Retirement Plans (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
U.S. Pension Plans [Member]
Components of Net Periodic Benefit Cost:
Service cost	$ 16	$ 16	$ 49	$ 50
Interest cost	36	38	108	114
Expected return on plan assets	(53)	(44)	(157)	(134)
Amortization of net actuarial loss	14	8	42	22
Amortization of prior service cost (credit)	1		1	1
Net periodic benefit cost	14	18	43	53
Non-U.S. Pension Plans [Member]
Components of Net Periodic Benefit Cost:
Service cost	9	9	26	28
Interest cost	17	16	51	51
Expected return on plan assets	(20)	(15)	(58)	(47)
Amortization of net actuarial loss	3	3	9	8
Amortization of prior service cost (credit)			1
Settlement loss				1
Curtailment gain			(19)
Net periodic benefit cost	9	13	10	41
Postretirement Health and Other Benefits [Member]
Components of Net Periodic Benefit Cost:
Service cost	1	1	3	3
Interest cost	3	4	10	11
Amortization of net actuarial loss	1		2
Amortization of prior service cost (credit)	(4)	(4)	(13)	(13)
Net periodic benefit cost	$ 1	$ 1	$ 2	$ 1