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Segment Information Financial Information Related to Company's Reportable Segments (Additional Information) (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 USD ($) Segment | Jun. 30, 2016 USD ($) | Jun. 30, 2017 Segment | Sep. 30, 2017 USD ($) Segment | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($)
Segment Information [Line Items] |  |  |  |  |  |
Number of reportable segments | Segment | 4 |  | 5 | 5 |  |
Restructuring and impairment costs |  |  |  | $ (367) | $ (288) | $ (215)
Equity income in segment income |  |  |  | 240 | 174 | 80
Gain (loss) on business divestitures - net |  |  |  | 9 | 26 | 1,340
Power Solutions |  |  |  |  |  |
Segment Information [Line Items] |  |  |  |  |  |
Restructuring and impairment costs |  |  |  | 20 | 66 | 11
Equity income in segment income |  |  |  | 83 | 48 | 57
Equity Method Investments | $ 447 |  |  | 447 | 367 | 343
Building Solutions North America |  |  |  |  |  |
Segment Information [Line Items] |  |  |  |  |  |
Gain (loss) on business divestitures - net |  | $ 14 |  |  |  |
Building Solutions North America | Building Technologies & Solutions |  |  |  |  |  |
Segment Information [Line Items] |  |  |  |  |  |
Restructuring and impairment costs |  |  |  | 59 |  | 2
Global Products |  |  |  |  |  |
Segment Information [Line Items] |  |  |  |  |  |
Equity Method Investments | 637 |  |  | 637 | 520 | 64
Global Products | Building Technologies & Solutions |  |  |  |  |  |
Segment Information [Line Items] |  |  |  |  |  |
Restructuring and impairment costs |  |  |  | 32 | (44) | (20)
Equity income in segment income |  |  |  | 151 | 114 | 9
Building Solutions EMEA/LA |  |  |  |  |  |
Segment Information [Line Items] |  |  |  |  |  |
Equity Method Investments | $ 107 |  |  | 107 | 103 | 90
Building Solutions EMEA/LA | Building Technologies & Solutions |  |  |  |  |  |
Segment Information [Line Items] |  |  |  |  |  |
Restructuring and impairment costs |  |  |  | 74 | 17 | 9
Equity income in segment income |  |  |  | $ 5 | $ 11 | $ 14

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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(12)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(10)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(f)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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