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Electricity and Gas Purchase Agreements - Summary of Capacity, Energy and Other Fixed Payments (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Long-term Contract for Purchase of Electric Power [Line Items] |  |  |
Capacity, energy and other fixed payments | $ 546 | $ 596 | $ 552
Astoria Generating Company |  |  |
Long-term Contract for Purchase of Electric Power [Line Items] |  |  |
Capacity, energy and other fixed payments | 40 | 45 | 20
Brooklyn Navy Yard |  |  |
Long-term Contract for Purchase of Electric Power [Line Items] |  |  |
Capacity, energy and other fixed payments | 134 | 165 | 139
Gas transportation and storage |  |  |
Long-term Contract for Purchase of Electric Power [Line Items] |  |  |
Capacity, energy and other fixed payments | 372 | 386 | 393
CECONY |  |  |
Long-term Contract for Purchase of Electric Power [Line Items] |  |  |
Capacity, energy and other fixed payments | 501 | 550 | 506
CECONY | Astoria Generating Company |  |  |
Long-term Contract for Purchase of Electric Power [Line Items] |  |  |
Capacity, energy and other fixed payments | 40 | 45 | 20
CECONY | Brooklyn Navy Yard |  |  |
Long-term Contract for Purchase of Electric Power [Line Items] |  |  |
Capacity, energy and other fixed payments | 134 | 165 | 139
CECONY | Gas transportation and storage |  |  |
Long-term Contract for Purchase of Electric Power [Line Items] |  |  |
Capacity, energy and other fixed payments | $ 327 | $ 340 | $ 347

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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 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.D) -SubTopic 10 -Topic 980 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480114/980-10-S99-1 + Details
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