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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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- 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=66902209&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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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