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Intangible Assets (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Intangible Assets [Line Items]    
Non-amortizable intangible assets $ 17,603 $ 17,527
Amortizable intangible assets 2,340 2,320
Total intangible assets, gross 19,943 19,847
Accumulated amortization (1,222) (1,079)
Intangible assets, net $ 18,721 $ 18,768