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Pension And Postretirement Benefits (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2014
Sep. 09, 2013
Pension And Postretirement Benefits        
Combined net pension and postretirement cost increase (decrease) $ (163)      
Net supplemental retirement pension benefits costs 29 27    
Net supplemental retirement pension benefits costs - interest cost 27 25    
Fair value of plan assets at end of period 9,222      
Pension Contribution Date       Sep. 09, 2013
Required contribution to our pension plans $ 140   $ 560  
Department Of Labor Published Proposed Exemption Voluntary Pension Contribution Date       Sep. 09, 2013