XML 48 R67.htm IDEA: XBRL DOCUMENT
v3.19.3

Other Material Contingencies - Manhattan Steam Main Rupture (Details) $ in Millions | Sep. 30, 2019 USD ($)
--- | ---
Property Damage, Clean Up and Other Response Costs Related with Manhattan Steam Main Rupture |
Loss Contingencies [Line Items] |
Loss contingency | $ 16
Capital, Retirement and Other Costs Related with Manhattan Steam Main Rupture |
Loss Contingencies [Line Items] |
Loss contingency | $ 10

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_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of loss contingency liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349 + Details
Name: | us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=ed_PropertyDamageCleanUpAndOtherCostsRelatedWithManhattanSteamMainRuptureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=ed_CapitalRetirementAndOtherCostsRelatedWithManhattanSteamMainRuptureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |