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Benefit Plans (Narrative) (Details) (USD $)
In Millions
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Mar. 31, 2010
Jun. 30, 2011
Jun. 30, 2010
U.S. Pension Plans [Member]
         
Settlement losses $ 19 $ 14   $ 36 $ 56
Curtailment charge     5    
Employer contribution       527  
Estimated future employer contributions during remainder of year 15     15  
Non-U.S. Pension Plans [Member]
         
Employer contribution       185  
Estimated future employer contributions during remainder of year $ 215     $ 215