Benefit Plans (Schedule Of Components Of Net Periodic Pension Cost) (Details) (Pension Plans, Defined Benefit [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 22	$ 20	$ 43	$ 40
Interest cost	79	86	157	172
Expected return on plan assets	(124)	(110)	(247)	(221)
Net loss	67	56	136	112
Prior service cost	2	2	5	5
Net periodic pension cost	$ 46	$ 54	$ 94	$ 108