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Assets and Liabilities Held for Sale and Discontinued Operations - Narrative (Details) - USD ($) $ in Billions | Dec. 31, 2024 | Jul. 31, 2024
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Johnson Controls - Hitachi Air Conditioning Holding (UK) Ltd |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Ownership percentage | 60.00% |
Johnson Controls - Hitachi Air Conditioning Holding (UK) Ltd | Hitachi Global Life Solutions, Inc. |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Ownership percentage | 40.00% |
Residential and Light Commercial HVAC Business |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Proceeds from divestiture of businesses |  | $ 6.7
Residential and Light Commercial HVAC Business | Johnson Controls International PLC And Hitachi Global Life Solutions, Inc. |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Proceeds from divestiture of businesses |  | $ 8.1

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