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Debt and Credit Agreements (Maturitites of Long-term Debt) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Long Term Debt By Maturity [Abstract]  
Long Term Debt Maturities Repayments Of Principal In Next Twelve Months $ 979.00
Long Term Debt Maturities Repayments Of Principal In Year Two 1,483.00
Long Term Debt Maturities Repayments Of Principal In Year Three 1,613.00
Long Term Debt Maturities Repayments Of Principal In Year Four 1,041.00
Long Term Debt Maturities Repayments Of Principal In Year Five 1,462.00
Long Term Debt Maturities Repayments Of Principal After Year Five 12,367.00 [1]
Long Term Debt 18,945.00
Exelon Generation Co L L C [Member]
 
Long Term Debt By Maturity [Abstract]  
Long Term Debt Maturities Repayments Of Principal In Next Twelve Months 28.00
Long Term Debt Maturities Repayments Of Principal In Year Two 616.00
Long Term Debt Maturities Repayments Of Principal In Year Three 553.00
Long Term Debt Maturities Repayments Of Principal In Year Four 76.00
Long Term Debt Maturities Repayments Of Principal In Year Five 706.00
Long Term Debt Maturities Repayments Of Principal After Year Five 5,292.00
Long Term Debt 7,271.00
Commonwealth Edison Co [Member]
 
Long Term Debt By Maturity [Abstract]  
Long Term Debt Maturities Repayments Of Principal In Next Twelve Months 252.00
Long Term Debt Maturities Repayments Of Principal In Year Two 617.00
Long Term Debt Maturities Repayments Of Principal In Year Three 260.00
Long Term Debt Maturities Repayments Of Principal In Year Four 665.00
Long Term Debt Maturities Repayments Of Principal In Year Five 425.00
Long Term Debt Maturities Repayments Of Principal After Year Five 3,574.00 [2]
Long Term Debt 5,793.00
PECO Energy Co [Member]
 
Long Term Debt By Maturity [Abstract]  
Long Term Debt Maturities Repayments Of Principal In Next Twelve Months 300.00
Long Term Debt Maturities Repayments Of Principal In Year Two 250.00
Long Term Debt Maturities Repayments Of Principal In Year Three 0
Long Term Debt Maturities Repayments Of Principal In Year Four 0
Long Term Debt Maturities Repayments Of Principal In Year Five 0
Long Term Debt Maturities Repayments Of Principal After Year Five 1,584.00 [3]
Long Term Debt 2,134.00
Baltimore Gas and Electric Company [Member]
 
Long Term Debt By Maturity [Abstract]  
Long Term Debt Maturities Repayments Of Principal In Next Twelve Months 467.00
Long Term Debt Maturities Repayments Of Principal In Year Two 70.00
Long Term Debt Maturities Repayments Of Principal In Year Three 75.00
Long Term Debt Maturities Repayments Of Principal In Year Four 379.00
Long Term Debt Maturities Repayments Of Principal In Year Five 41.00
Long Term Debt Maturities Repayments Of Principal After Year Five 1,408.00 [4]
Long Term Debt $ 2,440.00
[1] )        Includes $648 million due to ComEd, PECO and BGE financing trusts.
[2] Includes $206 million due to ComEd financing trust.
[3] Includes $184 million due to PECO financing trusts.
[4] Includes $258 million due to BGE financing trust.