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Assets and Liabilities Held for Sale and Discontinued Operations - Narrative (Details) - USD ($) $ in Billions	Dec. 31, 2024	Jul. 31, 2024
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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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

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