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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after accumulated amortization, of debt discount (premium).

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Amount of long-term debt and lease obligation, classified as noncurrent.

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Amount of long-term debt and lease obligation, classified as current.

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Amount of long-term debt and lease obligation, including portion classified as current.

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Amount of long-term debt classified as other.

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Debt and Financing Arrangements - Long-Term Debt (Details) € in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2025 EUR (€)	Sep. 30, 2024 USD ($)	Sep. 30, 2024 EUR (€)
Debt Instrument [Line Items]
Other	$ 57		$ 31
Long-term debt	9,195		8,568
Debt issuance costs	39		38
Net unamortized discount	38		38
Net purchase accounting adjustments	(39)		(48)
Total	9,157		8,540
Less: Current portion	566		536
Long-term debt	$ 8,591		8,004
3.90% Due In 2026 \| Johnson Controls International plc
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	3.90%	3.90%
Gross long-term debt	$ 487		487
3.90% Due In 2026 \| Tyco International Finance S.A. (TIFSA)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	3.90%	3.90%
Gross long-term debt	$ 51		51
5.50% Due In 2029 \| Johnson Controls International plc (JCI) and Tyco Fire & Security Finance S.C.A. (TFSCA)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	5.50%	5.50%
Gross long-term debt	$ 700		700
1.75% Due In 2030 \| Johnson Controls International plc (JCI) and Tyco Fire & Security Finance S.C.A. (TFSCA)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	1.75%	1.75%
Gross long-term debt	$ 625		625
2.00% Due In 2031 \| Johnson Controls International plc (JCI) and Tyco Fire & Security Finance S.C.A. (TFSCA)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	2.00%	2.00%
Gross long-term debt	$ 500		500
4.90% Due In 2033 \| Johnson Controls International plc (JCI) and Tyco Fire & Security Finance S.C.A. (TFSCA)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	4.90%	4.90%
Gross long-term debt	$ 650		400
6.00% Due In 2036 \| Johnson Controls International plc
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	6.00%	6.00%
Gross long-term debt	$ 342		342
6.00% Due In 2036 \| Johnson Controls Inc.
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	6.00%	6.00%
Gross long-term debt	$ 8		8
5.70% Due In 2041 \| Johnson Controls International plc
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	5.70%	5.70%
Gross long-term debt	$ 190		190
5.70% Due In 2041 \| Johnson Controls Inc.
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	5.70%	5.70%
Gross long-term debt	$ 30		30
5.25% Due In 2042 \| Johnson Controls International plc
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	5.25%	5.25%
Gross long-term debt	$ 155		155
5.25% Due In 2042 \| Johnson Controls Inc.
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	5.25%	5.25%
Gross long-term debt	$ 6		6
4.625% Due In 2044 \| Johnson Controls International plc
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	4.625%	4.625%
Gross long-term debt	$ 444		444
4.625% Due In 2044 \| Johnson Controls Inc.
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	4.625%	4.625%
Gross long-term debt	$ 6		6
5.125% Due In 2045 \| Johnson Controls International plc
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	5.125%	5.125%
Gross long-term debt	$ 246		253
5.125% Due In 2045 \| Tyco International Finance S.A. (TIFSA)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	5.125%	5.125%
Gross long-term debt	$ 23		23
6.95% Due In 2046 \| Johnson Controls International plc
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	6.95%	6.95%
Gross long-term debt	$ 32		32
6.95% Due In 2046 \| Johnson Controls International plc
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	6.95%	6.95%
Gross long-term debt	$ 4		4
4.50% Due In 2067 \| Johnson Controls International plc
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	4.50%	4.50%
Gross long-term debt	$ 500		500
4.95% Due In 2064 \| Johnson Controls International plc
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	4.95%	4.95%
Gross long-term debt	$ 341		341
4.95% Due In 2064 \| Johnson Controls International plc
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	4.95%	4.95%
Gross long-term debt	$ 15		$ 15
1.375% Due In 2025 \| Johnson Controls International plc
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			1.375%	1.375%
Gross long-term debt	0		$ 472
1.375% Due In 2025 \| Tyco International Finance S.A. (TIFSA)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			1.375%	1.375%
Gross long-term debt	$ 0		$ 60
EURIBOR Plus 0.75% Due In 2027 \| Johnson Controls International plc
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.75%
Gross long-term debt \| €		€ 176		€ 0
0.375% Due In 2027 \| Johnson Controls International plc (JCI) and Tyco Fire & Security Finance S.C.A. (TFSCA)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	0.375%	0.375%
Gross long-term debt	$ 587		559
3.00% Due In 2028 \| Johnson Controls International plc (JCI) and Tyco Fire & Security Finance S.C.A. (TFSCA)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	3.00%	3.00%
Gross long-term debt \| €		€ 704		670
1.00% Due In 2032 \| Johnson Controls International plc (JCI) and Tyco Fire & Security Finance S.C.A. (TFSCA)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	1.00%	1.00%
Gross long-term debt \| €		€ 587		559
3.125% Due In 2034 \| Johnson Controls International plc (JCI) and Tyco Fire & Security Finance S.C.A. (TFSCA)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	3.125%	3.125%
Gross long-term debt \| €		€ 587		0
4.25% Due In 2035 \| Johnson Controls International plc (JCI) and Tyco Fire & Security Finance S.C.A. (TFSCA)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	4.25%	4.25%
Gross long-term debt \| €		€ 939		€ 894
TORF JPY Plus 0.40% Due in 2027 \| Johnson Controls International plc
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.40%
Gross long-term debt	$ 203		$ 211