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Debt and Financing Arrangements Financing Arrangements (Details)	3 Months Ended	12 Months Ended
	Dec. 31, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2019 EUR (€)	Sep. 30, 2018 USD ($)
Debt Instrument [Line Items]
Proceeds from Issuance of Unsecured Debt		$ 2,000,000,000.0
Tyco International Holding S.a.r.L. (TSarL) [Member]
Debt Instrument [Line Items]
Long-term Debt		$ 4,000,000,000.0			$ 4,000,000,000.0
Repayments of Debt	$ 1,900,000,000
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					364,000,000
Johnson Controls International plc [Member] | Three Point Six Two Five Percent Due Two Thousand Twenty Four [Member]
Debt Instrument [Line Items]
Long-term Debt			$ 453,000,000		468,000,000
Debt instrument, face amount			$ 453,000,000
Interest rate on notes			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			$ 340,000,000		434,000,000
Debt instrument, face amount			$ 341,000,000
Interest rate on notes			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			$ 818,000,000		$ 868,000,000
Debt instrument, face amount | €				€ 750,000,000
Interest rate on notes			0.00%	0.00%

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