Document and Entity Information
| Document and Entity Information | Jun. 04, 2024 |
| Document And Entity Information [Line Items] | |
| Amendment Flag | false |
| Entity Central Index Key | 0000833444 |
| Document Type | 8-K |
| Document Period End Date | Jun. 04, 2024 |
| Entity Registrant Name | JOHNSON CONTROLS INTERNATIONAL PLC |
| Entity Incorporation State Country Code | L2 |
| Entity File Number | 001-13836 |
| Entity Tax Identification Number | 98-0390500 |
| Entity Address, Address Line One | One Albert Quay |
| Entity Address, City or Town | Cork |
| Entity Address, Country | IE |
| Entity Address, Postal Zip Code | T12 X8N6 |
| City Area Code | (353) |
| Local Phone Number | 21-423-5000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Ordinary Shares Par Value 0.01 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Ordinary Shares, Par Value $0.01 |
| Trading Symbol | JCI |
| Security Exchange Name | NYSE |
| Notes 3.625 Percent Due 2024 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 3.625% Senior Notes due 2024 |
| Trading Symbol | JCI24A |
| Security Exchange Name | NYSE |
| Notes 1.375 Percent Due 2025 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 1.375% Notes due 2025 |
| Trading Symbol | JCI25A |
| Security Exchange Name | NYSE |
| Notes 3.900 Percent Due 2026 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 3.900% Notes due 2026 |
| Trading Symbol | JCI26A |
| Security Exchange Name | NYSE |
| Notes 0375 Percent Due 2027 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 0.375% Senior Notes due 2027 |
| Trading Symbol | JCI27 |
| Security Exchange Name | NYSE |
| Notes 3000 Percent Due 2028 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 3.000% Senior Notes due 2028 |
| Trading Symbol | JCI28 |
| Security Exchange Name | NYSE |
| Notes 5.500 Percent Due 2029 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 5.500% Senior Notes due 2029 |
| Trading Symbol | JCI29 |
| Security Exchange Name | NYSE |
| Notes 1750 Percent Due 2030 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 1.750% Senior Notes due 2030 |
| Trading Symbol | JCI30 |
| Security Exchange Name | NYSE |
| Sustainability Linked Notes 2000 Due 2031 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 2.000% Sustainability-Linked Senior Notes due 2031 |
| Trading Symbol | JCI31 |
| Security Exchange Name | NYSE |
| M 1.000 Senior Notes Due 20322 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 1.000% Senior Notes due 2032 |
| Trading Symbol | JCI32 |
| Security Exchange Name | NYSE |
| M 4.900 Senior Notes Due 20321 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 4.900% Senior Notes due 2032 |
| Trading Symbol | JCI32A |
| Security Exchange Name | NYSE |
| Notes 4250 Percent Due 2035 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 4.250% Senior Notes due 2035 |
| Trading Symbol | JCI35 |
| Security Exchange Name | NYSE |
| Notes 6.000 Percent Due 2036 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 6.000% Notes due 2036 |
| Trading Symbol | JCI36A |
| Security Exchange Name | NYSE |
| M 5.70 Senior Notes Due 20414 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 5.70% Senior Notes due 2041 |
| Trading Symbol | JCI41B |
| Security Exchange Name | NYSE |
| M 5.250 Senior Notes Due 20413 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 5.250% Senior Notes due 2041 |
| Trading Symbol | JCI41C |
| Security Exchange Name | NYSE |
| Notes 4.625 Percentdue 2044 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 4.625% Senior Notes due 2044 |
| Trading Symbol | JCI44A |
| Security Exchange Name | NYSE |
| Notes 5.125 Percent Due 2045 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 5.125% Notes due 2045 |
| Trading Symbol | JCI45B |
| Security Exchange Name | NYSE |
| Debentures 6.950 Percent Due December 12045 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 6.950% Debentures due December 1, 2045 |
| Trading Symbol | JCI45A |
| Security Exchange Name | NYSE |
| Notes 4.500 Percent Due 2047 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 4.500% Senior Notes due 2047 |
| Trading Symbol | JCI47 |
| Security Exchange Name | NYSE |
| Notes 4.950 Percent Due 2064 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 4.950% Senior Notes due 2064 |
| Trading Symbol | JCI64A |
| Security Exchange Name | NYSE |