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Subsequent Events (Details) - Subsequent Event - USD ($) $ in Billions	3 Months Ended
	Sep. 30, 2025	Jul. 23, 2024
Johnson Controls - Hitachi Air Conditioning Holding (UK) Ltd
Subsequent Event [Line Items]
Ownership percentage		60.00%
Residential and Light Commercial HVAC Business
Subsequent Event [Line Items]
Proceeds from divestiture of businesses		$ 6.7
Residential and Light Commercial HVAC Business | Forecast
Subsequent Event [Line Items]
Net proceeds	$ 5.0
Hitachi Global Life Solutions, Inc. | Johnson Controls - Hitachi Air Conditioning Holding (UK) Ltd
Subsequent Event [Line Items]
Ownership percentage		40.00%
Johnson Controls International PLC And Hitachi Global Life Solutions, Inc. | Residential and Light Commercial HVAC Business
Subsequent Event [Line Items]
Proceeds from divestiture of businesses		$ 8.1

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- Definition

Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

+ References

No definition available.

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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
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- Definition

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+ References

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-Topic 230
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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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