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Corporate Restructuring and Plant Retirements (Tables)
6 Months Ended
Jun. 30, 2011
Corporate Restructuring And Plant Retirements Tables  
Activity of severance obligations for the announced Cromby and Eddystone retirements
Severance Benefits Obligation  Exelon and Generation
Balance at December 31, 2010 $ 7
Severance charges recorded   3
Cash payments   (2)
     
Balance at June 30, 2011 $ 8