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Electricity and Gas Purchase Agreements - Summary of Estimated Capacity and Other Fixed Payments (Details) $ in Millions | Dec. 31, 2022 USD ($)
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Long-term Contract for Purchase of Electric Power [Line Items] |
2023 |
2024 |
2025 |
2026 |
2027 |
All Years Thereafter |
Electricity power purchase agreements |
Long-term Contract for Purchase of Electric Power [Line Items] |
2023 | 121
2024 | 90
2025 | 64
2026 | 58
2027 | 44
All Years Thereafter | 390
Natural gas |
Long-term Contract for Purchase of Electric Power [Line Items] |
2023 | 679
2024 | 9
2025 | 0
2026 | 0
2027 | 0
All Years Thereafter | 0
Gas transportation and storage |
Long-term Contract for Purchase of Electric Power [Line Items] |
2023 | 471
2024 | 558
2025 | 484
2026 | 454
2027 | 369
All Years Thereafter | 3,164
CECONY |
Long-term Contract for Purchase of Electric Power [Line Items] |
2023 |
2024 |
2025 |
2026 |
2027 |
All Years Thereafter |
CECONY | Electricity power purchase agreements |
Long-term Contract for Purchase of Electric Power [Line Items] |
2023 | 121
2024 | 90
2025 | 64
2026 | 58
2027 | 44
All Years Thereafter | 390
CECONY | Natural gas |
Long-term Contract for Purchase of Electric Power [Line Items] |
2023 | 603
2024 | 8
2025 | 0
2026 | 0
2027 | 0
All Years Thereafter | 0
CECONY | Gas transportation and storage |
Long-term Contract for Purchase of Electric Power [Line Items] |
2023 | 412
2024 | 488
2025 | 424
2026 | 397
2027 | 323
All Years Thereafter | $ 2,762

X
- Definition Amount of contractual obligation to be paid after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
Name: | us-gaap_ContractualObligationDueInFifthYear
Namespace Prefix: | us-gaap_
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X
- Definition Amount of contractual obligation to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of contractual obligation to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ed_AgreementAxis=ed_NaturalGasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ed_AgreementAxis=ed_GasTransportationAndStorageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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