XML 67 R52.htm IDEA: XBRL DOCUMENT
v3.21.1

Regulatory Matters - Other Regulatory Matters (Details) customer in Thousands, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 36 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 30, 2020 USD ($) claim | Aug. 31, 2020 customer | Jul. 31, 2019 USD ($) customer | Mar. 31, 2021 USD ($) | Mar. 31, 2020 | Sep. 30, 2018 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2022 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Other Customer-Provided Capital rate |  |  |  | 1.80% | 2.65% |  |  |  |
Return on regulatory assets |  |  |  | $ 1,785.0 |  |  | $ 1,696.0 |  |
CECONY |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Return on regulatory assets |  |  |  | 1,590.0 |  |  | 1,509.0 |  |
CECONY | NYSPSC | Manhattan Steam Main Rupture |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Property damage, clean up and response expense |  |  |  | 17.0 |  |  |  |  |
Capital and retirement costs |  |  |  | 9.0 |  |  |  |  |
Loss contingency accrual |  |  |  |  |  |  | 3.0 |  |
CECONY | NYSPSC | Steam |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Income tax benefit to be credited to customers resulting from TCJA |  |  |  |  |  | $ 15.0 |  |  |
Impact in regulatory liability resulting from TCJA |  |  |  |  |  | $ 185.0 |  |  |
Tax credit, amortization period |  |  |  |  |  | 3 years |  |  |
CECONY | Electric | West Side of Manhattan |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Number of customers affected with interrupted service | customer |  |  | 72 |  |  |  |  |  |
Estimate of possible loss |  |  | $ 24.8 |  |  |  |  |  |
CECONY | Electric | Brooklyn |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Number of customers affected with interrupted service | customer |  |  | 30 |  |  |  |  |  |
Revenues, negative adjustment |  |  |  |  |  |  |  | $ 15.0 |
CECONY | Electric | Tropical Storm |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Number of customers affected with interrupted service | customer |  | 330 |  |  |  |  |  |  |
Estimate of possible loss | $ 102.3 |  |  |  |  |  |  |  |
Operation and maintenance expenses charged against a storm reserve |  |  |  | 87.0 |  |  |  |  |
Restoration costs |  |  |  | 172.0 |  |  |  |  |
Operation and maintenance expenses |  |  |  | 22.0 |  |  |  |  |
Capital expenditures |  |  |  | 63.0 |  |  |  |  |
Food and medicine spoilage expense |  |  |  | 7.5 |  |  |  |  |
Alleged number of claims, violations | claim | 33 |  |  |  |  |  |  |  |
CECONY | Electric | Scenario, Forecast |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Income tax benefit to be credited to customers resulting from TCJA |  |  |  |  |  |  |  |  | $ 377.0
TCJA, net benefit amortization, allocation period |  |  |  |  |  |  |  |  | 3 years
CECONY | Electric | Scenario, Forecast | Protected Portion |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Impact in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  | $ 1,663.0
CECONY | Electric | Scenario, Forecast | Unprotected Portion |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
TCJA, net benefit amortization, allocation period |  |  |  |  |  |  |  |  | 5 years
Impact in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  | $ 784.0
CECONY | Gas | Scenario, Forecast |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Income tax benefit to be credited to customers resulting from TCJA |  |  |  |  |  |  |  |  | $ 63.0
TCJA, net benefit amortization, allocation period |  |  |  |  |  |  |  |  | 2 years
CECONY | Gas | Scenario, Forecast | Protected Portion |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Impact in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  | $ 725.0
CECONY | Gas | Scenario, Forecast | Unprotected Portion |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
TCJA, net benefit amortization, allocation period |  |  |  |  |  |  |  |  | 5 years
Impact in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  | $ 107.0
O&R | Electric | Tropical Storm |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Property damage, clean up and response expense |  |  |  | 2.9 |  |  |  |  |
Number of customers affected with interrupted service | customer |  | 200 |  |  |  |  |  |  |
Estimate of possible loss | $ 19.0 |  |  |  |  |  |  |  |
Operation and maintenance expenses charged against a storm reserve |  |  |  | 29.0 |  |  |  |  |
Restoration costs |  |  |  | 37.0 |  |  |  |  |
Capital expenditures |  |  |  | 8.0 |  |  |  |  |
Alleged number of claims, violations | claim | 38 |  |  |  |  |  |  |  |
O&R | Electric and Gas Transmission Projects | Scenario, Forecast |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Income tax benefit to be credited to customers resulting from TCJA |  |  |  |  |  |  |  |  | $ 22.0
TCJA, net benefit amortization, allocation period |  |  |  |  |  |  |  |  | 3 years
O&R | Electric and Gas Transmission Projects | Scenario, Forecast | Protected Portion |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Impact in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  | $ 123.0
O&R | Electric and Gas Transmission Projects | Scenario, Forecast | Unprotected Portion |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
TCJA, net benefit amortization, allocation period |  |  |  |  |  |  |  |  | 15 years
Impact in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  | $ 30.0
