XML 131 R106.htm IDEA: XBRL DOCUMENT
v3.20.4

Material Contingencies - Total Guarantees (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | $ 2,042 | $ 1,831
Con Edison Transmission |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 570 |
Energy transactions |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 753 |
Renewable electric production projects |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 649 |
Other |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 70 |
0 – 3 years |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 1,228 |
0 – 3 years | Con Edison Transmission |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 393 |
0 – 3 years | Energy transactions |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 480 |
0 – 3 years | Renewable electric production projects |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 285 |
0 – 3 years | Other |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 70 |
4 – 10 years |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 237 |
4 – 10 years | Con Edison Transmission |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 177 |
4 – 10 years | Energy transactions |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 51 |
4 – 10 years | Renewable electric production projects |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 9 |
4 – 10 years | Other |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 0 |
> 10 years |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 577 |
> 10 years | Con Edison Transmission |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 0 |
> 10 years | Energy transactions |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 222 |
> 10 years | Renewable electric production projects |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | 355 |
> 10 years | Other |  |
Guarantor Obligations [Line Items] |  |
Total guarantees, by type and term | $ 0 |

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

X
- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12069-110248 + Details
Name: | us-gaap_GuaranteeObligationsMaximumExposure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=ed_ConEdisonTransmissionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=ed_FinancialAndPerformanceGuaranteeForCommodityTransactionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=ed_FinancialAndPerformanceGuaranteeForRenewableElectricProductionProjectsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=ed_FinancialAndPerformanceGuaranteeOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ed_GuarantorObligationsTermAxis=ed_GuaranteeDurationOneToThreeYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ed_GuarantorObligationsTermAxis=ed_GuaranteeDurationGreaterThanTenYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ed_GuarantorObligationsTermAxis=ed_GuaranteeDurationFourToTenYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |