Employee Benefit Plans (Schedule Of Estimated Benefits Expected To Be Paid) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Pension Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
2015	$ 653
2016	696
2017	737
2018	775
2019	812
Thereafter in the succeeding five years	4,545
Contributed to the other benefit plans	332	323
Approximate contribution expected to be paid	327
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2015	91
2016	96
2017	102
2018	109
2019	115
Thereafter in the succeeding five years	614
Contributed to the other benefit plans	57	145
Approximate contribution expected to be paid	61
Federal Subsidy [Member]
Defined Benefit Plan Disclosure [Line Items]
2015	(7)
2016	(8)
2017	(8)
2018	(9)
2019	(10)
Thereafter in the succeeding five years	$ (29)