Pension And Postretirement Benefits (Pension And Postretirement Benefit Costs Included In Operating Expenses) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Defined Benefit Plan Disclosure [Line Items]
Net (credit) cost	$ (33)	$ 130	$ (98)	$ 391
Pension Benefit Cost [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	282	331	846	991
Interest cost on benefit obligation	661	608	1,984	1,822
Expected return on assets	(849)	(828)	(2,549)	(2,484)
Amortization of prior service (credit)	(24)	(25)	(71)	(71)
Net (credit) cost	70	86	210	258
Postretirement Benefit Cost [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	59	95	175	286
Interest cost on benefit obligation	365	389	1,094	1,168
Expected return on assets	(165)	(177)	(491)	(533)
Amortization of prior service (credit)	(362)	(263)	(1,086)	(788)
Net (credit) cost	$ (103)	$ 44	$ (308)	$ 133