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Acquisitions and Divestitures Divestitures (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 04, 2017 USD ($) | Sep. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($)
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of businesses divested |  | 2 |  |  |  |  |  |  |  |  |
Business divestitures, net of cash divested |  |  |  |  |  |  |  |  | $ 220 | $ 32 | $ 1,646
Goodwill, written off related to divestiture |  |  |  |  |  |  |  |  | 1,269 | 19 |
Gain on divestitures - net |  |  |  |  |  |  |  |  | $ 9 | $ 26 | $ 1,340
Building Solutions North America |  |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill, written off related to divestiture |  |  |  |  |  | $ 3 |  |  |  |  |
Sales Price of Business Divestitures |  |  |  |  |  | 16 |  |  |  |  |
Gain on divestitures - net |  |  |  |  |  | $ 14 |  |  |  |  |
Series of Individually Immaterial Business Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of Businesses Acquired |  |  |  |  |  |  |  |  | 3 | 2 | 3
ADT security business in South Africa [Member] | Building Solutions EMEA/LA |  |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business divestitures, net of cash divested |  |  | $ 129 |  |  |  |  |  |  |  |
Goodwill, written off related to divestiture |  |  | $ 92 |  |  |  |  |  |  |  |
CBRE Group, Inc. [Member] [Member] | Global Workplace Solutions |  |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestitures |  |  |  |  |  |  | $ 1,400 |  |  |  |
Goodwill, written off related to divestiture |  |  |  |  |  |  | 220 |  |  |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax |  |  |  |  |  |  | 940 |  |  |  |
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax |  |  |  |  |  |  | 643 |  |  |  |
Income tax expense from disposal |  |  |  |  |  |  |  |  |  |  | $ 297
Yanfeng Automotive Trim Systems [Member] | Automotive Experience Interiors |  |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill, written off related to divestiture |  |  |  |  |  |  | 21 |  |  |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax |  |  |  |  |  |  | 145 |  |  |  |
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax |  |  |  |  |  |  | $ 38 |  |  |  |
Brookfield Johnson Controls [Member] | Global Workplace Solutions |  |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill, written off related to divestiture |  |  |  |  |  |  |  | $ 20 |  |  |
Number of Joint Ventures Divested |  |  |  |  |  |  |  | 2 |  |  |
Proceeds from Divestiture of Interest in Joint Venture |  |  |  |  |  |  |  | $ 141 |  |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax |  |  |  |  |  |  |  | 200 |  |  |
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax |  |  |  |  |  |  |  | $ 127 |  |  |
Income tax expense from disposal |  |  |  |  |  |  |  |  |  |  | $ 73
Business Divestitures, Not Specific |  |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of businesses divested |  |  |  | 1 | 2 |  |  |  |  |  | 4
Proceeds from divestitures |  | $ 44 |  | $ 4 | $ 39 |  |  |  |  |  | $ 119
Business divestitures, net of cash divested |  | 40 |  |  |  |  |  |  | $ 52 | $ 29 | 86
Gain (loss) on divestiture |  | 9 |  |  | 12 |  |  |  |  |  | 10
Cash Divested from Deconsolidation |  |  |  | $ 5 | 13 |  |  |  |  |  |
Business Divestitures, Not Specific | Automotive Experience Seating |  |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill, written off related to divestiture |  |  |  |  |  |  |  |  |  |  | 4
Business Divestitures, Not Specific | Building Solutions North America |  |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on divestiture |  |  |  |  |  |  |  |  |  |  | 7
Goodwill, written off related to divestiture |  |  |  |  |  |  |  |  |  |  | 2
Business Divestitures, Not Specific | Building Efficiency Products North America [Member] |  |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on divestiture |  |  |  |  |  |  |  |  |  |  | 38
Business Divestitures, Not Specific | Global Products |  |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill, written off related to divestiture |  | 19 |  |  | 16 |  |  |  |  |  | $ 14
Business Divestitures, Not Specific | Building Solutions Asia Pacific |  |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill, written off related to divestiture |  | $ 2 |  |  |  |  |  |  |  |  |
Tyco International Holding S.a.r.L. (TSarL) [Member] |  |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  |  |  |  |  |  | $ 300 |  |
Long-term Debt |  |  |  |  | $ 4,000 |  |  |  |  | $ 4,000 |
Subsequent Event [Member] | Scott Safety business [Member] |  |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestitures | $ 2,000 |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Tyco International Holding S.a.r.L. (TSarL) [Member] |  |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt | $ 1,900 |  |  |  |  |  |  |  |  |  |

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