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Consolidated Statements of Shareholders' Equity Attributable to Johnson Controls Ordinary Shareholders Consolidated Statements of Shareholders' Equity Attributable to Johnson Controls Ordinary Shareholders - USD ($) $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Ordinary Shares	Ordinary Shares Cumulative Effect, Period of Adoption, Adjustment	Capital in excess of par value	Capital in excess of par value Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Treasury Stock, at Cost	Treasury Stock, at Cost Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss Cumulative Effect, Period of Adoption, Adjustment
Beginning balance at Sep. 30, 2019	$ 19,766		$ 8		$ 16,812		$ 4,827		$ (1,086)		$ (795)
Beginning balance (Adoption of ASC 842) at Sep. 30, 2019		$ (5)		$ 0		$ 0		$ (5)		$ 0		$ 0
Comprehensive income (loss)	42		0		0		190		0		(148)
Cash dividends - ordinary shares	(590)		0		0		$ (590)		0		0
Cash dividends, Ordinary, Per share							$ 0.78
Repurchases and retirements of ordinary shares	(1,467)		0		0		$ (1,467)		0		0
Other, including options exercised	59		0		92		0		(33)		0
Ending balance at Jun. 30, 2020	17,805		8		16,904		2,955		(1,119)		(943)
Beginning balance at Mar. 31, 2020	18,084		8		16,883		3,332		(1,118)		(1,021)
Comprehensive income (loss)	(104)		0		0		(182)		0		78
Cash dividends - ordinary shares	(195)		0		0		$ (195)		0		0
Cash dividends, Ordinary, Per share							$ 0.26
Other, including options exercised	20		0		21		$ 0		(1)		0
Ending balance at Jun. 30, 2020	17,805		8		16,904		2,955		(1,119)		(943)
Beginning balance at Sep. 30, 2020	17,447		8		16,865		2,469		(1,119)		(776)
Beginning balance (Accounting Standards Update 2016-13) at Sep. 30, 2020		$ (4)		$ 0		$ 0		$ (4)		$ 0		$ 0
Comprehensive income (loss)	1,793		0		0		1,368		0		425
Cash dividends - ordinary shares	(577)		0		0		$ (577)		0		0
Cash dividends, Ordinary, Per share							$ 0.80
Repurchases and retirements of ordinary shares	(1,001)		(1)		0		$ (1,000)		0		0
Change in noncontrolling interest share	(8)		0		(8)		0		0		0
Other, including options exercised	190		0		220		0		(30)		0
Ending balance at Jun. 30, 2021	17,840		7		17,077		2,256		(1,149)		(351)
Beginning balance at Mar. 31, 2021	17,698		7		17,034		2,215		(1,148)		(410)
Comprehensive income (loss)	633		0		0		574		0		59
Cash dividends - ordinary shares	(193)		0		0		$ (193)		0		0
Cash dividends, Ordinary, Per share							$ 0.27
Repurchases and retirements of ordinary shares	(340)		0		0		$ (340)		0		0
Other, including options exercised	42		0		43		0		(1)		0
Ending balance at Jun. 30, 2021	$ 17,840		$ 7		$ 17,077		$ 2,256		$ (1,149)		$ (351)

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Aggregate dividends declared during the period for each share of common stock outstanding.

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