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Note 4. Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 12	$ 5
Product Warranty Accrual Disclosure [Abstract]
Intangible Assets, Gross (Excluding Goodwill)	658		$ 656
Finite-Lived Intangible Assets, Accumulated Amortization	(125)		(113)
Intangible Assets, Net (Excluding Goodwill)	533		543
Patents [Member]
Product Warranty Accrual Disclosure [Abstract]
Intangible Assets, Gross (Excluding Goodwill)	30		30
Finite-Lived Intangible Assets, Accumulated Amortization	(16)		(15)
Intangible Assets, Net (Excluding Goodwill)	14		15
Customer Relationships [Member]
Product Warranty Accrual Disclosure [Abstract]
Intangible Assets, Gross (Excluding Goodwill)	546		545
Finite-Lived Intangible Assets, Accumulated Amortization	(74)		(64)
Intangible Assets, Net (Excluding Goodwill)	472		481
Trademarks [Member]
Product Warranty Accrual Disclosure [Abstract]
Intangible Assets, Gross (Excluding Goodwill)	60		59
Finite-Lived Intangible Assets, Accumulated Amortization	(27)		(26)
Intangible Assets, Net (Excluding Goodwill)	33		33
Other Intangible Assets [Member]
Product Warranty Accrual Disclosure [Abstract]
Intangible Assets, Gross (Excluding Goodwill)	22		22
Finite-Lived Intangible Assets, Accumulated Amortization	(8)		(8)
Intangible Assets, Net (Excluding Goodwill)	$ 14		$ 14

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Product Warranty Accrual Disclosure [Abstract]

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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