at Cost ending balance $ 19,956