XML 102 R84.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Capitalization - Significant Debt Covenants (Details) | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($)
Debt Instrument [Line Items] |
Maximum ratio of consolidated debt to consolidated total capital | 0.51
CECONY |
Debt Instrument [Line Items] |
Maximum ratio of consolidated debt to consolidated total capital | 0.53
Term Loan |
Debt Instrument [Line Items] |
Debt instrument, face amount | $ 825,000,000
Debt term | 2 years
Maximum ratio of consolidated debt to consolidated total capital | 0.65
Covenant principal balance amount limit | $ 150,000,000
Term Loan | CECONY |
Debt Instrument [Line Items] |
Covenant principal balance amount limit | $ 150,000,000
Notes |
Debt Instrument [Line Items] |
Maximum ratio of consolidated debt to consolidated total capital | 0.675
Covenant principal balance amount limit | $ 100,000,000
Notes | CECONY |
Debt Instrument [Line Items] |
Covenant principal balance amount limit | 100,000,000
Tax-Exempt Debt | CECONY |
Debt Instrument [Line Items] |
Debt instrument, face amount | $ 450,000,000
Maximum ratio of consolidated debt to consolidated total capital | 0.65

X
- Definition Covenant principal balance amount limit + References No definition available. + Details
Name: | ed_CovenantPrincipalBalanceAmountLimit
Namespace Prefix: | ed_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
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_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Indebtedness divided by net capital. + References No definition available. + Details
Name: | us-gaap_RatioOfIndebtednessToNetCapital1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=ed_TermLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_NotesPayableToBanksMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=ed_TaxExemptDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |