Summary Of Significant Accounting Policies (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Summary Of Accounting Policies [Line Items]
Investments in publicly traded companies carried at fair value if ownership is less than percent threshold	20.00%
Investments in nonpublicly traded companies carried at cost if ownership is less than percent threshold	20.00%
Finished products	$ 382	$ 418
Raw materials and work in process	826	847
Total inventories	1,208	1,265
Land	210	190
Buildings	1,867	1,762
Machinery and equipment	4,932	4,774
Construction in progress	318	379
Property, plant and equipment, at cost	7,327	7,105
Less: Accumulated depreciation	4,396	4,176
Property, plant and equipment, net	$ 2,931	$ 2,929
Percentage of revenue from multiple deliverable arrangements	5.00%
Collateral balance posted	$ 0
Collateral held from counterparties	0
Collateral balance could have been required to post	47
Undistributed earnings of non-U.S. subsidiaries	$ 5,200
Maximum [Member]
Summary Of Accounting Policies [Line Items]
Investments accounted for by the equity method if ownership percentage is less than/greater than percent threshold	50.00%
Warranty period (in years)	2 years
Percentage of product warranty expenses of sales	1.00%
General duration of hedge positions is equal to or less than (in years)	2 years
Minimum [Member]
Summary Of Accounting Policies [Line Items]
Investments accounted for by the equity method if ownership percentage is less than/greater than percent threshold	20.00%
Warranty period (in years)	1 year
Building [Member] | Maximum [Member]
Summary Of Accounting Policies [Line Items]
Property, plant and equipment, useful life	40 years
Building [Member] | Minimum [Member]
Summary Of Accounting Policies [Line Items]
Property, plant and equipment, useful life	30 years
Machinery and Equipment [Member] | Maximum [Member]
Summary Of Accounting Policies [Line Items]
Property, plant and equipment, useful life	12 years
Machinery and Equipment [Member] | Minimum [Member]
Summary Of Accounting Policies [Line Items]
Property, plant and equipment, useful life	8 years