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Changes in Goodwill and Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Goodwill And Intangible Assets [Line Items]  
Goodwill beginning balance $ 25,597
Currency, Goodwill (189)
Goodwill ending balance 25,408
Intangible Assets, at Cost beginning balance 22,919
Currency, Intangible Assets, at Cost 56
Intangible Assets, at Cost ending balance $ 22,975