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Intangible Assets (Detail) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Intangible Assets [Line Items]    
Non-amortizable intangible assets $ 17,812 $ 18,810
Amortizable intangible assets 2,351 2,525
Total intangible assets, gross 20,163 21,335
Accumulated amortization (1,048) (1,000)
Intangible assets, net $ 19,115 $ 20,335