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Equity and Noncontrolling Interests - Equity Attributable to Johnson Controls and Noncontrolling Interests (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 20,036	$ 21,164	$ 20,874	$ 21,164	$ 20,447
Beginning balance		1,294		1,294
Beginning balance		22,458		22,458
Net income (loss) attributable to Johnson Controls	4,192		723	5,062	1,391
Foreign currency translation adjustments	(90)		(557)
Foreign currency translation adjustments	(94)		(614)	(95)	(331)
Realized and unrealized gains (losses) on derivatives	(9)		1	10	(10)
Realized and unrealized losses on marketable securities	0		0	0	(2)
Other comprehensive loss	(103)		(613)	(85)	(343)
Comprehensive income attributable to Johnson Controls	4,097		169	4,969	1,056
Comprehensive income attributable to noncontrolling interests	76		22	179	159
Total comprehensive income	4,173		191	5,148	1,215
Cash dividends - ordinary shares	(208)		(240)	(683)	(722)
Repurchases and retirements of ordinary shares	(4,122)			(5,122)
Repurchase of ordinary shares	87		56	1,087	255
Other, including options exercised	77		26	143	68
Ending balance	20,363		20,773	20,363	20,773
Ending balance	1,046			1,046
Ending balance	21,409			21,409
Equity Attributable to Johnson Controls
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	20,036	21,164	20,874	21,164	20,447
Net income (loss) attributable to Johnson Controls	4,192		723	5,062	1,391
Foreign currency translation adjustments	(90)		(557)		(331)
Foreign currency translation adjustments				(103)
Realized and unrealized gains (losses) on derivatives	(5)		3	10	(2)
Realized and unrealized losses on marketable securities				0	(2)
Other comprehensive income (loss)	(95)		(554)	(93)	(335)
Comprehensive income attributable to Johnson Controls	4,097		169	4,969	1,056
Cash dividends - ordinary shares	(208)		(240)	(683)	(722)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders				0	0
Repurchases and retirements of ordinary shares	(4,122)			(5,122)
Repurchase of ordinary shares			56		255
Change In noncontrolling interest share	0		0	0	0
Shareholders' equity, divestiture of Power Solutions	483			483
Divestiture of Power Solutions			0		0
Other, including options exercised	77		26	143	68
Ending balance	20,363		20,773	20,363	20,773
Equity Attributable to Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,265	1,294	1,006	1,294	920
Income attributable to noncontrolling interests	84		71	171	132
Foreign currency translation adjustments	(4)		(44)	8	3
Realized and unrealized gains on derivatives	(4)		(1)	0	1
Realized and unrealized gains on marketable securities				0	0
Other comprehensive income (loss)	(8)		(45)	8	4
Comprehensive income attributable to noncontrolling interests	76		26	179	136
Cash dividends - ordinary shares	0		0	0	0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders				(132)	(43)
Repurchase of ordinary shares	0		0	0	0
Change In noncontrolling interest share	0		4	0	23
Shareholders' equity, divestiture of Power Solutions	(295)			295
Divestiture of Power Solutions			0		0
Other, including options exercised	0		0	0	0
Ending balance	1,046		1,036	1,046	1,036
Total Equity Excluding Redeemable Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	21,301	22,458	21,880	22,458	21,367
Net income	4,276		794	5,233	1,523
Foreign currency translation adjustments	(94)		(601)	(95)	(328)
Realized and unrealized gains (losses) on derivatives	(9)		2	10	(1)
Realized and unrealized losses on marketable securities				0	(2)
Other comprehensive loss	(103)		(599)	(85)	(331)
Total comprehensive income	4,173		195	5,148	1,192
Cash dividends - ordinary shares	(208)		(240)	(683)	(722)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders				(132)	(43)
Repurchases and retirements of ordinary shares	(4,122)			(5,122)
Repurchase of ordinary shares			56		255
Change In noncontrolling interest share	0		4	0	23
Shareholders' equity, divestiture of Power Solutions	188			188
Divestiture of Power Solutions			0		0
Other, including options exercised	77		26	143	68
Ending balance	$ 21,409		$ 21,809	21,409	21,809
Accounting Standards Update 2016-09 [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect on Retained Earnings, Net of Tax					179
Accounting Standards Update 2016-09 [Member] | Equity Attributable to Johnson Controls
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect on Retained Earnings, Net of Tax				0	179
Accounting Standards Update 2016-09 [Member] | Equity Attributable to Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect on Retained Earnings, Net of Tax				0	0
Accounting Standards Update 2016-09 [Member] | Total Equity Excluding Redeemable Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect on Retained Earnings, Net of Tax				0	179
Accounting Standards Update 2016-16 [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect on Retained Earnings, Net of Tax				(546)
Accounting Standards Update 2016-16 [Member] | Equity Attributable to Johnson Controls
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect on Retained Earnings, Net of Tax		(546)		(546)	0
Accounting Standards Update 2016-16 [Member] | Equity Attributable to Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect on Retained Earnings, Net of Tax				0	0
Accounting Standards Update 2016-16 [Member] | Total Equity Excluding Redeemable Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect on Retained Earnings, Net of Tax				(546)	0
Accounting Standards Update 2014-09 [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect on Retained Earnings, Net of Tax				(45)
Accounting Standards Update 2014-09 [Member] | Equity Attributable to Johnson Controls
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect on Retained Earnings, Net of Tax		$ (45)		(45)	0
Accounting Standards Update 2014-09 [Member] | Equity Attributable to Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect on Retained Earnings, Net of Tax				0	0
Accounting Standards Update 2014-09 [Member] | Total Equity Excluding Redeemable Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect on Retained Earnings, Net of Tax				$ (45)	$ 0

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