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Debt and Financing Arrangements Financing Arrangements (Details)		3 Months Ended					12 Months Ended
	Oct. 04, 2017 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2018 EUR (€)
Debt Instrument [Line Items]
Proceeds from Issuance of Unsecured Debt									$ 2,000,000,000
1.4% Due in 2018
Debt Instrument [Line Items]
Interest rate on notes		1.40%					1.40%			1.40%
Committed Five-year Credit Facility
Debt Instrument [Line Items]
Debt Instrument, Term						5 years
Amount Of Credit Facility Retired						$ 2,500,000,000			2,500,000,000
215 million EUR maturing in March 2020 [Member] | Floating Rate Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		$ 215,000,000					$ 215,000,000
Debt Instrument, Term		18 months
1.4% Due in 2018
Debt Instrument [Line Items]
Repayments of Debt					$ 300,000,000
750 million EUR maturing in December 2020 [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Debt					750,000,000
Contingent on consumation of Tyco merger [Domain] | 2.0 billion USD revolving credit facility [Domain]
Debt Instrument [Line Items]
Debt Instrument, Term						4 years
Line of Credit Facility, Maximum Borrowing Capacity						$ 2,000,000,000			2,000,000,000
Proceeds from Lines of Credit							0		0
Tyco International Holding S.a.r.L. (TSarL) [Member]
Debt Instrument [Line Items]
Long-term Debt						4,000,000,000			4,000,000,000
Repayments of Debt		$ 450,000,000	$ 400,000,000	$ 26,000,000	$ 1,900,000,000			$ 300,000,000
Tyco International Holding S.a.r.L. (TSarL) [Member] | LIBOR plus One Point Two Five Percent Due in Two Thousand Twenty [Member]
Debt Instrument [Line Items]
Long-term Debt						$ 4,000,000,000		3,700,000,000	$ 4,000,000,000
Johnson Controls International plc [Member] | Three Point Seven Five Percent Due in Two Thousand Eighteen [Member]
Debt Instrument [Line Items]
Long-term Debt		0					0	49,000,000
Debt instrument, face amount		$ 49,000,000					$ 49,000,000
Interest rate on notes		3.75%					3.75%			3.75%
Johnson Controls International plc [Member] | 1.4% Due in 2018
Debt Instrument [Line Items]
Long-term Debt		$ 0					$ 0	259,000,000
Debt instrument, face amount		$ 259,000,000					$ 259,000,000
Interest rate on notes		1.40%					1.40%			1.40%
Johnson Controls International plc [Member] | Three Point Six Two Five Percent Due Two Thousand Twenty Four [Member]
Debt Instrument [Line Items]
Long-term Debt		$ 468,000,000					$ 468,000,000	468,000,000
Debt instrument, face amount		$ 468,000,000					$ 468,000,000
Interest rate on notes		3.625%					3.625%			3.625%
Johnson Controls International plc [Member] | Four Point Nine Five Percent Due Two Thousand Sixty Four [Member]
Debt Instrument [Line Items]
Long-term Debt		$ 434,000,000					$ 434,000,000	434,000,000
Debt instrument, face amount		$ 435,000,000					$ 435,000,000
Interest rate on notes		4.95%					4.95%			4.95%
Johnson Controls International plc [Member] | Zero Point Zero Percent Due Two Thousand Twenty-One [Member]
Debt Instrument [Line Items]
Long-term Debt		$ 868,000,000					$ 868,000,000	$ 0
Debt instrument, face amount | €										€ 750,000,000
Interest rate on notes		0.00%					0.00%			0.00%
Johnson Controls International plc [Member] | Three Point Seven Five Percent Due 2018 [Member]
Debt Instrument [Line Items]
Repayments of Debt				$ 67,000,000
Floating Rate Term Loan [Member] | 250 million USD maturing in July 2019 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount		$ 250,000,000					$ 250,000,000
Debt Instrument, Term		364 days
Scott Safety business [Member] | Tyco International Holding S.a.r.L. (TSarL) [Member]
Debt Instrument [Line Items]
Repayments of Debt	$ 1,900,000,000
July 2018 [Member] | Tyco International Holding S.a.r.L. (TSarL) [Member]
Debt Instrument [Line Items]
Repayments of Debt		$ 250,000,000
September 2018 [Member] | Tyco International Holding S.a.r.L. (TSarL) [Member]
Debt Instrument [Line Items]
Repayments of Debt		$ 250,000,000

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