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Intangible Assets (Detail) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Intangible Assets [Line Items]    
Non-amortizable intangible assets $ 17,625 $ 17,004
Amortizable intangible assets 2,414 2,315
Total intangible assets, gross 20,039 19,319
Accumulated amortization (1,401) (1,218)
Intangible assets, net $ 18,638 $ 18,101