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Debt and Financing Arrangements Long-Term Debt (Details) | Sep. 30, 2019 USD ($) | Sep. 30, 2019 EUR (€) | Sep. 30, 2019 JPY (¥) | Sep. 30, 2018 USD ($) | Sep. 30, 2016 USD ($)
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Debt Instrument [Line Items] |  |  |  |  |
Other Long-term Debt | $ 3,000,000 |  |  | $ 3,000,000 |
Long-term Debt and Capital Lease Obligations, Including Current Maturities | 7,240,000,000 |  |  | 9,668,000,000 |
Less: current portion | 501,000,000 |  |  | 1,000,000 |
Debt Issuance Costs, Line of Credit Arrangements, Gross | 31,000,000 |  |  | 44,000,000 |
Net long-term debt | $ 6,708,000,000 |  |  | 9,623,000,000 |
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
Four Point Six Two Five Percent Due in Two Thousand Twenty Three [Member] | Johnson Controls International plc [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.625% | 4.625% | 4.625% |  |
Debt instrument, face amount | $ 25,000,000 |  |  |  |
Long-term Debt | $ 26,000,000 |  |  | 37,000,000 |
Four Point Six Two Five Percent Due in Two Thousand Twenty Three [Member] | Tyco International Finance S.A. (TIFSA) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.625% | 4.625% | 4.625% |  |
Debt instrument, face amount | $ 7,000,000 |  |  |  |
Long-term Debt | $ 7,000,000 |  |  | 8,000,000 |
5.0 % Due in 2020 | Johnson Controls Inc. [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.00% | 5.00% | 5.00% |  |
Debt instrument, face amount | $ 47,000,000 |  |  |  |
Long-term Debt | $ 47,000,000 |  |  | 47,000,000 |
5.0 % Due in 2020 | Johnson Controls International plc [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.00% | 5.00% | 5.00% |  |
Debt instrument, face amount | $ 453,000,000 |  |  |  |
Long-term Debt | $ 453,000,000 |  |  | 452,000,000 |
Zero Point Zero Percent Due Two Thousand Twenty-One [Member] | Johnson Controls International plc [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 0.00% | 0.00% | 0.00% |  |
Debt instrument, face amount | € |  | € 750,000,000 |  |  |
Long-term Debt | $ 818,000,000 |  |  | 868,000,000 |
4.25% Due in 2021 | Johnson Controls Inc. [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.25% | 4.25% | 4.25% |  |
Debt instrument, face amount | $ 53,000,000 |  |  |  |
Long-term Debt | $ 53,000,000 |  |  | 53,000,000 |
4.25% Due in 2021 | Johnson Controls International plc [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.25% | 4.25% | 4.25% |  |
Debt instrument, face amount | $ 204,000,000 |  |  |  |
Long-term Debt | $ 204,000,000 |  |  | 446,000,000 |
3.75 % Due in 2022 | Johnson Controls Inc. [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.75% | 3.75% | 3.75% |  |
Debt instrument, face amount | $ 22,000,000 |  |  |  |
Long-term Debt | $ 22,000,000 |  |  | 22,000,000 |
3.75 % Due in 2022 | Johnson Controls International plc [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.75% | 3.75% | 3.75% |  |
Debt instrument, face amount | $ 171,000,000 |  |  |  |
Long-term Debt | $ 171,000,000 |  |  | 427,000,000 |
One Point Zero Percent Due Two Thousand Twenty Three | Johnson Controls International plc [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.00% | 1.00% | 1.00% |  |
Debt instrument, face amount | € |  | € 888,000,000 |  |  |
Long-term Debt | $ 967,000,000 |  |  | 1,154,000,000 |
Three Point Six Two Five Percent Due Two Thousand Twenty Four [Member] | Johnson Controls Inc. [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.625% | 3.625% | 3.625% |  |
Debt instrument, face amount | $ 31,000,000 |  |  |  |
Long-term Debt | $ 31,000,000 |  |  | 31,000,000 |
Three Point Six Two Five Percent Due Two Thousand Twenty Four [Member] | Johnson Controls International plc [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.625% | 3.625% | 3.625% |  |
Debt instrument, face amount | $ 453,000,000 |  |  |  |
Long-term Debt | $ 453,000,000 |  |  | 468,000,000 |
One Point Three Seven Five Percent Due in Two Thousand Twenty Five [Member] | Johnson Controls International plc [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.375% | 1.375% | 1.375% |  |
Debt instrument, face amount | € |  | € 423,000,000 |  |  |
Long-term Debt | $ 471,000,000 |  |  | 501,000,000 |
One Point Three Seven Five Percent Due in Two Thousand Twenty Five [Member] | Tyco International Finance S.A. (TIFSA) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.375% | 1.375% | 1.375% |  |
Debt instrument, face amount | € |  | € 54,000,000 |  |  |
Long-term Debt | $ 60,000,000 |  |  | 69,000,000 |
One Point Three Seven Five Percent Due in Two Thousand Twenty Five [Member] | Tyco International Holding S.a.r.L. (TSarL) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, face amount | € |  | € 215,000,000 |  |  |
Three Point Ninety Percent Due in Two Thousand Twenty Six [Member] | Johnson Controls International plc [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.90% | 3.90% | 3.90% |  |
Debt instrument, face amount | $ 487,000,000 |  |  |  |
Long-term Debt | $ 521,000,000 |  |  | 755,000,000 |
Three Point Ninety Percent Due in Two Thousand Twenty Six [Member] | Tyco International Finance S.A. (TIFSA) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.90% | 3.90% | 3.90% |  |
Debt instrument, face amount | $ 51,000,000 |  |  |  |
Long-term Debt | $ 51,000,000 |  |  | 52,000,000 |
Six Point Zero Percent Due Two Thousand Thirty Six [Member] | Johnson Controls Inc. [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.00% | 6.00% | 6.00% |  |
Debt instrument, face amount | $ 8,000,000 |  |  |  |
Long-term Debt | $ 8,000,000 |  |  | 8,000,000 |
Six Point Zero Percent Due Two Thousand Thirty Six [Member] | Johnson Controls International plc [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.00% | 6.00% | 6.00% |  |
Debt instrument, face amount | $ 342,000,000 |  |  |  |
Long-term Debt | $ 339,000,000 |  |  | 388,000,000 |
Five Point Seven Percent Due Two Thousand Forty One | Johnson Controls Inc. [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.70% | 5.70% | 5.70% |  |
Debt instrument, face amount | $ 30,000,000 |  |  |  |
Long-term Debt | $ 30,000,000 |  |  | 30,000,000 |
Five Point Seven Percent Due Two Thousand Forty One | Johnson Controls International plc [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.70% | 5.70% | 5.70% |  |
Debt instrument, face amount | $ 190,000,000 |  |  |  |
Long-term Debt | $ 189,000,000 |  |  | 269,000,000 |
Five Point Two Five Percent Due Two Thousand Forty Two | Johnson Controls Inc. [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.25% | 5.25% | 5.25% |  |
Debt instrument, face amount | $ 6,000,000 |  |  |  |
Long-term Debt | $ 6,000,000 |  |  | 8,000,000 |
Five Point Two Five Percent Due Two Thousand Forty Two | Johnson Controls International plc [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.25% | 5.25% | 5.25% |  |
Debt instrument, face amount | $ 155,000,000 |  |  |  |
Long-term Debt | $ 155,000,000 |  |  | 242,000,000 |
Four Point Six Two Five Percent Due Two Thousand Forty Four | Johnson Controls Inc. [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.625% | 4.625% | 4.625% |  |
Debt instrument, face amount | $ 6,000,000 |  |  |  |
Long-term Debt | $ 6,000,000 |  |  | 6,000,000 |
