Pension & Postretirement Expenses (Schedule Of Net Periodic Pension And Net Postretirement Plan Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Pension And Postretirement Plan Expenses [Line Items]
Service cost	$ 18	$ 19	$ 54	$ 57
Interest cost	49	46	149	139
Expected return on plan assets	(88)	(87)	(264)	(262)
Net amortization	17	30	50	91
Total	$ (4)	$ 8	$ (11)	$ 25