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Acquisitions and Divestitures Divestitures (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Mar. 31, 2017 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($)
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |
Business divestitures, net of cash divested |  |  |  |  |  |  |  | $ 2,202 | $ 220 | $ 32
Goodwill, written off related to divestiture |  |  |  |  |  |  |  | 35 | 1,269 |
Gain on divestitures - net |  |  |  |  |  |  |  | 114 | $ 0 | $ 0
Building Solutions North America |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from divestitures |  |  |  |  |  |  | $ 16 |  |  |
Goodwill, written off related to divestiture |  |  |  |  |  |  | $ 3 |  |  |
Series of Individually Immaterial Business Acquisitions [Member] |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Businesses Acquired |  |  |  |  |  |  |  |  | 3 | 2
Nonredeemable Noncontrolling Interest |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from divestitures |  |  |  |  |  |  |  |  | $ 4 |
Scott Safety business [Member] |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |
Business divestitures, net of cash divested |  |  |  | $ 2,000 |  |  |  |  |  |
Gain (loss) on divestiture |  |  |  | 114 |  |  |  |  |  |
Goodwill, written off related to divestiture |  |  |  | 1,200 |  |  |  |  |  |
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax |  |  |  | 84 |  |  |  |  |  |
Income tax expense from disposal |  |  |  | 30 |  |  |  |  |  |
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 |  |  |  |  |
Business Divestitures, Not Specific |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |
Number of businesses divested |  |  |  |  |  | 2 |  |  | 2 |
Proceeds from divestitures |  |  |  |  |  |  |  |  | $ 44 |
Business divestitures, net of cash divested |  |  |  |  |  |  |  |  | 40 | $ 29
Cash Divested from Deconsolidation |  |  |  |  |  |  |  |  | 5 |
Business Divestitures, Not Specific | Global Products |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from divestitures |  |  |  |  |  | $ 39 |  | 204 |  |
Goodwill, written off related to divestiture |  |  |  |  |  | 16 |  | $ 35 | 19 |
Cash Divested from Deconsolidation |  |  |  |  |  | 13 |  |  |  |
Business Divestitures, Not Specific | Building Solutions Asia Pacific |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill, written off related to divestiture |  |  |  |  |  |  |  |  | $ 2 |
Controlling to Noncontrolling interest [Member] |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |
Number of businesses divested |  |  |  |  |  |  |  |  | 1 |
Tyco International Holding S.a.r.L. (TSarL) [Member] |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of Debt | $ 450 | $ 400 | $ 26 | $ 1,900 |  |  |  |  | $ 300 |
Long-term Debt |  |  |  |  |  | $ 4,000 |  |  |  | $ 4,000
Prior year business divestitures [Member] | Business Divestitures, Not Specific |  |  |  |  |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |  |  |  |  |
Business divestitures, net of cash divested |  |  |  |  |  |  |  |  | $ 52 |

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