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Changes in Goodwill and Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Goodwill And Intangible Assets [Line Items]  
Goodwill beginning balance $ 25,597
Currency (1,248)
Other 50
Goodwill ending balance 24,399
Intangible Assets, at Cost beginning balance 22,919
Currency (808)
Other 1
Intangible Assets, at Cost ending balance $ 22,112