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Document and Entity Information
9 Months Ended
Sep. 30, 2011
Entity Registrant NameEXELON CORP
Entity Central Index Key0001109357
Document Type10-Q
Document Period End DateSep. 30, 2011
Amendment Flagfalse
Document Fiscal Year Focus2011
Document Fiscal Period FocusQ3
Current Fiscal Year End Date--12-31
Entity Well-known Seasoned IssuerYes
Entity Voluntary FilersNo
Entity Current Reporting StatusYes
Entity Filer CategoryLarge Accelerated Filer
Entity Common Stock Shares Outstanding663,012,607
Exelon Generation Co L L C [Member]
 
Entity Registrant NameEXELON GENERATION CO LLC
Entity Central Index Key0001168165
Entity Filer CategoryNon-accelerated Filer
Commonwealth Edison Co [Member]
 
Entity Registrant NameCOMMONWEALTH EDISON CO
Entity Central Index Key0000022606
Entity Filer CategoryNon-accelerated Filer
Entity Common Stock Shares Outstanding127,016,519
PECO Energy Co [Member]
 
Entity Registrant NamePECO ENERGY CO
Entity Central Index Key0000078100
Entity Filer CategoryNon-accelerated Filer
Entity Common Stock Shares Outstanding170,478,507