RECO |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Return on regulatory assets |  |  |  | $ 27.0 |  |  | $ 31.0 |  |

X
- Definition Capital And Retirement Costs + References No definition available. + Details
Name: | ed_CapitalAndRetirementCosts
Namespace Prefix: | ed_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Other Customer Provided Capital Rate + References No definition available. + Details
Name: | ed_OtherCustomerProvidedCapitalRate
Namespace Prefix: | ed_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Property Damage, Clean Up And Response Expense + References No definition available. + Details
Name: | ed_PropertyDamageCleanUpAndResponseExpense
Namespace Prefix: | ed_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Public Utilities, Number Of Customers Affected + References No definition available. + Details
Name: | ed_PublicUtilitiesNumberOfCustomersAffected
Namespace Prefix: | ed_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public Utilities, Service And Repair Costs + References No definition available. + Details
Name: | ed_PublicUtilitiesServiceAndRepairCosts
Namespace Prefix: | ed_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Return On Regulatory Assets + References No definition available. + Details
Name: | ed_ReturnOnRegulatoryAssets
Namespace Prefix: | ed_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Tax Cuts And Jobs Act Of 2017, Change In Tax Rate, Regulatory Liabilities, Income Tax Benefit + References No definition available. + Details
Name: | ed_TaxCutsAndJobsActOf2017ChangeInTaxRateRegulatoryLiabilitiesIncomeTaxBenefit
Namespace Prefix: | ed_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Tax Cuts And Jobs Act Of 2017, Income Tax Credit + References No definition available. + Details
Name: | ed_TaxCutsAndJobsActOf2017IncomeTaxCredit
Namespace Prefix: | ed_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Tax Cuts And Jobs Act Of 2017, Income Tax Credit, Amortization Period + References No definition available. + Details
Name: | ed_TaxCutsAndJobsActOf2017IncomeTaxCreditAmortizationPeriod
Namespace Prefix: | ed_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tax Cuts And Jobs Act Of 2017, Net Benefit Amortization, Allocation Period + References No definition available. + Details
Name: | ed_TaxCutsAndJobsActOf2017NetBenefitAmortizationAllocationPeriod
Namespace Prefix: | ed_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Utilities Operating Expense, Food And Medicine Spoilage Expense + References No definition available. + Details
Name: | ed_UtilitiesOperatingExpenseFoodAndMedicineSpoilageExpense
Namespace Prefix: | ed_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from contract modification which increases (decreases) right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 + Details
Name: | us-gaap_ContractWithCustomerAssetCumulativeCatchUpAdjustmentToRevenueModificationOfContract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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=121557415&loc=d3e14326-108349 + Details
Name: | us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14557-108349 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12021-110248 + Details
Name: | us-gaap_LossContingencyEstimateOfPossibleLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The total number of new claims filed pertaining to a loss contingency during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349 + Details
Name: | us-gaap_LossContingencyNewClaimsFiledNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
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_PublicUtilitiesGeneralDisclosuresLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Discloses the amount of construction work in process that is included in the rate making process at period end. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAmountOfConstructionWorkInProcessIncludedInRateBase
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition A noncash adjustment to the provision established for storm damage by an oil, gas, or utility company. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
Name: | us-gaap_StormDamageProvision
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of operating expense for routine plant maintenance, repairs and operations of regulated operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(b)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
Name: | us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=ed_ConsolidatedEdisonCompanyofNewYorkInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAgencyAxis=ed_NYSPSCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | srt_ProductOrServiceAxis=ed_SteamMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilityAxis=us-gaap_ElectricTransmissionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=ed_ManhattanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=ed_BrooklynMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=ed_TropicalStormMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryLiabilityAxis=ed_ProtectedPortionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryLiabilityAxis=ed_UnprotectedPortionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilityAxis=us-gaap_GasTransmissionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_PublicUtilityAxis=ed_ElectricAndGasTransmissionProjectsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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