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Acquisitions and Divestitures Acquisitions (Details) $ in Millions | 12 Months Ended
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Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Business Acquisitions |  |  |
Payments for (Proceeds from) Previous Acquisition | $ 0 | $ 0 | $ 75
Business Combination, Consideration Transferred | 32 |  |
Payments to acquire businesses, net of cash acquired | 25 | 21 | $ 6
Goodwill, acquired during period | 25 | 15 |
Business Acquisitions, Not Specified |  |  |
Business Acquisitions |  |  |
Number of Businesses Acquired |  |  | 3
Business Combination, Consideration Transferred |  | 21 | $ 9
Payments to acquire businesses, net of cash acquired | 25 |  | 6
Goodwill, acquired during period |  |  | $ 2
Global Products | Business Acquisitions, Not Specified |  |  |
Business Acquisitions |  |  |
Goodwill, acquired during period | 11 | 14 |
Building Solutions Asia Pacific | Business Acquisitions, Not Specified |  |  |
Business Acquisitions |  |  |
Goodwill, acquired during period | 8 |  |
Building Solutions EMEA/LA | Business Acquisitions, Not Specified |  |  |
Business Acquisitions |  |  |
Goodwill, acquired during period | $ 6 | $ 1 |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477 + Details
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