TYCO INTERNATIONAL FINANCE S.A. TYCO INTERNATIONAL FINANCE S.A. Additional Information (Details) $ in Millions	12 Months Ended
Sep. 30, 2017 USD ($)
Subsidiary Issuer
Condensed Financial Statements, Captions [Line Items]
Quantifying Misstatement in Current Year Financial Statements, Amount	$ 1,485
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Quantifying Misstatement in Current Year Financial Statements, Amount	$ 263

Amount of each individual error being corrected in the correcting adjustment.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 1.N)
-URI http://asc.fasb.org/extlink&oid=26874127&loc=d3e30840-122693

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration