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Schedule I - Condensed Financial Information of Parent (Exelon Corporate) - Debt and Credit Agreements - Narrative (Details) (USD $)
Dec. 31, 2014
May 30, 2014
Line of Credit Facility [Line Items]    
Line of Credit Facility, Capacity Available for Trade Purchases $ 6,771,000,000us-gaap_LineOfCreditFacilityCapacityAvailableForTradePurchases [1]  
Exelon Corporate [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Capacity Available for Trade Purchases 494,000,000us-gaap_LineOfCreditFacilityCapacityAvailableForTradePurchases
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 [1]  
Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Maximum Program Size 8,500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember		 [2]  
Revolving Credit Facility [Member] | Exelon Corporate [Member]    
Line of Credit Facility [Line Items]    
Maximum Program Size $ 500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember		 [2] $ 500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember		 [3],[4]
[1] Excludes $200 million bilateral credit facilities that do not back Generation’s commercial paper program.
[2] Excludes additional credit facility agreements for Generation, ComEd, PECO and BGE with aggregate commitments of $50 million, $34 million, $34 million and $5 million, respectively, arranged with minority and community banks located primarily within ComEd’s, PECO’s and BGE’s service territories. These facilities expired on October 17, 2014 and were renewed at the same amount through October 16, 2015. These facilities are solely utilized to issue letters of credit. As of December 31, 2014, letters of credit issued under these agreements totaled $9 million, $16 million, $21 million and $1 million for Generation, ComEd, PECO and BGE, respectively. Also, excludes the unsecured bridge credit facility of $3.2 billion at December 31, 2014, to support the PHI transaction discussed below
[3] Excludes additional credit facility agreements for Generation, ComEd, PECO and BGE with aggregate commitments of $50 million, $34 million, $34 million and $5 million, respectively, arranged with minority and community banks located primarily within ComEd’s, PECO’s and BGE’s service territories. These facilities expired on October 17, 2014 and were renewed at the same amount through October 16, 2015. These facilities are solely utilized to issue letters of credit. As of December 31, 2014, letters of credit issued under these agreements totaled $9 million, $16 million, $21 million and $1 million for Generation, ComEd, PECO and BGE, respectively. Also, excludes the unsecured bridge credit facility of $3.2 billion at December 31, 2014, to support the PHI transaction discussed below.
[4] aggregate bank commitments under the revolving and bilateral credit agreements (with the exception of $200 million bilateral agreements for Generation) that backstop the commercial paper program. See discussion below and Credit Agreements table below for items affecting effective program size.