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Leases - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Lessee, Lease, Description [Line Items] |  |  |  |  |
Assets under finance leases | $ 2 |  | $ 2 |  | $ 2
Finance leases, accumulated amortization | 1 |  | 1 |  | 5
Right-of-use assets | 1 | $ 2 | 2 | $ 46 |
CECONY |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Assets under finance leases | 1 |  | 1 |  | 1
Finance leases, accumulated amortization | 1 |  | 1 |  | $ 2
CECONY | Subsidiaries |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |
Right-of-use assets | $ 1 | $ 1 | $ 2 | $ 1 |

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- Definition Direct Financing Lease, Accumulated Amortization + References No definition available. + Details
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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 -Topic 842 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479773/842-30-50-3 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-3 + Details
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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 -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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- Details
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