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Intangible Assets (Detail) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Intangible Assets [Line Items]    
Non-amortizable intangible assets $ 17,618 $ 17,527
Amortizable intangible assets 2,338 2,320
Total intangible assets, gross 19,956 19,847
Accumulated amortization (1,175) (1,079)
Intangible assets, net $ 18,781 $ 18,768