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Intangible Assets (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Intangible Assets [Line Items]    
Non-amortizable intangible assets $ 19,460 $ 20,067
Amortizable intangible assets 2,652 2,852
Total intangible assets, gross 22,112 22,919
Accumulated amortization (1,002) (925)
Intangible assets, net $ 21,110 $ 21,994