XML 44 R45.htm IDEA: XBRL DOCUMENT
v3.19.3

Summary of Significant Accounting Policies and Other Matters - Acquisitions and Investments (Details) - Sempra Solar Holdings, LLC - Con Edison Development $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2019 USD ($)
Business Acquisition [Line Items] |
Purchase price adjustment, reclassification, decrease in property, plant and equipment | $ 100
Purchase price adjustment, reclassification, decrease in asset retirement obligations | $ 100

X
- Definition Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Asset Retirement Obligations + References No definition available. + Details
Name: | ed_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAssetRetirementObligations
Namespace Prefix: | ed_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to property, plant, and equipment acquired in connection with a business combination for which the initial accounting was incomplete. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 4A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=SL65897772-128472 + Details
Name: | us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentPropertyPlantAndEquipment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=ed_SempraSolarHoldingsLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=ed_ConsolidatedEdisonDevelopmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |