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Intangible Assets (Detail) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Intangible Assets [Line Items]    
Non-amortizable intangible assets $ 17,852 $ 17,527
Amortizable intangible assets 2,391 2,320
Total intangible assets, gross 20,243 19,847
Accumulated amortization (1,149) (1,079)
Intangible assets, net $ 19,094 $ 18,768