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Goodwill and Intangible Assets - Expected Amortization of Intangible Assets (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Sep. 30, 2015
Goodwill And Intangible Assets Disclosure [Abstract]    
2017 $ 205  
2018 205  
2019 190  
2020 175  
2021 175  
Thereafter 1,251  
Total net intangible assets subject to amortization $ 2,201 $ 2,514