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Environmental Matters - Environmental Remediation Costs (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Environmental Exit Cost [Line Items] |  |
Remediation costs incurred | $ 21 | $ 25
Environmental Remediation Expense, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Nonoperating Expense | Other Nonoperating Expense
CECONY |  |
Environmental Exit Cost [Line Items] |  |
Remediation costs incurred | $ 20 | $ 24
Environmental Remediation Expense, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Nonoperating Expense | Other Nonoperating Expense

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- Definition The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 55 -Paragraph 11 -URI https://asc.fasb.org/extlink&oid=6571209&loc=d3e13644-110860 Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 45 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=109237650&loc=d3e13064-110858 Reference 3: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 12 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859 + Details
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