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Debt and Financing Arrangements Financing Arrangements (Details) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2021 EUR (€) | Sep. 30, 2021 EUR (€)
Notes 3.750 Percent Due 2021 [Domain] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of Debt | $ 193,000,000 |  |
Interest rate on notes | 3.75% |  | 3.75%
Bank term loan due March 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of Debt | € |  | € 200,000,000 |
Notes 4.250 Percent Due 2021 [Domain] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of Debt | $ 257,000,000 |  |
Interest rate on notes | 4.25% |  | 4.25%
Notes 1.000 Percent Due 2023 [Domain] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of Debt | € |  | € 43,000,000 |
Interest rate on notes | 1.00% |  | 1.00%
Johnson Controls International plc [Member] | Three Point Six Two Five Percent Due Two Thousand Twenty Four [Member] |  |  |
Debt Instrument [Line Items] |  |  |
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] |  |  |
Debt instrument, face amount | $ 341,000,000 |  |
Interest rate on notes | 4.95% |  | 4.95%
Johnson Controls International plc (JCI) and Tyco Fire & Security Finance S.C.A. (TFSCA) | Zero Point Three Seven Five Percent Due Two Thousand Twenty Seven |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, face amount | € |  |  | € 500,000,000
Interest rate on notes | 0.375% |  | 0.375%
Johnson Controls International plc (JCI) and Tyco Fire & Security Finance S.C.A. (TFSCA) | One Point Zero Percent Due Two Thousand Thirty Two |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, face amount | € |  |  | € 500,000,000
Interest rate on notes | 1.00% |  | 1.00%
Johnson Controls International plc (JCI) and Tyco Fire & Security Finance S.C.A. (TFSCA) | One Point Seven Five Percent Due Two Thousand Thirty |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, face amount | $ 625,000,000 |  |
Interest rate on notes | 1.75% |  | 1.75%
Johnson Controls International plc (JCI) and Tyco Fire & Security Finance S.C.A. (TFSCA) | Two Point Zero Percent Due Two Thousand Thirty One |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, face amount | $ 500,000,000 |  |
Interest rate on notes | 2.00% |  | 2.00%
Debt Instrument, Interest Rate Increase, Condition 1 Not Met | 0.125% | 0.125% |
Debt Instrument, Interest Rate Increase, Condition 2 Not Met | 0.125% | 0.125% |

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