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Intangible Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Intangible Assets [Line Items]      
Non-amortizable intangible assets $ 17,671 $ 17,004  
Amortizable intangible assets 2,386 2,315  
Total intangible assets, gross 20,057 19,319 $ 19,847
Accumulated amortization (1,418) (1,218)  
Intangible assets, net $ 18,639 $ 18,101