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Acquisitions and Divestitures Acquisitions (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 02, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($)
Business Acquisitions |  |  |  |  |
Payments for (Proceeds from) Previous Acquisition |  |  | $ 0 | $ 75 | $ 0
Business Combination, Consideration Transferred | $ 19,671 |  |  |  | 19,700
Payments to acquire businesses, net of cash acquired |  |  | 21 | 6 | (353)
Goodwill, acquired during period |  |  | 15 | (256) |
Goodwill, purchase accounting adjustments |  |  |  | $ (258) |
Hitachi Joint Venture [Member] |  |  |  |  |
Business Acquisitions |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  | 60.00% |  |  |
Goodwill, acquired during period |  | $ 253 |  |  |
Payments to Acquire Interest in Joint Venture |  | 208 |  |  | $ 133
Purchase Price of Joint Venture |  | 638 |  |  |
Cash Acquired from Acquisition |  | $ 430 |  |  |
Business Acquisitions, Not Specified |  |  |  |  |
Business Acquisitions |  |  |  |  |
Number of Businesses Acquired |  |  |  | 3 | 2
Business Combination, Consideration Transferred |  |  | 21 | $ 9 | $ 6
Payments to acquire businesses, net of cash acquired |  |  |  | 6 | 3
Goodwill, acquired during period |  |  |  | $ 2 | 6
Customer Relationships |  |  |  |  |
Business Acquisitions |  |  |  |  |
Finite-lived intangible assets acquired | $ 2,280 |  |  |  |
Global Products | Business Acquisitions, Not Specified |  |  |  |  |
Business Acquisitions |  |  |  |  |
Goodwill, acquired during period |  |  | 14 |  |
Non-cash equity gain from acquisition |  |  |  |  | $ 4
Building Solutions EMEA/LA | Business Acquisitions, Not Specified |  |  |  |  |
Business Acquisitions |  |  |  |  |
Goodwill, acquired during period |  |  | $ 1 |  |

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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