Debt and Other Obligations - Schedule of Future Years Payment (Detail) $ in Millions	Sep. 30, 2016 USD ($)
Debt Disclosure [Abstract]
2018	$ 250
2019	30
Thereafter	627
Total	907
2017	2
2018	3
2019	2
2020	2
2021	2
Thereafter	9
Less: Interest	(7)
Total	13
2017	2
2018	253
2019	32
2020	2
2021	2
Thereafter	636
Total	$ 920