2.2.0.7 true Pension Benefits (Narrative) (Details) (USD $) 40501 - Disclosure - Pension Benefits (Narrative) (Details) true false In Millions false false 1 USD true false false false CONSOLIDATED EDISON INC [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_ParentCompanyMember dei_LegalEntityAxis explicitMember false false Defined Benefit Pension [Member] us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_DefinedBenefitPensionMember us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 2 USD true false false false CONSOLIDATED EDISON INC [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_ParentCompanyMember dei_LegalEntityAxis explicitMember false false Defined Benefit Pension [Member] us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_DefinedBenefitPensionMember us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 3 USD true false false false CECONY [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi ed_CeconyMember dei_LegalEntityAxis explicitMember false false Defined Benefit Pension [Member] us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_DefinedBenefitPensionMember us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 4 USD true false false false CECONY [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi ed_CeconyMember dei_LegalEntityAxis explicitMember false false Defined Benefit Pension [Member] us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_DefinedBenefitPensionMember us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 5 USD true false false false Other Nonqualified Supplemental Defined Benefit Pension [Member] us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis xbrldi http://xbrl.org/2006/xbrldi ed_OtherNonqualifiedSupplementalDefinedBenefitPensionMember us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ 5 Expected discretionary contributions to pension plan 3 us-gaap_DefinedBenefitPlanContributionsByEmployer us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 true true false false 434000000 434 true false false 2 true true false false 282000000 282 true false false 3 true true false false 397000000 397 true false false 4 true true false false 244000000 244 true false false 5 true true false false 25000000 25 true false false xbrli:monetaryItemType monetary The amount of contributions made by the employer. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b false 5 1 false Millions UnKnown UnKnown false true