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Changes in Goodwill and Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Goodwill And Intangible Assets [Line Items]  
Goodwill beginning balance $ 25,597
Currency (121)
Other 51
Goodwill ending balance 25,527
Intangible Assets, at Cost beginning balance 22,919
Currency 187
Intangible Assets, at Cost ending balance $ 23,106