Benefit Plans (Schedule Of Components Of Net Periodic Pension Cost) (Details) (Pension [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 20	$ 19	$ 40	$ 38
Interest cost	86	88	172	175
Expected return on plan assets	(110)	(105)	(221)	(211)
Net loss	56	43	112	86
Prior service cost	2	3	5	7
Net periodic pension cost	$ 54	$ 48	$ 108	$ 95