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Variable Interest Entities - Carrying Amounts and Classification of Consolidated VIE Assets and Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Variable Interest Entity [Line Items]    
Current assets $ 1,271exc_VariableInterestEntityConsolidatedCarryingAmountCurrentAssets [1],[2] $ 484exc_VariableInterestEntityConsolidatedCarryingAmountCurrentAssets [1]
Noncurrent assets 7,580exc_VariableInterestEntityConsolidatedCarryingAmountNonCurrentAssets [1],[2] 1,905exc_VariableInterestEntityConsolidatedCarryingAmountNonCurrentAssets [1]
Total assets 8,851us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets [1],[2] 2,389us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets [1]
Current liabilities 611exc_VariableInterestEntityConsolidatedCarryingAmountCurrentLiabilities [1],[2] 566exc_VariableInterestEntityConsolidatedCarryingAmountCurrentLiabilities [1]
Noncurrent liabilities 2,730exc_VariableInterestEntityConsolidatedCarryingAmountNonCurrentLiabilities [1],[2] 774exc_VariableInterestEntityConsolidatedCarryingAmountNonCurrentLiabilities [1]
Total liabilities 3,341us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities [1],[2] 1,340us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities [1]
Assets 86,814us-gaap_Assets [3] 79,924us-gaap_Assets [3]
Liabilities 62,681us-gaap_Liabilities [3] 56,984us-gaap_Liabilities [3]
Equity Method Investment Variable Interest Entities [Member]    
Variable Interest Entity [Line Items]    
Assets 6,100us-gaap_Assets
/ exc_VariableInterestEntitiesByTypeOfEntityAxis
= exc_EquityMethodInvestmentVariableInterestEntitiesMember		  
Liabilities 2,100us-gaap_Liabilities
/ exc_VariableInterestEntitiesByTypeOfEntityAxis
= exc_EquityMethodInvestmentVariableInterestEntitiesMember		  
Exelon Generation Co L L C [Member]    
Variable Interest Entity [Line Items]    
Current assets 1,242exc_VariableInterestEntityConsolidatedCarryingAmountCurrentAssets
/ dei_LegalEntityAxis
= exc_ExelonGenerationCoLLCMember		 [2] 446exc_VariableInterestEntityConsolidatedCarryingAmountCurrentAssets
/ dei_LegalEntityAxis
= exc_ExelonGenerationCoLLCMember
Noncurrent assets 7,566exc_VariableInterestEntityConsolidatedCarryingAmountNonCurrentAssets
/ dei_LegalEntityAxis
= exc_ExelonGenerationCoLLCMember		 [2] 1,884exc_VariableInterestEntityConsolidatedCarryingAmountNonCurrentAssets
/ dei_LegalEntityAxis
= exc_ExelonGenerationCoLLCMember
Total assets 8,808us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
/ dei_LegalEntityAxis
= exc_ExelonGenerationCoLLCMember		 [2] 2,330us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
/ dei_LegalEntityAxis
= exc_ExelonGenerationCoLLCMember
Current liabilities 526exc_VariableInterestEntityConsolidatedCarryingAmountCurrentLiabilities
/ dei_LegalEntityAxis
= exc_ExelonGenerationCoLLCMember		 [2] 481exc_VariableInterestEntityConsolidatedCarryingAmountCurrentLiabilities
/ dei_LegalEntityAxis
= exc_ExelonGenerationCoLLCMember
Noncurrent liabilities 2,600exc_VariableInterestEntityConsolidatedCarryingAmountNonCurrentLiabilities
/ dei_LegalEntityAxis
= exc_ExelonGenerationCoLLCMember		 [2] 562exc_VariableInterestEntityConsolidatedCarryingAmountNonCurrentLiabilities
/ dei_LegalEntityAxis
= exc_ExelonGenerationCoLLCMember
Total liabilities 3,126us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities
/ dei_LegalEntityAxis
= exc_ExelonGenerationCoLLCMember		 [2] 1,043us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities
/ dei_LegalEntityAxis
= exc_ExelonGenerationCoLLCMember
Assets 45,348us-gaap_Assets
/ dei_LegalEntityAxis
= exc_ExelonGenerationCoLLCMember		 [4] 41,232us-gaap_Assets
/ dei_LegalEntityAxis
= exc_ExelonGenerationCoLLCMember		 [4]
Liabilities 31,297us-gaap_Liabilities
/ dei_LegalEntityAxis
= exc_ExelonGenerationCoLLCMember		 [4] 28,490us-gaap_Liabilities
/ dei_LegalEntityAxis
= exc_ExelonGenerationCoLLCMember		 [4]
