Consolidated Statements of Financial Position $ in Millions	Sep. 30, 2020 USD ($) $ / shares shares	Sep. 30, 2020 € / shares	Sep. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2019 € / shares
Assets
Cash and cash equivalents	$ 1,951		$ 2,805
Accounts receivable, less allowance for doubtful accounts of $173 and $173, respectively	5,294		5,770
Inventories	1,773		1,814
Assets held for sale	0		98
Other current assets	1,035		1,906
Current assets	10,053		12,393
Property, plant and equipment - net	3,059		3,348
Goodwill	17,932		18,178
Other intangible assets - net	5,356		5,632
Investments in partially-owned affiliates	914		853
Noncurrent assets held for sale	147		60
Other noncurrent assets	3,354		1,823
Total assets	40,815		42,287
Liabilities and Equity
Short-term debt	31		10
Current portion of long-term debt	262		501
Accounts payable	3,120		3,582
Accrued compensation and benefits	838		953
Deferred revenue	1,435		1,407
Liabilities held for sale	0		44
Other current liabilities	2,562		2,573
Current liabilities	8,248		9,070
Long-term debt	7,526		6,708
Pension and postretirement benefits	1,140		1,044
Other noncurrent liabilities	5,368		4,636
Long-term liabilities	14,034		12,388
Ordinary shares	8		8
Ordinary A shares	0		0
Preferred shares	0		0
Ordinary shares held in treasury, at cost (2020 - 27,684,632; 2019 - 26,864,793 shares)	(1,119)		(1,086)
Capital in excess of par value	16,865		16,812
Retained earnings	2,469		4,827
Accumulated other comprehensive loss	(776)		(795)
Shareholders’ equity attributable to Johnson Controls	17,447		19,766
Noncontrolling interests	1,086		1,063
Total equity	18,533		20,829
Total liabilities and equity	40,815		42,287
Allowance for doubtful accounts	$ 173		$ 173
Preferred shares, par or stated value per share | $ / shares	$ 0.01		$ 0.01
Preferred shares authorized | shares	200,000,000		200,000,000
Preferred shares issued | shares	0		0
Ordinary shares held in treasury, at cost | shares	27,684,632		26,864,793
Allowance for doubtful accounts	$ 173		$ 173
Ordinary shares, par value | $ / shares	$ 0.01		$ 0.01
Ordinary shares authorized | shares	2,000,000,000.0		2,000,000,000.0
Ordinary shares issued | shares	753,907,315		804,495,430
Preferred shares authorized | shares	200,000,000		200,000,000
Preferred shares issued | shares	0		0
Preferred shares, par or stated value per share | $ / shares	$ 0.01		$ 0.01
Ordinary shares held in treasury, at cost | shares	27,684,632		26,864,793
Common Class A [Member]
Ordinary shares, par value | € / shares		€ 1.00		€ 1.00
Ordinary shares authorized | shares	40,000		40,000
Ordinary shares issued | shares	0		0