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Note 5. Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 21	$ 17	$ 18
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	49
Finite-Lived Intangible Assets, Amortization Expense, Year Three	47
Product Warranty Accrual Disclosure [Abstract]
Intangible Assets, Gross (Excluding Goodwill)	656	199
Finite-Lived Intangible Assets, Accumulated Amortization	(113)	(86)
Intangible Assets, Net (Excluding Goodwill)	543	113
Patents [Member]
Product Warranty Accrual Disclosure [Abstract]
Intangible Assets, Gross (Excluding Goodwill)	30	28
Finite-Lived Intangible Assets, Accumulated Amortization	(15)	(13)
Intangible Assets, Net (Excluding Goodwill)	15	15
Customer Relationships [Member]
Product Warranty Accrual Disclosure [Abstract]
Intangible Assets, Gross (Excluding Goodwill)	545	100
Finite-Lived Intangible Assets, Accumulated Amortization	(64)	(48)
Intangible Assets, Net (Excluding Goodwill)	481	52
Trademarks [Member]
Product Warranty Accrual Disclosure [Abstract]
Intangible Assets, Gross (Excluding Goodwill)	59	56
Finite-Lived Intangible Assets, Accumulated Amortization	(26)	(19)
Intangible Assets, Net (Excluding Goodwill)	33	37
Other Intangible Assets [Member]
Product Warranty Accrual Disclosure [Abstract]
Intangible Assets, Gross (Excluding Goodwill)	22	15
Finite-Lived Intangible Assets, Accumulated Amortization	(8)	(6)
Intangible Assets, Net (Excluding Goodwill)	$ 14	$ 9

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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
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-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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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount before accumulated amortization of intangible assets, excluding goodwill.

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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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