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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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- Definition 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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