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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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