Postretirement Plans (Schedule Of Estimated Amount That Will Be Amortized From Accumulated Other Comprehensive Loss Into Net Periodic Benefit Cost) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Recognized net actuarial loss	$ 1,581
Amortization of prior service costs/(credits)	193
Total	1,774
Other Postretirement Benefits Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Recognized net actuarial loss	27
Amortization of prior service costs/(credits)	(134)
Total	$ (107)