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Retirement Plans (Reconciliation Of Benefit Obligations And Plan Or Trust Assets And Resulting Funded Status Of Defined Benefit Retirement Plans) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Pension Benefits
     
Change in Benefit Obligation      
Service cost $ (298) $ (266) $ (245)
Interest cost (492) (523) (517)
Other Postretirement Benefit Plans, Defined Benefit
     
Change in Benefit Obligation      
Service cost (15) (12) (13)
Interest cost (53) (59) (62)
Change in Benefit Obligation [Member] | Pension Benefits
     
Change in Benefit Obligation      
Benefit obligation at beginning of year (12,114) (10,242)  
Service cost (298) (266)  
Interest cost (492) (523)  
Amendments 234 0  
Actuarial loss 1,094 (1,527)  
Settlement/curtailment/other 2 (7)  
Benefits paid 561 451  
Benefit obligation at end of year (11,013) (12,114)  
Change in Benefit Obligation [Member] | Other Postretirement Benefit Plans, Defined Benefit
     
Change in Benefit Obligation      
Benefit obligation at beginning of year (1,384) (1,179)  
Service cost (15) (12)  
Interest cost (53) (59)  
Amendments 0 0  
Actuarial loss 177 (211)  
Settlement/curtailment/other 11 (5)  
Benefits paid 81 82  
Benefit obligation at end of year (1,183) (1,384)  
Change in Plan/Trust Assets [Member] | Pension Benefits
     
Change in Plan/Trust Assets      
Fair value of assets at beginning of year 7,227 6,250  
Actual return on plan assets 1,200 874  
Employer contributions 601 532  
Settlement/curtailment/other (3) 12  
Benefits paid (549) (441)  
Fair value of assets at end of year 8,476 7,227  
Funded status at end of year (2,537) (4,887)  
Change in Plan/Trust Assets [Member] | Other Postretirement Benefit Plans, Defined Benefit
     
Change in Plan/Trust Assets      
Fair value of assets at beginning of year 426 379  
Actual return on plan assets 116 64  
Employer contributions 25 32  
Settlement/curtailment/other 0 0  
Benefits paid (48) (49)  
Fair value of assets at end of year 519 426  
Funded status at end of year $ (664) $ (958)