Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2011 Plan Business Segment Entity Person Age Plant lb MetricTon	Sep. 30, 2010	Sep. 30, 2009	Jun. 30, 2011
Carrying amounts and classification of assets and liabilities for consolidated VIE's
Current assets	$ 207	$ 215
Noncurrent assets	55	69
Total assets	262	284
Current liabilities	144	174
Noncurrent liabilities	0	0
Total liabilities	144	174
Summary of Significant Accounting Policies (Textuals)
Investment balance of the Company's nonconsolidated VIEs		41
Interest percentage minimum for investments in partially-owned affiliates to be accounted for by the equity method	20.00%
Amount of reduction in income before income taxes due to an out of period adjustment			62
Number of VIEs in which Company was primary beneficiary	2
The Company holds less than this percentage ownership in its consolidated VIEs	50.00%
Interest percentage acquired in equity method investee				40.00%
Number of years after the closing date at which time the Company has a contractual right to purchase the remaining equity interest in the investee				3 years
Remaining equity interest percentage to be acquired in equity method investee				60.00%
Number of years after the closing date at which time the Company is subject to a contractual obligation at the counterparty's option to sell the Company's equity investment in the investee to the counterparty				5 years 6 months
Number of months the Company has to set the date of the put closing, reorganize the ownership structure or secure a third party buyer once notice has been received	12 months
Maturity period to be considered cash equivalents	three months or less
Engineering and research and development costs to be reimbursed	215	304
Molds, dies and other tools costs capitalized within property, plant and equipment	109	72
Molds, dies and other tools costs to be reimbursed	254	212
Costs and earnings in excess of billings on uncompleted contracts (included in accounts receivable - net)	773	683
Billing in excess of costs and earnings on uncompleted contracts (included in other current liabilities)	730	639
Timing of the first deliverable to the last delivery	approximately four to twelve months
Duration of extended warranty arrangements	one to five years commencing upon the end of the standard warranty period
Research activities costs relating to product development and improvement, net of customer reimbursements	876	723	767
Customer reimbursements included in research activities costs	366	315	431
Foreign currency transaction gains (losses)	(30)	50	(18)
Buildings and improvements [Member]
Summary of Significant Accounting Policies (Textuals)
Estimated useful lives, Minimum	10
Estimated useful lives, Maximum	40
Machinery and equipment [Member]
Summary of Significant Accounting Policies (Textuals)
Estimated useful lives, Minimum	3
Estimated useful lives, Maximum	15
Nonconsolidated VIEs 1 [Member]
Summary of Significant Accounting Policies (Textuals)
Investment balance of the Company's nonconsolidated VIEs	43
Nonconsolidated VIEs 2 [Member]
Summary of Significant Accounting Policies (Textuals)
Investment balance of the Company's nonconsolidated VIEs	$ 49