TYCO INTERNATIONAL FINANCE S.A. (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Condensed Income Statements, Captions [Line Items]
Net sales	$ 37,674	$ 37,179	$ 38,749
Cost of Goods and Services Sold	30,360	30,732	32,444
Gross Profit	7,314	6,447	6,305
Selling, General and Administrative Expense	(5,325)	(3,986)	(4,216)
Restructuring and impairment costs	(620)	(397)	(324)
Net Financing Charges	(314)	(288)	(244)
Equity income	531	375	395
Intercompany interest and fees	0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	1,586	2,151	1,916
Income tax provision	2,238	600	407
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	(652)	1,551	1,509
Income (loss) from discontinued operations, net of tax (Note 4)	0	128	(166)
Net income (loss)	(652)	1,679	1,343
Income from continuing operations attributable to noncontrolling interests	216	112	105
Income from discontinued operations attributable to noncontrolling interests	0	4	23
Net Income (Loss) Attributable to Parent	(868)	$ 1,563	$ 1,215
Consolidation, Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Net sales	0
Cost of Goods and Services Sold	0
Gross Profit	0
Selling, General and Administrative Expense	0
Restructuring and impairment costs	0
Net Financing Charges	0
Equity income	2,734
Intercompany interest and fees	0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	2,734
Income tax provision	0
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	2,734
Net income (loss)	2,734
Income from continuing operations attributable to noncontrolling interests	0
Net Income (Loss) Attributable to Parent	2,734
Tyco Fire & Security Finance SCA
Condensed Income Statements, Captions [Line Items]
Net sales	0
Cost of Goods and Services Sold	0
Gross Profit	0
Selling, General and Administrative Expense	(2)
Restructuring and impairment costs	0
Net Financing Charges	0
Equity income	(1,527)
Intercompany interest and fees	0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(1,529)
Income tax provision	0
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	(1,529)
Net income (loss)	(1,529)
Income from continuing operations attributable to noncontrolling interests	0
Net Income (Loss) Attributable to Parent	(1,529)
Johnson Controls International plc
Condensed Income Statements, Captions [Line Items]
Net sales	0
Cost of Goods and Services Sold	0
Gross Profit	0
Selling, General and Administrative Expense	(2)
Restructuring and impairment costs	0
Net Financing Charges	0
Equity income	(894)
Intercompany interest and fees	28
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(868)
Income tax provision	0
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	(868)
Net income (loss)	(868)
Income from continuing operations attributable to noncontrolling interests	0
Net Income (Loss) Attributable to Parent	(868)
Other Subsidiaries
Condensed Income Statements, Captions [Line Items]
Net sales	37,674
Cost of Goods and Services Sold	30,360
Gross Profit	7,314
Selling, General and Administrative Expense	(5,320)
Restructuring and impairment costs	(620)
Net Financing Charges	(308)
Equity income	531
Intercompany interest and fees	(35)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	1,562
Income tax provision	2,238
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	(676)
Net income (loss)	(676)
Income from continuing operations attributable to noncontrolling interests	216
Net Income (Loss) Attributable to Parent	(892)
Tyco International Finance S.A.
Condensed Income Statements, Captions [Line Items]
Net sales	0
Cost of Goods and Services Sold	0
Gross Profit	0
Selling, General and Administrative Expense	(1)
Restructuring and impairment costs	0
Net Financing Charges	(6)
Equity income	(313)
Intercompany interest and fees	7
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(313)
Income tax provision	0
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	(313)
Net income (loss)	(313)
Income from continuing operations attributable to noncontrolling interests	0
Net Income (Loss) Attributable to Parent	$ (313)