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Current Expected Credit Losses - Rollforward of Segment Type (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Reserve adjustments | $ 34 | $ (78)
Accounts receivable - customers |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 360 | 322
Recoveries | 14 | 4
Write-offs | (66) | (48)
Reserve adjustments | 86 | (34)
Ending Balance | 394 | 244
Other receivables |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 13 | 10
Recoveries | 0 | 0
Write-offs | 0 | (1)
Reserve adjustments | 4 | 1
Ending Balance | 17 | 10
CECONY |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Reserve adjustments | 30 | (78)
CECONY | Accounts receivable - customers | Subsidiaries |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 353 | 314
Recoveries | 11 | 4
Write-offs | (62) | (47)
Reserve adjustments | 81 | (35)
Ending Balance | 383 | 236
CECONY | Other receivables | Subsidiaries |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 9 | 7
Recoveries | 0 | 0
Write-offs | 0 | 0
Reserve adjustments | 3 | 1
Ending Balance | $ 12 | $ 8

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