Baltimore Gas and Electric Company [Member]    
Variable Interest Entity [Line Items]    
Current assets 21exc_VariableInterestEntityConsolidatedCarryingAmountCurrentAssets
/ dei_LegalEntityAxis
= exc_BaltimoreGasAndElectricCompanyMember		 28exc_VariableInterestEntityConsolidatedCarryingAmountCurrentAssets
/ dei_LegalEntityAxis
= exc_BaltimoreGasAndElectricCompanyMember
Noncurrent assets 3exc_VariableInterestEntityConsolidatedCarryingAmountNonCurrentAssets
/ dei_LegalEntityAxis
= exc_BaltimoreGasAndElectricCompanyMember		 3exc_VariableInterestEntityConsolidatedCarryingAmountNonCurrentAssets
/ dei_LegalEntityAxis
= exc_BaltimoreGasAndElectricCompanyMember
Total assets 24us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
/ dei_LegalEntityAxis
= exc_BaltimoreGasAndElectricCompanyMember		 31us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
/ dei_LegalEntityAxis
= exc_BaltimoreGasAndElectricCompanyMember
Current liabilities 77exc_VariableInterestEntityConsolidatedCarryingAmountCurrentLiabilities
/ dei_LegalEntityAxis
= exc_BaltimoreGasAndElectricCompanyMember		 74exc_VariableInterestEntityConsolidatedCarryingAmountCurrentLiabilities
/ dei_LegalEntityAxis
= exc_BaltimoreGasAndElectricCompanyMember
Noncurrent liabilities 120exc_VariableInterestEntityConsolidatedCarryingAmountNonCurrentLiabilities
/ dei_LegalEntityAxis
= exc_BaltimoreGasAndElectricCompanyMember		 195exc_VariableInterestEntityConsolidatedCarryingAmountNonCurrentLiabilities
/ dei_LegalEntityAxis
= exc_BaltimoreGasAndElectricCompanyMember
Total liabilities 197us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities
/ dei_LegalEntityAxis
= exc_BaltimoreGasAndElectricCompanyMember		 269us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities
/ dei_LegalEntityAxis
= exc_BaltimoreGasAndElectricCompanyMember
Assets 8,078us-gaap_Assets
/ dei_LegalEntityAxis
= exc_BaltimoreGasAndElectricCompanyMember		 [5] 7,861us-gaap_Assets
/ dei_LegalEntityAxis
= exc_BaltimoreGasAndElectricCompanyMember		 [5]
Liabilities $ 5,325us-gaap_Liabilities
/ dei_LegalEntityAxis
= exc_BaltimoreGasAndElectricCompanyMember		 [5] $ 5,306us-gaap_Liabilities
/ dei_LegalEntityAxis
= exc_BaltimoreGasAndElectricCompanyMember		 [5]
[1] Includes certain purchase accounting adjustments not pushed down to the BGE standalone entity.
[2] Includes total assets of $6.1 billion and total liabilities of $2.1 billion due to the consolidation of CENG. See Note 5— Investment in Constellation Energy Nuclear Group, LLC for additional information.
[3] Exelon’s consolidated assets include $8,160 million and $1,755 million at December 31, 2014 and December 31, 2013, respectively, of certain VIEs that can only be used to settle the liabilities of the VIE. Exelon’s consolidated liabilities include $2,723 million and $658 million at December 31, 2014 and December 31, 2013, respectively, of certain VIEs for which the VIE creditors do not have recourse to Exelon. See Note 2–Variable Interest Entities.
[4] Generation’s consolidated assets include $8,119 million and $1,695 million at December 31, 2014 and December 31, 2013, respectively, of certain VIEs that can only be used to settle the liabilities of the VIE. Generation’s consolidated liabilities include $2,507 million and $362 million at December 31, 2014 and December 31, 2013, respectively, of certain VIEs for which the VIE creditors do not have recourse to Generation. See Note 2–Variable Interest Entities.
[5] BGE’s consolidated assets include $24 million and $31 million at December 31, 2014 and December 31, 2013, respectively, of BGE’s consolidated VIE that can only be used to settle the liabilities of the VIE. BGE’s consolidated liabilities include $197 million and $269 million at December 31, 2014 and December 31, 2013, respectively, of BGE’s consolidated VIE for which the VIE creditors do not have recourse to BGE. See Note 2 - Variable Interest Entities.