Benefit Obligations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Pension Benefits - U.S.
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer			$ 61
Estimated future employer contributions in current fiscal year			28
Benefits paid			5
Expected future benefit payments, remainder of fiscal year	$ 2		2
Components of Net Periodic Benefit Cost
Service cost	1	$ 2	3	$ 4
Interest cost	34	36	102	109
Expected return on plan assets	(45)	(43)	(134)	(127)
Amortization of unrecognized prior service cost	1	0	1	0
Amortization of previously unrecognized net actuarial loss	24	21	73	62
Net periodic benefit cost	15	16	45	48
Pension Benefits - Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Benefits paid			21
Expected future benefit payments, remainder of fiscal year	6		6
Components of Net Periodic Benefit Cost
Service cost	2	1	5	5
Interest cost	3	5	11	16
Expected return on plan assets	0	(1)	(1)	(2)
Amortization of unrecognized prior service cost	0	0	0	0
Amortization of previously unrecognized net actuarial loss	1	1	5	3
Net periodic benefit cost	6	6	20	22
Postretirement Benefits - U.S.
Defined Benefit Plan Disclosure [Line Items]
Estimated future employer contributions in current fiscal year			11
Benefits paid			4
Expected future benefit payments, remainder of fiscal year	1		1
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year			12
Components of Net Periodic Benefit Cost
Service cost	0	0	1	1
Interest cost	5	6	15	17
Expected return on plan assets	(2)	(3)	(7)	(9)
Amortization of unrecognized prior service cost	(4)	(3)	(10)	(9)
Amortization of previously unrecognized net actuarial loss	2	1	4	3
Net periodic benefit cost	$ 1	$ 1	3	$ 3
NETHERLANDS | Other Restructuring
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Curtailments			1
GERMANY | Other Restructuring
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Curtailments			$ (1)