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Merger and Acquisitions (Tables)
3 Months Ended
Mar. 31, 2014
Business Acquisition [Line Items]  
Schedule Of Severance Costs [TableTextBlock]
Severance Benefits Exelon  Generation  ComEd  PECO  BGE 
Severance charges - 2014$ 4 $ 4 $0 $0 $0 
Severance charges - 2013  1  0   1  0  0