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Leases - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Lessee, Lease, Description [Line Items] |  |  |  |
Assets under finance leases | $ 3 | $ 3 |  | $ 1
Finance leases, accumulated amortization | 3 | 3 |  | 5
Right-of-use assets | 8 | 13 |  |
CECONY |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Assets under finance leases | 2 | 2 |  |
Finance leases, accumulated amortization | 1 | $ 1 |  | $ 3
Right-of-use assets | $ 2 |  | $ 3 |

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- Definition Direct Financing Lease, Accumulated Amortization + References No definition available. + Details
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Namespace Prefix: | ed_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of residual asset covered by residual value guarantee under direct financing lease. Excludes guarantee considered to be lease payments for lessor. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=119202524&loc=SL77919359-209981 + Details
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Balance Type: | debit
Period Type: | instant

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- 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
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Balance Type: | na
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- Definition Amount of increase in right-of-use asset obtained in exchange for operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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Balance Type: | debit
Period Type: | duration

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- Details
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