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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 30, 2012
Commitments And Contingencies Tables Disclosure [Line Items]  
Energy Commitments [Text Block]
 Net Capacity Power-Related Transmission Rights Purchased Energy   
 Purchases (a)  Purchases (b)  Purchases (c)  from CENG Total 
                          
2012 $ 111   $ 8   $ 8   $ 148   $ 275  
2013   375     92     32     699     1,198  
2014   352     62     26     451     891  
2015   350     23     13     —     386  
2016   266     9     2     —     277  
Thereafter   672     8     36     —     716  
                          
Total $ 2,126   $ 202   $ 117   $ 1,298   $ 3,743  

 

(a)       Net capacity purchases include PPAs and other capacity contracts including those that are accounted for as operating leases. Amounts presented in the commitments represent Generation's expected payments under these arrangements at September 30, 2012, net of fixed capacity payments expected to be received by Generation under contracts to resell such acquired capacity to third parties under long-term capacity sale contracts. Expected payments include certain capacity charges which are contingent on plant availability.

(b)       Power-Related Purchases include firm REC purchase agreements. The table excludes renewable energy purchases that are contingent in nature.

(c)       Transmission rights purchases include estimated commitments for additional transmission rights that will be required to fulfill firm sales contracts.
Utility Energy Purchase Commitments [Text Block]
    Expiration within
                   2017
 Total  2012 2013 2014 2015 2016 and beyond
                     
ComEd                    
Electric supply procurement (a)$ 1,103 $ - $ 367 $ 323 $ 136 $ 137 $ 140
Renewable energy and RECs (b)  1,694   33   71   73   74   76   1,367
PECO                    
Electric supply procurement (c)  789   210   413   130   36   -   -
AECs  35   3   11   9   2   2   8
Curtailment services  4   4   -   -   -   -   -
BGE                    
Electric supply procurement (d)  1,171   201   707   263   -   -   -
Curtailment services  165   11   49   47   41   17   -

 

(a)       ComEd entered into various contracts for the procurement of electricity that expire between 2012 and 2017. ComEd is permitted to recover its electric supply procurement costs from retail customers with no mark-up. See Note 4 - Regulatory Matters for additional information.

(b)       ComEd entered into various contracts for the procurement of renewable energy and RECs that expire between 2012 and 2032. ComEd is permitted to recover its renewable energy and REC costs from retail customers with no mark-up. If events were to occur such that ComEd is not allowed to recover the costs under these contracts from retail customers, ComEd may elect to reduce the annual quantity purchased under these contracts. See Note 4 - Regulatory Matters for additional information.

(c)       PECO entered into various contracts for the procurement of electric supply to serve its default service customers that expire between 2012 and 2015. PECO is permitted to recover its electric supply procurement costs from default service customers with no mark-up in accordance with its PAPUC-approved DSP Program. See Note 4 - Regulatory Matters for additional information.

(d)       BGE entered into various contracts for the procurement of electricity that expire between 2012 and 2014. The cost of power under these contracts is recoverable under MDPSC approved fuel clauses. See Note 4 - Regulatory Matters for additional information.

 
Fuel Purchase Commitments [Text Block]
    Expiration within
                   2017
 Total  2012 2013 2014 2015 2016 and beyond
                     
Generation$ 8,668 $ 263 $ 1,252 $ 1,298 $ 1,279 $ 929 $ 3,647
PECO  412   55   114   68   53   31   91
BGE  657   44   125   72   52   51   313

    Expiration within
                   2017
 Total  2012 2013 2014 2015 2016 and beyond
                     
Exelon$ 1,049 $ 434 $ 217 $ 135 $ 94 $ 32 $ 137
Generation  555   248   110   91   69   8   29
ComEd  115   41   34   6   5   5   24
PECO  109   61   21   17   1   1   8
BGE  19   17   2   —   —   —   —
Commercial Commitments [Text Block]
    Exelon  Generation  ComEd  PECO  BGE 
                  
Letters of credit (non-debt) (a) $2,290 $2,082 $142 $22 $1 
Guarantees  10,406(b) 2,355(c) 208(d) 181(e) 250(f)
Nuclear insurance premiums (g)  2,098  2,098  0  0  0 
                  
Total commercial commitments $14,794 $6,535 $350 $203 $251 

 

(a)       Non-debt letters of credit maintained to provide credit support for certain transactions as requested by third parties.

(b)       Primarily reflects parental guarantees issued on behalf of Generation to allow the flexibility needed to conduct business with counterparties without having to post other forms of collateral. Also reflects guarantees issued to ensure performance under specific contracts, preferred securities of financing trusts, property leases, indemnifications, NRC minimum funding assurance requirements and $211 million on behalf of CENG nuclear generating facilities for credit support and miscellaneous guarantees. The estimated net exposure for obligations under commercial transactions covered by these guarantees was $1.5 billion at September 30, 2012, which represents the total amount Exelon could be required to fund based on September 30, 2012 market prices.

(c)       Primarily reflects guarantees issued to ensure performance under energy marketing and other specific contracts and $211 million on behalf of CENG nuclear generating facilities for credit support. The estimated net exposure for obligations under commercial transactions covered by these guarantees was $0.5 billion at September 30, 2012, which represents the total amount Generation could be required to fund based on September 30, 2012 market prices.

(d)       Primarily reflects full and unconditional guarantees of $200 million Trust Preferred Securities of ComEd Financing III.

(e)       Primarily reflects full and unconditional guarantees of $178 million Trust Preferred Securities of PECO Trust III and IV.

(f)       Primarily reflects full and unconditional guarantees of $250 million Trust Preferred Securities of BGE Capital Trust II.

(g)       Does not include potential maximum combined retrospective premium obligations of CENG amounting to $691 million of which Generation's ownership interest is 50.01%.

 
Accrued environmental liabilities [Text Block]
 September 30, 2012Total Environmental Investigation and Remediation Reserve  Portion of Total Related to MGP Investigation and Remediation  
 Exelon$351 $307 
 Generation 35  0 
 ComEd 265  260 
 PECO 50  47 
 BGE 1  0 
 December 31, 2011Total Environmental Investigation and Remediation Reserve  Portion of Total Related to MGP Investigation and Remediation  
 Exelon$224 $168 
 Generation 47  0 
 ComEd 127  121 
 PECO 50  47 
 BGE 0  0