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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
Adoption of ASU	$ 19,766		$ 8		$ 16,812		$ 4,827		$ (1,086)		$ (795)
Adoption of ASU | Adoption of ASC 842		$ (5)		$ 0		$ 0		$ (5)		$ 0		$ 0
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	414		0		0		159		0		255
Cash dividends - ordinary shares	(201)		0		0		$ (201)		0		0
Cash dividends, Ordinary, Per share							$ 0.26
Repurchases and retirements of ordinary shares	(651)		0		0		$ (651)		0		0
Adoption of ASU	19,329		8		16,848		4,129		(1,116)		(540)
Adoption of ASU | Adoption of ASC 842		(5)		0		0		(5)		0		0
Other, including options exercised	6		0		36		0		(30)		0
Ending balance at Dec. 31, 2019	19,329		8		16,848		$ 4,129		(1,116)		(540)
Common Stock, Dividends, Per Share, Declared							$ 0.26
Adoption of ASU	19,329		8		16,848		$ 4,129		(1,116)		(540)
Adoption of ASU	17,447		8		16,865		2,469		(1,119)		(776)
Adoption of ASU | Accounting Standards Update 2016-13		(4)		0		0		(4)		0		0
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	723		0		0		451		0		272
Cash dividends - ordinary shares	(189)		0		0		$ (189)		0		0
Cash dividends, Ordinary, Per share							$ 0.26
Repurchases and retirements of ordinary shares	(346)		(1)		0		$ (345)		0		0
Adoption of ASU	17,447		7		16,917		2,382		(1,146)		(504)
Adoption of ASU | Accounting Standards Update 2016-13		$ (4)		$ 0		$ 0		$ (4)		$ 0		$ 0
Other, including options exercised	25		0		52		0		(27)		0
Ending balance at Dec. 31, 2020	17,656		7		16,917		$ 2,382		(1,146)		(504)
Common Stock, Dividends, Per Share, Declared							$ 0.26
Adoption of ASU	$ 17,656		$ 7		$ 16,917		$ 2,382		$ (1,146)		$ (504)

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