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Acquisitions and Divestitures Acquisitions (Details) $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 02, 2016 USD ($) | Dec. 31, 2015 USD ($) | Jun. 30, 2015 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($)
Business Acquisitions |  |  |  |  |  |
Business Combination, Consideration Transferred | $ 19,671 |  |  | $ 19,700 |  |
Payments to acquire businesses, net of cash acquired |  |  |  | 6 | $ (353) | $ 22
Goodwill, acquired during period |  |  |  | (256) | 16,622 |
Goodwill, purchase accounting adjustments |  |  |  | (258) |  |
Non-cash equity gain from acquisition |  |  |  | 0 | 4 | $ 0
Hitachi Joint Venture [Member] |  |  |  |  |  |
Business Acquisitions |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  | 100.00% |  |  |  |
Goodwill, acquired during period |  | $ 253 |  |  |  |
Payments to Acquire Interest in Joint Venture |  | 208 |  | $ 75 | $ 133 |
Purchase Price of Joint Venture |  | 638 |  |  |  |
Cash Acquired from Acquisition |  | $ 430 |  |  |  |
Business Acquisitions, Not Specified |  |  |  |  |  |
Business Acquisitions |  |  |  |  |  |
Number of Businesses Acquired |  |  |  | 3 | 2 | 3
Business Combination, Consideration Transferred |  |  |  | $ 9 | $ 6 | $ 47
Payments to acquire businesses, net of cash acquired |  |  |  | 6 | 3 | 18
Goodwill, acquired during period |  |  |  | $ 2 | 6 | $ 9
Customer Relationships |  |  |  |  |  |
Business Acquisitions |  |  |  |  |  |
Finite-lived intangible assets acquired | $ 2,280 |  |  |  |  |
Building Efficiency Other | Air Distribution Technologies, Inc. |  |  |  |  |  |
Business Acquisitions |  |  |  |  |  |
Payments to acquire businesses, net of cash acquired |  |  | $ 4 |  |  |
Goodwill, purchase accounting adjustments |  |  | $ 34 |  |  |
Global Products | Business Acquisitions, Not Specified |  |  |  |  |  |
Business Acquisitions |  |  |  |  |  |
Non-cash equity gain from acquisition |  |  |  |  | $ 4 |

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