Consolidated Statements Of Equity - USD ($) $ in Millions	Total	AspenTech [Member]	Common stock	Additional paid-in-capital	Retained earnings	Accumulated other comprehensive income (loss)	Treasury stock	Noncontrolling interests in subsidiaries
Stockholders' equity, Beginning balance at Sep. 30, 2019				$ 393	$ 24,199	$ (1,722)	$ (15,114)	$ 40
Statement [Roll Forward]
Stock plans				77
Adjustments to Additional Paid in Capital, Other				0
Net earnings common stockholders	$ 1,965				1,965
Dividends paid (per share)	$ 2.00
Dividends paid (per share: 2022, $2.06; 2021, $2.02; 2020, $2.00)					(1,209)			(25)
Adoption of new accounting standards					0
Foreign currency translation	$ 85					83
Pension and postretirement	64					64
Cash flow hedges	(2)					(2)
Purchases							(942)
Issued under stock plans							136
Net earnings								25
Stock Compensation	110							0
Other comprehensive income (loss)	147							2
Heritage AspenTech acquisition								0
Stockholders' equity, Ending balance at Sep. 30, 2020	8,447		$ 477	470	24,955	(1,577)	(15,920)	42
Statement [Roll Forward]
Common stockholders' equity	8,405
Stock plans				52
Adjustments to Additional Paid in Capital, Other				0
Net earnings common stockholders	$ 2,303				2,303
Dividends paid (per share)	$ 2.02
Dividends paid (per share: 2022, $2.06; 2021, $2.02; 2020, $2.00)					(1,210)			(25)
Adoption of new accounting standards					(1)
Foreign currency translation	$ 81					82
Pension and postretirement	605					605
Cash flow hedges	18					18
Purchases							(500)
Issued under stock plans							129
Net earnings								24
Stock Compensation	224							0
Other comprehensive income (loss)	704							(1)
Heritage AspenTech acquisition								0
Stockholders' equity, Ending balance at Sep. 30, 2021	9,923		477	522	26,047	(872)	(16,291)	40
Statement [Roll Forward]
Common stockholders' equity	9,883
Stock plans				85
Adjustments to Additional Paid in Capital, Other		$ 550		(550)
Net earnings common stockholders	$ 3,231				3,231
Dividends paid (per share)	$ 2.06
Dividends paid (per share: 2022, $2.06; 2021, $2.02; 2020, $2.00)					(1,225)			(4)
Adoption of new accounting standards					0
Foreign currency translation	$ (644)					(636)
Pension and postretirement	37					37
Cash flow hedges	(14)					(14)
Purchases							(500)
Issued under stock plans							53
Net earnings								(1)
Stock Compensation	144							35
Other comprehensive income (loss)	(621)							(8)
Heritage AspenTech acquisition								5,890
Stockholders' equity, Ending balance at Sep. 30, 2022	16,316		$ 477	$ 57	$ 28,053	$ (1,485)	$ (16,738)	$ 5,952
Statement [Roll Forward]
Common stockholders' equity	$ 10,364