Supplemental Financial Information - Other Income (Expense), Net (Detail) - USD ($) $ in Millions	1 Months Ended		12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Losses on debt extinguishment	$ 31	$ 42	$ (73)	$ 0	$ 0
Income (Loss) from Equity Method Investments			3	8	9
Losses on undesignated foreign exchange derivatives, net			(11)	(3)	0
Gains on previously held investments			24	0	9
Other			3	7	3
Other (expense) income, net			(57)	11	21
Vyaire Medical [Member]
Income (Loss) from Equity Method Investments			$ (3)	$ 0	$ 0