Business Restructuring Reserves And Programs Restructuring Reserve (Details) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Jun. 30, 2015 USD ($)	Sep. 30, 2014 USD ($) Position	Jun. 30, 2014 USD ($) Position	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net	$ 7		$ 45	$ 32	$ 94	$ 165	$ 26
Fiscal 2014 Restructuring Program
Restructuring Reserve [Roll Forward]
Balance as of October 1, 2014				122
Cash payments				(33)
Adjustments				3
Impact of foreign currency fluctuations				(11)
Balance as of June 30, 2015	81	$ 122		81		122
Fiscal 2008-2013 Restructuring Programs
Restructuring Reserve [Roll Forward]
Balance as of October 1, 2014				83
Cash payments				(20)
Adjustments				4
Impact of foreign currency fluctuations				(7)
Balance as of June 30, 2015	60	83		60		83
Fiscal 2015 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net				25
Restructuring Reserve [Roll Forward]
Cash payments				(12)
Impact of foreign currency fluctuations				(1)
Balance as of June 30, 2015	12			12
Employee Separation Costs | Fiscal 2014 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net				24		155
Restructuring Reserve [Roll Forward]
Balance as of October 1, 2014				115
Cash payments				(30)
Adjustments				0
Impact of foreign currency fluctuations				(11)
Balance as of June 30, 2015	74	115		74		115
Employee Separation Costs | Fiscal 2008-2013 Restructuring Programs
Restructuring Reserve [Roll Forward]
Balance as of October 1, 2014				9
Cash payments				(6)
Adjustments				1
Impact of foreign currency fluctuations				(1)
Balance as of June 30, 2015	3	9		3		9
Employee Separation Costs | Fiscal 2015 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net				24
Restructuring Reserve [Roll Forward]
Cash payments				(12)
Impact of foreign currency fluctuations				(1)
Balance as of June 30, 2015	11			11
Lease Obligations | Fiscal 2014 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net						9
Restructuring Reserve [Roll Forward]
Balance as of October 1, 2014				7
Cash payments				(3)
Adjustments				3
Impact of foreign currency fluctuations				0
Balance as of June 30, 2015	7	7		7		7
Lease Obligations | Fiscal 2008-2013 Restructuring Programs
Restructuring Reserve [Roll Forward]
Balance as of October 1, 2014				74
Cash payments				(14)
Adjustments				3
Impact of foreign currency fluctuations				(6)
Balance as of June 30, 2015	57	74		57		74
Lease Obligations | Fiscal 2015 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net				1
Restructuring Reserve [Roll Forward]
Cash payments				0
Impact of foreign currency fluctuations				0
Balance as of June 30, 2015	$ 1			$ 1
US Enhanced Separation Program | Employee Separation Costs | Fiscal 2014 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net						$ 10
EMEA approved plan | Employee Separation Costs | Fiscal 2014 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net		$ 39
Restructuring and Related Cost, Number of Positions Eliminated | Position		165	121