Pension And Postretirement Plan Expenses (Summary Of Net Periodic Pension And Net Postretirement Plan Expenses) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Pension And Postretirement Plan Expenses [Line Items]
Service cost	$ 24	$ 26
Interest cost	62	56
Expected return on plan assets	(86)	(83)
Net amortization	36	58
Total	$ 36	$ 57