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Current Expected Credit Losses - Schedule of Major Portfolio Segment Type (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Reserve adjustments | $ 38 | $ 5 | $ 169
Accounts receivable - customers |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance at January 1, | 322 | 317 | 148
Recoveries | 14 | 17 | 14
Write-offs | (138) | (103) | (91)
Reserve adjustments | 162 | 91 | 246
Ending Balance December 31, | 360 | 322 | 317
Other receivables |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance at January 1, | 10 | 22 | 7
Recoveries | 0 | 0 | 1
Write-offs | (5) | (6) | (2)
Reserve adjustments | 8 | (6) | 16
Ending Balance December 31, | 13 | 10 | 22
CECONY |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Reserve adjustments | 39 | 10 | 166
CECONY | Accounts receivable - customers | Subsidiaries |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance at January 1, | 314 | 304 | 138
Recoveries | 12 | 16 | 12
Write-offs | (131) | (94) | (86)
Reserve adjustments | 158 | 88 | 240
Ending Balance December 31, | 353 | 314 | 304
CECONY | Other receivables | Subsidiaries |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance at January 1, | 7 | 19 | 4
Recoveries | 0 | 0 | 1
Write-offs | (3) | (4) | (1)
Reserve adjustments | 5 | (8) | 15
Ending Balance December 31, | $ 9 | $ 7 | $ 19

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