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Debt and Financing Arrangements Short-Term Debt (Details) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2018	Sep. 30, 2016	Sep. 30, 2017
Short-term Debt [Line Items]
Short-term Debt		$ 1,315,000,000		$ 1,214,000,000
Short-term Debt, Weighted Average Interest Rate, at Point in Time		2.80%		1.60%
Commercial Paper [Member]
Short-term Debt [Line Items]
Commercial Paper		$ 879,000,000		$ 954,000,000
Committed Five-year Credit Facility
Short-term Debt [Line Items]
Amount Of Credit Facility Retired	$ 2,500,000,000		$ 2,500,000,000
Debt Instrument, Term	5 years
Contingent on consumation of Tyco merger [Domain] | 2.0 billion USD revolving credit facility [Domain]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 2,000,000,000		2,000,000,000
Debt Instrument, Term	4 years
Proceeds from Lines of Credit		$ 0	0
Tyco International Holding S.a.r.L. (TSarL) [Member] | 1.0 billion USD revolving credit facility [Domain] [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,000,000,000		$ 1,000,000,000
Debt Instrument, Term	4 years

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