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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 30, 2013
Commitments And Contingencies Tables Disclosure [Line Items]  
Energy Commitments [Text Block]
 Net Capacity REC Transmission Rights Purchased Energy   
 Purchases (a)  Purchases (b)  Purchases (c)  from CENG Total 
                          
2013 $ 86   $ 17   $ 7   $ 186   $ 296  
2014   396     124     26     745     1,291  
2015   368     97     13     —     478  
2016   285     57     2     —     344  
2017   223     16     2     —     241  
Thereafter   526     5     34     —     565  
                          
Total $ 1,884   $ 316   $ 84   $ 931   $ 3,215  

 

(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, 2013, 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. These capacity payments represent the fixed, or pre-determined, payment for output from contracted generation facilities. Output in this context generally includes products such as energy, capacity, and various ancillary services associated with generating facilities. 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
                   2018
 Total  2013 2014 2015 2016 2017 and beyond
                     
ComEd                    
Electric supply procurement (a)$ 878 $ 142 $ 323 $ 136 $ 137 $ 140 $ -
Renewable energy and RECs (b)  1,604   20   67   74   76   77   1,290
PECO                    
Electric supply procurement (c)  886   211   584   91   -   -   -
AECs  15   1   2   2   2   2   6
BGE                    
Electric supply procurement (d)  1,122   227   669   226   -   -   -
Curtailment services (e)  147   13   46   41   34   13   -

(a)       ComEd entered into various contracts for the procurement of electricity that started to expire in 2012, and will continue to expire through 2017. ComEd is permitted to recover its electric supply procurement costs from retail customers with no mark-up. See Note 5 – Regulatory Matters for additional information.

(b)       ComEd entered into 20-year contracts for renewable energy and RECs beginning June 2012. ComEd is permitted to recover its renewable energy and REC costs from retail customers with no mark-up. Pursuant to the ICC's Order on December 19, 2012, ComEd's commitments under the existing long-term contracts for energy and associated RECs were reduced in the first quarter of 2013. See Note 5 – 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 2013 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 Programs. See Note 5 - Regulatory Matters for additional information.

(d)       BGE entered into various contracts for the procurement of electricity that expire between 2013 and 2015. The cost of power under these contracts is recoverable under MDPSC approved fuel clauses. See Note 5 - Regulatory Matters for additional information.

(e)       BGE has entered into various contracts with curtailment services providers related to transactions in PJM's capacity market. See Note 5 - Regulatory Matters for additional information.

 
Fuel Purchase Commitments [Text Block]
    Expiration within
                   2018
 Total  2013 2014 2015 2016 2017 and beyond
                     
Generation$ 7,901 $ 339 $ 1,199 $ 1,233 $ 1,021 $ 1,050 $ 3,059
PECO  477   54   128   100   78   36   81
BGE  603   46   123   52   51   50   281
Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table Text Block]
Description Payment Period BGE Generation Exelon Statement of Operations Location
BGE rate credit of $100 per residential customer (a) Q2 2012 $113 $0 $ 113 Revenues
Customer investment fund to invest in energy efficiency              
 and low-income energy assistance to BGE customers  2012 to 2014  0  0   113.5 O&M Expense
Contribution for renewable energy, energy efficiency             
 or related projects in Baltimore 2012 to 2014  0  0   2 O&M Expense
Charitable contributions at $7 million per year for 10 years 2012 to 2021  28  35   70 O&M Expense
State funding for offshore wind development projects  Q2 2012  0  0   32 O&M Expense
Miscellaneous tax benefits Q2 2012  (2)  0  (2) Taxes Other Than Income
 Total   $139 $35 $ 328.5  

____________________

(a)       Exelon made a $66 million equity contribution to BGE in the second quarter of 2012 to fund the after-tax amount of the rate credit as directed in the MDPSC order approving the merger transaction.

 
Commercial Commitments [Text Block]
    Exelon  Generation  ComEd  PECO  BGE 
                  
Letters of credit (non-debt) (a) $1,514 $1,463 $26 $22 $1 
Guarantees  4,908(b) 1,271(c) 209(d) 181(e) 252(f)
Nuclear insurance premiums (g)  3,096  3,096  0  0  0 
                  
Total commercial commitments $9,518 $5,830 $235 $203 $253 

 

(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 $0.6 billion at September 30, 2013, which represents the total amount Exelon could be required to fund based on September 30, 2013 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 $0.2 billion at September 30, 2013, which represents the total amount Generation could be required to fund based on September 30, 2013 market prices.

(d)       Primarily reflects full and unconditional guarantees of $200 million Trust Preferred Securities of ComEd Financing III, which is a 100% owned finance subsidiary of ComEd.

(e)       Primarily reflects full and unconditional guarantees of $178 million Trust Preferred Securities of PECO Trust III and IV, which are 100% owned finance subsidiaries of PECO.

(f)       Primarily reflects full and unconditional guarantees of $250 million Trust Preferred Securities of BGE Capital Trust II, which is a 100% owned finance subsidiary of BGE.

(g)       Represents the maximum amount that Generation would be required to pay for retrospective premiums in the event of nuclear disaster at any domestic site under the Secondary Financial Protection pool as required under the Price-Anderson Act as well as the current aggregate annual retrospective premium obligation that could be imposed by NEIL. See the Nuclear Insurance section within this note for additional details on Generation's nuclear insurance premiums.

 
Accrued environmental liabilities [Text Block]
 September 30, 2013Total Environmental Investigation and Remediation Reserve  Portion of Total Related to MGP Investigation and Remediation  
 Exelon$345 $280 
 Generation 56  0 
 ComEd 237  232 
 PECO 51  48 
 BGE 1  0 
 December 31, 2012Total Environmental Investigation and Remediation Reserve  Portion of Total Related to MGP Investigation and Remediation  
 Exelon$351 $298 
 Generation 42  0 
 ComEd 261  254 
 PECO 47  44 
 BGE 1  0 
Other Purchase Obligation [Table Text Block]
    Expiration within
                   2018
 Total  2013 2014 2015 2016 2017 and beyond
                     
Exelon$ 269 $ 33 $ 38 $ 32 $ 31 $ 31 $ 104
Generation  628   133   178   127   40   38   112
ComEd (a)  82   7   41   5   5   5   19
PECO (a)  54   19   25   1   1   1   7
BGE (a)  25   2   21   2   —   —   —

(a)       Purchase obligations include commitments related to smart meter installation. See Note 5 - Regulatory Matters for additional information.