Other Deductions, Net (Schedule Of Other Deductions, Net) (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2022	Mar. 31, 2021
Other deductions, net [Line Items]
Amortization of intangibles (intellectual property and customer relationships)	$ 62		$ 74		$ 125	$ 152
Restructuring costs	10		17		19	83
Other	(32)		(58)		(53)	(80)
Other deductions, net	40		33		91	$ 155
Change in gain (loss) from foreign currency exchange transactions	9				35
Gain (loss) from acquiring the remaining interest of an equity investment				$ 17
Gain (loss) from an investment sales				$ 21
Proceeds from Sale of Productive Assets		$ 15
Gain (loss) from sale of equity investment			$ 31
AspenTech [Member]
Other deductions, net [Line Items]
Acquisition/divestiture costs	$ 13				$ 36