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Commitments And Contingencies (Environmental) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Environmental [Roll Forward]    
Beginning balance – January 1 $ 649 $ 710
Reductions for payments made (19) (8)
Changes in estimates 16 5
Ending balance – March 31 $ 646 $ 707