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v3.25.3

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 |

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