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Other Postretirement Benefits - Schedule of Plan Assets Allocations (Details) - Other Postretirement Benefits - CECONY | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation Range (percent) | 100.00% |  |
Plan Assets Percentage (percent) | 100.00% | 100.00% | 100.00%
Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets Percentage (percent) | 44.00% | 49.00% | 55.00%
Equity Securities | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation Range (percent) | 35.00% |  |
Equity Securities | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation Range (percent) | 55.00% |  |
Debt Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets Percentage (percent) | 51.00% | 51.00% | 45.00%
Debt Securities | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation Range (percent) | 40.00% |  |
Debt Securities | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation Range (percent) | 60.00% |  |
Real Estate and Other Alternatives |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan Assets Percentage (percent) | 5.00% | 0.00% | 0.00%
Real Estate and Other Alternatives | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation Range (percent) | 0.00% |  |
Real Estate and Other Alternatives | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation Range (percent) | 9.00% |  |

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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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