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Debt and Financing Arrangements - Narrative (Details) € in Millions, ¥ in Billions | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2022 USD ($) | Sep. 30, 2022 JPY (¥) | Mar. 31, 2022 USD ($) instrument | Nov. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2022 EUR (€) | Sep. 30, 2022 JPY (¥) | Mar. 31, 2022 EUR (€) | Nov. 30, 2021 EUR (€)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest paid |  |  |  |  | $ 226,000,000 | $ 242,000,000 | $ 247,000,000 |  |  |  |
Repayments of long-term debt |  |  |  |  | 184,000,000 | 507,000,000 | $ 1,386,000,000 |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt | $ 0 |  |  |  | 0 |  |  |  |  |  |
Term loans |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of debt instruments | instrument |  |  | 2 |  |  |  |  |  |  |  |
3.00 % Due in 2028 | Johnson Controls International plc (JCI) and Tyco Fire & Security Finance S.C.A. (TFSCA) |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt | 586,000,000 |  |  |  | 586,000,000 | 0 |  |  |  |  |
Debt instrument, face amount | $ 589,000,000 |  |  |  | $ 589,000,000 |  |  | € 600 |  |  |
Debt instrument, interest rate, stated percentage | 3.00% |  |  |  | 3.00% |  |  | 3.00% | 3.00% |  |
4.90% Due in 2032 | Johnson Controls International plc (JCI) and Tyco Fire & Security Finance S.C.A. (TFSCA) |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt | $ 394,000,000 |  |  |  | $ 394,000,000 | 0 |  |  |  |  |
Debt instrument, face amount | $ 400,000,000 |  |  |  | $ 400,000,000 |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 4.90% |  |  |  | 4.90% |  |  | 4.90% | 4.90% |  |
LIBOR JPY Plus 0.40% Due in 2022 | Johnson Controls International plc |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt | $ 0 |  |  |  | $ 0 | 223,000,000 |  |  |  |  |
Debt instrument, face amount | ¥ |  |  |  |  |  |  |  |  | ¥ 25 |  |
Repayments of long-term debt | $ 181,000,000 | ¥ 25 |  |  |  |  |  |  |  |  |
LIBOR JPY Plus 0.40% Due in 2022 | Johnson Controls International plc | London Interbank Offered Rate (LIBOR) JPY |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate | 0.40% | 0.40% |  |  | 0.40% |  |  |  |  |  |
LIBOR JPY Plus 0.40% Due in 2027 | Johnson Controls International plc |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt | $ 208,000,000 |  |  |  | $ 208,000,000 | $ 0 |  |  |  |  |
Debt instrument, face amount | $ 208,000,000 |  |  |  | $ 208,000,000 |  |  |  | ¥ 30 |  |
LIBOR JPY Plus 0.40% Due in 2027 | Johnson Controls International plc | Tokyo Term Risk Free Rate (TORF) |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate | 0.40% | 0.40% |  |  | 0.40% |  |  |  |  |  |
$2.5 Billion Facility Expiring Dec 2024 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 2,500,000,000 |  |  |  | $ 2,500,000,000 |  |  |  |  |  |
$500 Million Facility Expiring Dec 2021 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 500,000,000 |  |  |  | $ 500,000,000 |  |  |  |  |  |
Bank Term Loan Due October 2022 | Term loans |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 196,000,000 |  |  |  |  |  |  | € 200
Bank Term Loan Due October 2022 | Euro Interbank Offered Rate (EURIBOR) | Term loans |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  | 0.50% |  |  |  |  |  |  |
Bank Term Loans Due March 2023 | Term loans |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 280,000,000 |  |  |  |  |  |  | € 285 |
Bank Term Loans Due March 2023 | Euro Interbank Offered Rate (EURIBOR) | Term loans |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  | 0.50% |  |  |  |  |  |  |  |

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