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Equity and Noncontrolling Interests Equity Attributable to Johnson Controls and Noncontrolling Interests (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Oct. 01, 2020	Oct. 01, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 17,447	$ 19,766	$ 21,164
Beginning balance	1,086
Beginning balance	18,533
Adoption of ASU	18,753	18,533
Net income	1,637	631	5,674
Foreign currency translation adjustments	376	25	(342)
Realized and unrealized gains (losses) on derivatives	(18)	8	6
Pension and postretirement plans	4	8	(6)
Other comprehensive income (loss)	362	41	(342)
Comprehensive income attributable to Johnson Controls	1,979	650	5,350
Comprehensive income attributable to noncontrolling interests	253	186	195
Total comprehensive income	2,232	836	5,545
Cash dividends - ordinary shares	(771)	(780)	(887)
Repurchases and retirements of ordinary shares	(1,307)	(2,204)	(5,983)
Change in noncontrolling interest share	(8)	(83)
Other, including options exercised	$ (226)	$ (103)	$ (230)
Cash dividends ordinary, per share	$ 1.07	$ 1.04	$ 1.04
Ending balance	$ 17,562	$ 17,447	$ 19,766
Ending balance	1,191	1,086
Ending balance	18,753	18,533
Parent
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	17,447	19,766	21,164
Net income	1,637	631	5,674
Foreign currency translation adjustments	357	7	(325)
Realized and unrealized gains (losses) on derivatives	(19)	4	7
Pension and postretirement plans	4	8	(6)
Other comprehensive income (loss)	342	19	(324)
Comprehensive income attributable to Johnson Controls	1,979	650	5,350
Cash dividends - ordinary shares	(771)	(780)	(887)
Dividends attributable to noncontrolling interests	0	0	0
Repurchases and retirements of ordinary shares	(1,307)	(2,204)	(5,983)
Change in noncontrolling interest share	(8)	(83)
Other, including options exercised	226	103	230
Ending balance	17,562	17,447	19,766
Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,086	1,063	1,294
Net income	233	164	213
Foreign currency translation adjustments	19	18	(17)
Realized and unrealized gains (losses) on derivatives	1	4	(1)
Pension and postretirement plans	0	0	0
Other comprehensive income (loss)	20	22	(18)
Comprehensive income attributable to noncontrolling interests	253	186	195
Cash dividends - ordinary shares	0	0	0
Dividends attributable to noncontrolling interests	(142)	(114)	(132)
Repurchases and retirements of ordinary shares	0	0	0
Change in noncontrolling interest share	(6)	(49)
Other, including options exercised	0	0	1
Ending balance	1,191	1,086	1,063
Stockholders' Equity, Total
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	18,533	20,829	22,458
Adoption of ASU	18,753	18,533	20,829
Net Income	1,870	795	5,887
Foreign currency translation adjustments	376	25	(342)
Realized and unrealized gains (losses) on derivatives	(18)	8	6
Pension and postretirement plans	4	8	(6)
Other comprehensive income (loss)	362	41	(342)
Total comprehensive income	2,232	836	5,545
Cash dividends - ordinary shares	(771)	(780)	(887)
Dividends attributable to noncontrolling interests	(142)	(114)	(132)
Repurchases and retirements of ordinary shares	(1,307)	(2,204)	(5,983)
Change in noncontrolling interest share	(14)	(132)
Other, including options exercised	226	103	231
Ending balance	18,753	18,533	20,829
Power Solutions
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Realized and unrealized gains (losses) on derivatives	0	0	4
Divestiture of Power Solutions			(483)
Power Solutions | Parent
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Divestiture of Power Solutions			483
Power Solutions | Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Divestiture of Power Solutions			(295)
Power Solutions | Stockholders' Equity, Total
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Divestiture of Power Solutions			188
Adoption of ASC 606 | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			(45)
Adoption of ASC 606 | Parent | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			(45)
Adoption of ASC 606 | Noncontrolling Interest [Member] | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			0
Adoption of ASC 606 | Stockholders' Equity, Total | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		(45)	(45)
Adoption of ASU			(45)
Ending balance			(45)
Adoption of ASC 842 | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(5)
Ending balance		(5)
Adoption of ASC 842 | Parent | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		(5)
Ending balance			(5)
Adoption of ASC 842 | Noncontrolling Interest [Member] | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0	0
Ending balance		0	0
Adoption of ASC 842 | Stockholders' Equity, Total | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(4)	(5)
Adoption of ASU		(4)	(5)		$ (5)
Ending balance		(4)	(5)
Accounting Standards Update 2016-16 Member [Member] | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			(546)
Accounting Standards Update 2016-16 Member [Member] | Parent | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			(546)
Accounting Standards Update 2016-16 Member [Member] | Noncontrolling Interest [Member] | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			0
Accounting Standards Update 2016-16 Member [Member] | Stockholders' Equity, Total | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		(546)	(546)
Adoption of ASU			(546)
Ending balance			$ (546)
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(4)
Ending balance		(4)
Accounting Standards Update 2016-13 | Parent | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ (4)
Ending balance		$ (4)
Accounting Standards Update 2016-13 | Stockholders' Equity, Total | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of ASU				$ (4)

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