Four Point Six Two Five Percent Due Two Thousand Forty Four | Johnson Controls International plc [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.625% | 4.625% | 4.625% |  |
Debt instrument, face amount | $ 444,000,000 |  |  |  |
Long-term Debt | $ 441,000,000 |  |  | 441,000,000 |
Five Point One Two Five Percent Due in Two Thousand Forty Five [Member] | Johnson Controls International plc [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.125% | 5.125% | 5.125% |  |
Debt instrument, face amount | $ 477,000,000 |  |  |  |
Long-term Debt | $ 567,000,000 |  |  | 867,000,000 |
Five Point One Two Five Percent Due in Two Thousand Forty Five [Member] | Tyco International Finance S.A. (TIFSA) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.125% | 5.125% | 5.125% |  |
Debt instrument, face amount | $ 23,000,000 |  |  |  |
Long-term Debt | $ 22,000,000 |  |  | 23,000,000 |
Six Point Nine Five Percent Due Two Thousand Forty Six | Johnson Controls Inc. [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.95% | 6.95% | 6.95% |  |
Debt instrument, face amount | $ 4,000,000 |  |  |  |
Long-term Debt | $ 4,000,000 |  |  | 4,000,000 |
Six Point Nine Five Percent Due Two Thousand Forty Six | Johnson Controls International plc [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.95% | 6.95% | 6.95% |  |
Debt instrument, face amount | $ 32,000,000 |  |  |  |
Long-term Debt | $ 32,000,000 |  |  | 121,000,000 |
Four point five percent maturing in fiscal 2047 [Member] | Johnson Controls International plc [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.50% | 4.50% | 4.50% |  |
Debt instrument, face amount | $ 500,000,000 |  |  |  |
Long-term Debt | $ 496,000,000 |  |  | 496,000,000 |
Four Point Nine Five Percent Due Two Thousand Sixty Four [Member] | Johnson Controls Inc. [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.95% | 4.95% | 4.95% |  |
Debt instrument, face amount | $ 15,000,000 |  |  |  |
Long-term Debt | $ 15,000,000 |  |  | 15,000,000 |
Four Point Nine Five Percent Due Two Thousand Sixty Four [Member] | Johnson Controls International plc [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.95% | 4.95% | 4.95% |  |
Debt instrument, face amount | $ 341,000,000 |  |  |  |
Long-term Debt | $ 340,000,000 |  |  | 434,000,000 |
LIBOR plus One Point Two Five Percent Due in Two Thousand Twenty [Member] | Tyco International Holding S.a.r.L. (TSarL) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.25% | 1.25% | 1.25% |  |
Long-term Debt | $ 0 |  |  |  |
EURIBOR plus Zero Point Six Two Percent due in Two Thousand Twenty [Member] | Tyco International Holding S.a.r.L. (TSarL) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 0.62% | 0.62% | 0.62% |  |
Long-term Debt | $ 0 |  |  |  |
LIBOR JPY Plus Zero Point Four Two Percent Due in Two Thousand Twenty Two [Member] | Johnson Controls International plc [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 0.40% | 0.40% | 0.40% |  |
Debt instrument, face amount | ¥ |  |  | ¥ 25,000,000,000 |  |
Long-term Debt | $ 232,000,000 |  |  |  |
LIBOR JPY Plus Zero Point Four Two Percent Due in Two Thousand Twenty Two [Member] | Johnson Controls International plc [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt |  |  |  | 309,000,000 |
EURIBOR plus Zero Point Six Two Percent due in Two Thousand Twenty [Member] | Tyco International Holding S.a.r.L. (TSarL) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt |  |  |  | 250,000,000 |
LIBOR plus One Point Two Five Percent Due in Two Thousand Twenty [Member] | Tyco International Holding S.a.r.L. (TSarL) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt |  |  |  | $ 364,000,000 |

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