Consolidated Statement of Equity Statement - USD ($) $ in Millions	Total	AspenTech	Common stock	Additional paid-in-capital	Retained earnings	Accumulated other comprehensive income (loss)	Treasury Stock, Common	Noncontrolling interests in subsidiaries
Beginning balance at Sep. 30, 2021				$ 522	$ 26,047	$ (872)	$ (16,291)	$ 40
Statement [Roll Forward]
Stock plans				70
Adjustments to Additional Paid in Capital, Other				(550)
Net earnings common stockholders	$ 2,491				2,491
Dividends paid (per share: $0.52, $0.515, $1.56 and $1.545 respectively)					(920)			(2)
Foreign currency translation	(319)					(317)
Pension and postretirement	(54)					54
Cash flow hedges	(17)					(17)
Purchases				0			(430)	0
Issued under stock plans							51
Net earnings								31
Stock compensation								15
Other comprehensive income	(282)							(2)
Ending balance at Jun. 30, 2022	$ 16,287		$ 477	42	27,618	(1,152)	(16,670)	5,972
Statement [Roll Forward]
Dividends paid	$ 1.545
AspenTech acquisition								5,890
Climate Technologies divestiture								0
Beginning balance at Sep. 30, 2021				522	26,047	(872)	(16,291)	40
Statement [Roll Forward]
Adjustments to Additional Paid in Capital, Other		$ 550
Ending balance at Sep. 30, 2022	$ 16,316			57	28,053	(1,485)	(16,738)	5,952
Beginning balance at Mar. 31, 2022				579	27,003	(957)	(16,527)	39
Statement [Roll Forward]
Stock plans				13
Adjustments to Additional Paid in Capital, Other				(550)
Net earnings common stockholders	921				921
Dividends paid (per share: $0.52, $0.515, $1.56 and $1.545 respectively)					(306)			(2)
Foreign currency translation	(187)					(186)
Pension and postretirement	(18)					18
Cash flow hedges	(27)					(27)
Purchases				0			(145)	0
Issued under stock plans							2
Net earnings								31
Stock compensation								15
Other comprehensive income	(196)							(1)
Ending balance at Jun. 30, 2022	$ 16,287		477	42	27,618	(1,152)	(16,670)	5,972
Statement [Roll Forward]
Dividends paid	$ 0.515
AspenTech acquisition								5,890
Climate Technologies divestiture								0
Common stockholders' equity	$ 10,315
Common stockholders' equity	10,364
Beginning balance at Sep. 30, 2022	16,316			57	28,053	(1,485)	(16,738)	5,952
Statement [Roll Forward]
Stock plans				111
Adjustments to Additional Paid in Capital, Other				0
Net earnings common stockholders	12,475				12,475
Dividends paid (per share: $0.52, $0.515, $1.56 and $1.545 respectively)					(904)			(1)
Foreign currency translation	437					432
Pension and postretirement	23					(23)
Cash flow hedges	4					4
Purchases				(56)			(2,000)	(44)
Issued under stock plans							61
Net earnings								(13)
Stock compensation								79
Other comprehensive income	418							5
Ending balance at Jun. 30, 2023	$ 26,413		477	112	39,624	(1,072)	(18,677)	5,949
Statement [Roll Forward]
Dividends paid	$ 1.56
AspenTech acquisition								0
Climate Technologies divestiture								(29)
Beginning balance at Mar. 31, 2023				138	30,571	(1,148)	(18,678)	5,987
Statement [Roll Forward]
Stock plans				30
Adjustments to Additional Paid in Capital, Other				0
Net earnings common stockholders	$ 9,352				9,352
Dividends paid (per share: $0.52, $0.515, $1.56 and $1.545 respectively)					(299)			(1)
Foreign currency translation	86					85
Pension and postretirement	(10)					10
Cash flow hedges	(19)					(19)
Purchases				(56)			0	(44)
Issued under stock plans							1
Net earnings								14
Stock compensation								21
Other comprehensive income	77							1
Ending balance at Jun. 30, 2023	$ 26,413		$ 477	$ 112	$ 39,624	$ (1,072)	$ (18,677)	5,949
Statement [Roll Forward]
Dividends paid	$ 0.52
AspenTech acquisition								0
Climate Technologies divestiture								$ (29)
Common stockholders' equity	$ 20,464