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Current Expected Credit Losses - Schedule of Major Portfolio Segment Type (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accounts receivable - customers |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance at January 1, | $ 360 | $ 322 | $ 317
Recoveries | 21 | 14 | 17
Write-offs | (250) | (138) | (103)
Reserve adjustments | 489 | 162 | 91
Ending Balance December 31, | 620 | 360 | 322
Other receivables |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance at January 1, | 13 | 10 | 22
Recoveries | 0 | 0 | 0
Write-offs | 0 | (5) | (6)
Reserve adjustments | 28 | 8 | (6)
Ending Balance December 31, | 41 | 13 | 10
CECONY | Accounts receivable - customers | Subsidiaries |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance at January 1, | 353 | 314 | 304
Recoveries | 17 | 12 | 16
Write-offs | (239) | (131) | (94)
Reserve adjustments | 474 | 158 | 88
Ending Balance December 31, | 605 | 353 | 314
CECONY | Other receivables | Subsidiaries |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance at January 1, | 9 | 7 | 19
Recoveries | 0 | 0 | 0
Write-offs | 0 | (3) | (4)
Reserve adjustments | 29 | 5 | (8)
Ending Balance December 31, | $ 38 | $ 9 | $ 7

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