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Intangible Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Intangible Assets [Line Items]      
Non-amortizable intangible assets $ 17,004 $ 17,527  
Amortizable intangible assets 2,315 2,320  
Total intangible assets, gross 19,319 19,847 $ 21,335
Accumulated amortization (1,218) (1,079)  
Intangible assets, net $ 18,101 $ 18,768