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Debt and Financing Arrangements Financing Arrangements (Details) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2019 EUR (€) | Sep. 30, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from Issuance of Unsecured Debt |  | $ 2,000,000,000.0 |  |  |
Tyco International Holding S.a.r.L. (TSarL) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt |  | $ 4,000,000,000.0 |  |  | $ 4,000,000,000.0
Repayments of Debt | $ 1,900,000,000 |  |  |  |
Tyco International Holding S.a.r.L. (TSarL) [Member] | LIBOR plus One Point Two Five Percent Due in Two Thousand Twenty [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt |  |  |  |  | 364,000,000
Johnson Controls International plc [Member] | Three Point Six Two Five Percent Due Two Thousand Twenty Four [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt |  |  | $ 453,000,000 |  | 468,000,000
Debt instrument, face amount |  |  | $ 453,000,000 |  |
Interest rate on notes |  |  | 3.625% | 3.625% |
Johnson Controls International plc [Member] | Four Point Nine Five Percent Due Two Thousand Sixty Four [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt |  |  | $ 340,000,000 |  | 434,000,000
Debt instrument, face amount |  |  | $ 341,000,000 |  |
Interest rate on notes |  |  | 4.95% | 4.95% |
Johnson Controls International plc [Member] | Zero Point Zero Percent Due Two Thousand Twenty-One [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt |  |  | $ 818,000,000 |  | $ 868,000,000
Debt instrument, face amount | € |  |  |  | € 750,000,000 |
Interest rate on notes |  |  | 0.00% | 0.00% |

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