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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, 2012
Pension Plans [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Recognized net actuarial loss $ 2,272
Amortization of prior service costs/(credits) 195
Total 2,467
Other Postretirement Benefits Plans [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Recognized net actuarial loss 102
Amortization of prior service costs/(credits) (180)
Total $ (78)