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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2024
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of Change in Asset Retirement Obligation | The following table represents the balance of asset retirement obligations as of December 31, 2024 and 2023, and changes to the obligation for the years then ended:
| Con Edison | CECONY
(Millions of Dollars) | 2024 | (a) | 2023 | 2024 | 2023
Beginning Balance as of January 1, | $522 |  | $500 | $520 | $499
Changes in estimated cash flows | (21) |  | 76 | (21) | 75
Accretion expense | 20 |  | 17 | 20 | 17
Liabilities settled | (68) |  | (71) | (67) | (71)
Ending Balance as of December 31, (b) | $453 |  | $522 | $452 | $520
(a)The asset retirement obligations of Broken Bow II in 2023 and 2024 are reflected in current liabilities held for sale on Con Edison's consolidated balance sheets as of December 31, 2023 and 2024, respectively. On March 1, 2023, Con Edison completed the sale of all of the stock of the Clean Energy Businesses. For 2023 and 2024, $3 million of asset retirement obligations related to Broken Bow II are not shown in the table above, as they are already excluded from the beginning balance as of January 1, 2023 and January 1, 2024 for Con Edison. Broken Bow II was sold and transferred in January 2025. See Note A, Note W, and Note X. (b)At December 31, 2024, Con Edison and CECONY recorded reductions of $85 million and $84 million, respectively, to the regulatory liability associated with cost of removal to reflect depreciation and interest expense. At December 31, 2023, Con Edison and CECONY recorded reductions of $77 million to the regulatory liability associated with cost of removal to reflect depreciation and interest expense.

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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