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Equity and Noncontrolling Interests - Equity Attributable to Johnson Controls and Noncontrolling Interests (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 19,766	$ 21,164
Beginning balance	1,063
Beginning balance	20,829
Net income (loss) attributable to Johnson Controls	159	355
Foreign currency translation adjustments	251	(127)
Foreign currency translation adjustments	261	(118)
Realized and unrealized gains on derivatives	7	2
Pension and postretirement plans	(1)	0
Other comprehensive income (loss)	267	(116)
Comprehensive income attributable to Johnson Controls	414	229
Comprehensive income attributable to noncontrolling interests	44	54
Total comprehensive income	458	283
Cash dividends - ordinary shares	(201)	(240)
Stock Repurchased and Retired During Period, Value	(651)
Repurchases and retirements of ordinary shares		(467)
Other, including options exercised	6	7
Ending balance	19,329	20,102
Ending balance	1,102
Ending balance	20,431
Equity Attributable to Johnson Controls
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	19,766	21,164
Net income (loss) attributable to Johnson Controls	159	355
Foreign currency translation adjustments	251	(127)
Realized and unrealized gains on derivatives	5	1
Pension and postretirement plans	(1)	0
Other comprehensive income (loss)	255	(126)
Comprehensive income attributable to Johnson Controls	414	229
Cash dividends - ordinary shares	(201)	(240)
Dividends attributable to noncontrolling interests	0	0
Stock Repurchased and Retired During Period, Value	(651)
Repurchases and retirements of ordinary shares		(467)
Other, including options exercised	6	7
Ending balance	19,329	20,102
Equity Attributable to Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,063	1,294
Income attributable to noncontrolling interests	32	44
Foreign currency translation adjustments	10	9
Realized and unrealized gains on derivatives	2	1
Pension and postretirement plans	0	0
Other comprehensive income (loss)	12	10
Comprehensive income attributable to noncontrolling interests	44	54
Cash dividends - ordinary shares	0	0
Dividends attributable to noncontrolling interests	(5)	(43)
Stock Repurchased and Retired During Period, Value	0
Repurchases and retirements of ordinary shares		0
Other, including options exercised	0	0
Ending balance	1,102	1,305
Total Equity Excluding Redeemable Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	20,829	22,458
Net income	191	399
Foreign currency translation adjustments	261	(118)
Realized and unrealized gains on derivatives	7	2
Pension and postretirement plans	(1)	0
Other comprehensive income (loss)	267	(116)
Total comprehensive income	458	283
Cash dividends - ordinary shares	(201)	(240)
Dividends attributable to noncontrolling interests	(5)	(43)
Stock Repurchased and Retired During Period, Value	(651)
Repurchases and retirements of ordinary shares		(467)
Other, including options exercised	6	7
Ending balance	20,431	21,407
Adoption of ASC 606
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect on Retained Earnings, Net of Tax		(45)
Adoption of ASC 606 | Equity Attributable to Johnson Controls
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect on Retained Earnings, Net of Tax	0	(45)
Adoption of ASC 606 | Equity Attributable to Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect on Retained Earnings, Net of Tax	0	0
Adoption of ASC 606 | Total Equity Excluding Redeemable Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect on Retained Earnings, Net of Tax	0	(45)
Adoption of ASU 2016-16
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect on Retained Earnings, Net of Tax		(546)
Adoption of ASU 2016-16 | Equity Attributable to Johnson Controls
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect on Retained Earnings, Net of Tax	0	(546)
Adoption of ASU 2016-16 | Equity Attributable to Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect on Retained Earnings, Net of Tax	0	0
Adoption of ASU 2016-16 | Total Equity Excluding Redeemable Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect on Retained Earnings, Net of Tax	0	(546)
Adoption of ASC 842
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect on Retained Earnings, Net of Tax	(5)
Adoption of ASC 842 | Equity Attributable to Johnson Controls
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect on Retained Earnings, Net of Tax	(5)	0
Adoption of ASC 842 | Equity Attributable to Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect on Retained Earnings, Net of Tax	0	0
Adoption of ASC 842 | Total Equity Excluding Redeemable Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect on Retained Earnings, Net of Tax	$ (5)	$ 0

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