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Employee Benefit Plans (Schedule Of Estimated Benefits Expected To Be Paid) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Pension Plans Defined Benefit [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
2013 $ 581  
2014 618  
2015 656  
2016 695  
2017 732  
2018-2022 4,172  
Other Benefits [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
2013 108  
2014 112  
2015 115  
2016 119  
2017 124  
2018-2022 662  
Contributed to the other benefit plans 149 137
Approximate contribution expected to be paid 109  
Federal Subsidy [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
2013 (6)  
2014 (7)  
2015 (7)  
2016 (8)  
2017 (8)  
2018-2022 (42)  
Pensions Benefits Member
   
Defined Benefit Plan Disclosure [Line Items]    
Contributed to the other benefit plans 282  
Approximate contribution expected to be paid $ 327