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Summary of Significant Accounting Policies and Other Matters - Adoption of New Standard (Details) | 3 Months Ended
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Mar. 31, 2020 USD ($)
Accounting Policies [Abstract] |
Increase in allowance for uncollectible accounts resulting from COVID-19 pandemic | $ 5,000,000
Accounts receivable - customers |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |
Beginning Balance | 70
Recoveries | 2
Write-offs | (18)
Reserve adjustments | 21
Ending Balance | 75
Other receivables |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |
Beginning Balance | 4
Recoveries | 0
Write-offs | 0
Reserve adjustments | 1
Ending Balance | 5
CECONY | Accounts receivable - customers |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |
Beginning Balance | 65
Recoveries | 2
Write-offs | (18)
Reserve adjustments | 21
Ending Balance | 70
CECONY | Other receivables |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |
Beginning Balance | 3
Recoveries | 0
Write-offs | 0
Reserve adjustments | 0
Ending Balance | $ 3

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