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Current Expected Credit Losses (Tables)
 3 Months Ended
Mar. 31, 2025
Credit Loss [Abstract]  
Schedule of Rollforward of Allowance for Credit Losses
The table below presents a rollforward by major portfolio segment type for the three months ended March 31, 2025 and 2024:
For the Three Months Ended March 31,
Con EdisonCECONY
Accounts receivable - customersOther receivablesAccounts receivable - customersOther receivables
(Millions of Dollars)20252024202520242025202420252024
Allowance for credit losses
Beginning Balance at January 1, $620$360$41$13$605$353$38$9
Recoveries514——511——
Write-offs(98)(66)(4)—(96)(62)(4)—
Reserve adjustments8986(9)49181(9)3
Ending Balance March 31,$616$394$28$17$605$383$25$12