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Liabilities, Commitments And Contingencies (Schedule Of Environmental Remediation Activity) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Accrual for Environmental Loss Contingencies [Roll Forward]    
Beginning balance - January 1 $ 710 $ 758
Reductions for payments made (120) (121)
Changes in estimates (59) (73)
Ending balance - December 31 $ 649 $ 710