Benefit Plans (Schedule Of Components Of Net Periodic Pension Cost) (Details) (Pension Plan [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 22	$ 19	$ 65	$ 59
Interest cost	78	86	235	258
Expected return on plan assets	(123)	(110)	(370)	(331)
Net loss	67	56	203	168
Prior service cost	3	3	8	8
Net periodic pension cost	$ 47	$ 54	$ 141	$ 162