XML 49 R30.htm IDEA: XBRL DOCUMENT  v2.3.0.11
Debt and Credit Agreements Year-End (Tables)
6 Months Ended
Jun. 30, 2011
Debt Tables [Line Items]  
Schedule Of Short Term Debt [Text Block]
 Commercial Paper BorrowingsJune 30, 2011 December 31, 2010
 Exelon Corporate$140 $0
 Generation 0  0
 ComEd 0  0
 PECO  0  0