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Changes in Accumulated Other Comprehensive Income (Reclassification out of Accumulated Other Comprehensive Income)(Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Operating revenues $ 6,082 $ 4,690
Interest Expense 617 189
Other income and deductions (451) (1)
Income before income taxes 57 358
Income taxes 56 158
Net income (loss) 1 200
Other Comprehensive Income Loss Reclassification Adjustment From AOCI Pension And Other Postretirement Benefit PlansTax [Abstract]    
Gain (loss) on equity method investments (9) (22)
Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
   
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Income before income taxes 98 [1]  
Income taxes (40) [1]  
Net income (loss) 58 [1]  
Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Energy Related Derivative [Member]
   
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Operating revenues 99 [1]  
Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Cash Flow Hedging [Member]
   
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Interest Expense (1) [1]  
Accumulated Net Unrealized Investment Gain Loss [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
   
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Income before income taxes 0  
Income taxes 0  
Net income (loss) 0  
Accumulated Net Unrealized Investment Gain Loss [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Rabbi Trust Investments [Member]
   
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Other income and deductions 0  
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
   
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Income before income taxes (83) [1]  
Income taxes 33 [1]  
Net income (loss) (50) [1]  
Other Comprehensive Income Loss Reclassification Adjustment From AOCI Pension And Other Postretirement Benefit PlansTax [Abstract]    
Prior service costs 0  
Transition obligation 0  
Actuarial gains/losses (83) [1],[2]  
Deferred compensation unit 0  
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Derivative [Member]
   
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Other income and deductions 0  
Equity Method Investments | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
   
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Income before income taxes 1 [1]  
Income taxes (2) [1]  
Equity Method Investments | Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Pension Plans Defined Benefit [Member]
   
Other Comprehensive Income Loss Reclassification Adjustment From AOCI Pension And Other Postretirement Benefit PlansTax [Abstract]    
Gain (loss) on equity method investments (3) [1]  
Equity Method Investments | Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Other Equity Investment Reclassified Out of Accumulated Other Comprehensive Income [Member]
   
Other Comprehensive Income Loss Reclassification Adjustment From AOCI Pension And Other Postretirement Benefit PlansTax [Abstract]    
Gain (loss) on equity method investments (3) [1]  
Exelon Generation Co L L C [Member]
   
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Operating revenues 3,533 2,743
Interest Expense 82 54
Other income and deductions 46 124
Income before income taxes (18) 396
Income taxes (1) 230
Net income (loss) (17) 166
Other Comprehensive Income Loss Reclassification Adjustment From AOCI Pension And Other Postretirement Benefit PlansTax [Abstract]    
Gain (loss) on equity method investments (9) (22)
Exelon Generation Co L L C [Member] | Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
   
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Income before income taxes 223 [1]  
Income taxes (88) [1]  
Net income (loss) 135 [1]  
Exelon Generation Co L L C [Member] | Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Energy Related Derivative [Member]
   
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Operating revenues 223 [1]  
Exelon Generation Co L L C [Member] | Accumulated Net Unrealized Investment Gain Loss [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
   
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Income before income taxes 0  
Income taxes 0  
Net income (loss) 0  
Exelon Generation Co L L C [Member] | Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Derivative [Member]
   
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Other income and deductions 0  
Exelon Generation Co L L C [Member] | Equity Method Investments | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
   
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Income before income taxes 1 [1]  
Income taxes (2) [1]  
Exelon Generation Co L L C [Member] | Equity Method Investments | Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Pension Plans Defined Benefit [Member]
   
Other Comprehensive Income Loss Reclassification Adjustment From AOCI Pension And Other Postretirement Benefit PlansTax [Abstract]    
Gain (loss) on equity method investments (3) [1]  
Exelon Generation Co L L C [Member] | Equity Method Investments | Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Other Equity Investment Reclassified Out of Accumulated Other Comprehensive Income [Member]
   
Other Comprehensive Income Loss Reclassification Adjustment From AOCI Pension And Other Postretirement Benefit PlansTax [Abstract]    
Gain (loss) on equity method investments (3) [1]  
Commonwealth Edison Co [Member]
   
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Operating revenues 1,160 1,388
Interest Expense 350 79
Other income and deductions (348) (78)
Income before income taxes (139) 148
Income taxes (58) 61
Net income (loss) (81) 87
Commonwealth Edison Co [Member] | Accumulated Net Unrealized Investment Gain Loss [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
   
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Income before income taxes 0  
Income taxes 0  
Net income (loss) 0  
Commonwealth Edison Co [Member] | Accumulated Net Unrealized Investment Gain Loss [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Rabbi Trust Investments [Member]
   
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Other income and deductions 0  
Commonwealth Edison Co [Member] | Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Derivative [Member]
   
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Other income and deductions 0  
PECO Energy Co [Member]
   
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Operating revenues 895 875
Interest Expense 26 28
Other income and deductions (26) (29)
Income before income taxes 177 148
Income taxes 55 51
Net income (loss) 122 97
PECO Energy Co [Member] | Accumulated Net Unrealized Investment Gain Loss [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
   
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Income before income taxes 0  
Income taxes 0  
Net income (loss) 0  
PECO Energy Co [Member] | Accumulated Net Unrealized Investment Gain Loss [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Rabbi Trust Investments [Member]
   
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Other income and deductions 0  
PECO Energy Co [Member] | Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Derivative [Member]
   
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Other income and deductions 0  
Baltimore Gas and Electric Company [Member]
   
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Operating revenues 880 697
Interest Expense 33 41
Other income and deductions (28) (35)
Income before income taxes 135 (46)
Income taxes 55 (16)
Net income (loss) 80 (30)
Baltimore Gas and Electric Company [Member] | Accumulated Net Unrealized Investment Gain Loss [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
   
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Income before income taxes 0  
Income taxes 0  
Net income (loss) 0  
Baltimore Gas and Electric Company [Member] | Accumulated Net Unrealized Investment Gain Loss [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Rabbi Trust Investments [Member]
   
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Other income and deductions 0  
Baltimore Gas and Electric Company [Member] | Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Derivative [Member]
   
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]    
Other income and deductions $ 0  
[1] (a) All amounts are net of tax. Amounts in parenthesis represent a decrease in net income.
[2] (b) This accumulated other comprehensive income component is included in the computation of net periodic pension and OPEB cost (see note 13 for additional details)