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Intangible Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Intangible Assets [Line Items]      
Non-amortizable intangible assets $ 17,527 $ 18,810  
Amortizable intangible assets 2,320 2,525  
Total intangible assets, gross 19,847 21,335 $ 22,919
Accumulated amortization (1,079) (1,000)  
Intangible assets, net $ 18,768 $ 20,335