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Uncategorized Items
[us-gaap_StockholdersEquity]
 (1,000,000)
/ dei_LegalEntityAxis
= exc_CommonwealthEdisonCoMember
/ us-gaap_StatementEquityComponentsAxis
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/ dei_LegalEntityAxis
= exc_CommonwealthEdisonCoMember
/ us-gaap_StatementEquityComponentsAxis
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/ dei_LegalEntityAxis
= exc_CommonwealthEdisonCoMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_OtherAdditionalCapitalMember		 2,086,000,000
/ dei_LegalEntityAxis
= exc_CommonwealthEdisonCoMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsAppropriatedMember		 (1,639,000,000)
/ dei_LegalEntityAxis
= exc_CommonwealthEdisonCoMember
/ us-gaap_StatementEquityComponentsAxis
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/ dei_LegalEntityAxis
= exc_PecoEnergyCoMember
/ us-gaap_StatementEquityComponentsAxis
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/ dei_LegalEntityAxis
= exc_PecoEnergyCoMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember