Employee Benefit Plans And Other Postretirement Benefits (Schedule Of Pension Plans With PBO And ABO In Excess Of Fair value Of Plan Assets) (Details) (Pension Plan Assets [Member], USD $) In Billions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 benefit_plan
Pension Plan Assets [Member]
Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets [Abstract]
PBO	$ 2.02
Fair value of plan assets	$ 1.99
Number of plans	1
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Number of plans	1