Statement of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 962	$ (1,462)	$ 526
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(133)	(36)	(520)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	17	3	(11)
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), Net of Tax	0	(1)	0
Other Comprehensive Income (Loss), Net of Tax	(116)	(34)	(531)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	846	(1,496)	(5)
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	90	79	58
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	756	(1,575)	(63)
Other Comprehensive Income (Loss) [Member]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(138)	(31)	(512)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	6	26	5
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), Net of Tax	$ 0	$ (1)	$ 0