Other Deductions, Net (Schedule Of Other Deductions, Net) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Other deductions, net [Line Items]
Amortization of intangibles (intellectual property and customer relationships)	$ 78	$ 59
Restructuring costs	66	97
Special advisory fees	0	13
Other	(22)	9
Total	122	$ 178
Gain (loss) from an investment	21
Gain (loss) from acquiring the remaining interest of an equity investment	17
Change in pension expense (income)	(11)
Change in gain (loss) from foreign currency exchange transactions	(7)
Open Systems International Inc. [Member]
Other deductions, net [Line Items]
Acquisition-related fees	6
Open Systems International Inc. [Member] | Order or Production Backlog [Member]
Other deductions, net [Line Items]
Backlog amortization	$ 11