Income Taxes (Schedule Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Period over which the amount of unrecognized tax benefits are not expected to significantly increase or decrease	12 months
Unrecognized tax benefits, beginning	$ 219	$ 195
Additions for current year tax positions	25	27
Additions for prior year tax positions	9	17
Reductions for prior year tax positions	(65)	(6)
Acquisitions and divestitures	1	1
Reductions for settlements with tax authorities	0	(5)
Reductions for expiration of statutes of limitations	(11)	(10)
Unrecognized tax benefits, ending	$ 178	$ 219