Other Deductions, Net (Schedule Of Other Deductions, Net) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Other deductions, net [Line Items]
Amortization of intangibles (intellectual property and customer relationships)	$ 71	$ 60	$ 223	$ 178
Restructuring costs	28	88	111	216
Special advisory fees	0	0	0	13
Other	(11)	33	(91)	(6)
Other deductions, net	88	$ 181	243	$ 401
Change in gain (loss) from foreign currency exchange transactions	25
Gain (loss) from an investment			21
Gain (loss) from acquiring the remaining interest of an equity investment			17
Gain (loss) from sale of equity investment			31
Open Systems International Inc. [Member] | Order or Production Backlog [Member]
Other deductions, net [Line Items]
Backlog amortization	$ 7		$ 24