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Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Intangible Assets [Line Items]    
Non-amortizable intangible assets $ 20,111 $ 20,067
Amortizable intangible assets 2,864 2,852
Total intangible assets, gross 22,975 22,919
Accumulated amortization (983) (925)
Intangible assets, net $ 21,992 $ 21,994