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Pension And Postretirement Benefits (Change In The Projected Benefit Obligation) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Pension Benefit [Member]
     
Benefit obligation at beginning of year $ 53,917 $ 50,850  
Service cost - benefits earned during the period 1,186 1,075 1,070
Interest cost on projected benefit obligation 2,958 3,150 3,355
Amendments 0 2  
Actuarial loss 2,972 4,224  
Special termination benefits 27 101  
Benefits paid (4,950) (5,485)  
Other 0 0  
Benefit obligation at end of year 56,110 53,917 50,850
Postretirement Benefit [Member]
     
Benefit obligation at beginning of year 36,638 36,225  
Service cost - benefits earned during the period 362 348 334
Interest cost on projected benefit obligation 2,051 2,257 2,434
Amendments (1,830) (742)  
Actuarial loss 478 1,046  
Special termination benefits 4 7  
Benefits paid (2,750) (2,536)  
Other 0 33  
Benefit obligation at end of year 34,953 36,638 36,225
Supplemental Retirement Plans [Member]
     
Service cost - benefits earned during the period 14 12 11
Interest cost on projected benefit obligation $ 126 $ 134 $ 140