Benefit Plans (Schedule Of Components Of Net Periodic Pension Cost) (Details) (Pension [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 19	$ 18	$ 59	$ 56
Interest cost	86	88	258	263
Expected return on plan assets	(110)	(106)	(331)	(317)
Net loss	56	43	168	129
Prior service cost	3	3	8	10
Net periodic pension cost	$ 54	$ 46	$ 162	$ 141