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Summary of Significant Accounting Policies and Other Matters - Adoption of New Standard (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Increase in allowance for uncollectible accounts resulting from COVID-19 pandemic | $ 78
Accounts receivable - customers |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |
Beginning Balance | 70
Recoveries | 8
Write-offs | (54)
Reserve adjustments | 124
Ending Balance | 148
Other receivables |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |
Beginning Balance | 4
Recoveries | 0
Write-offs | (2)
Reserve adjustments | 5
Ending Balance | 7
CECONY |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Increase in allowance for uncollectible accounts resulting from COVID-19 pandemic | 73
CECONY | Accounts receivable - customers |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |
Beginning Balance | 65
Recoveries | 6
Write-offs | (50)
Reserve adjustments | 117
Ending Balance | 138
CECONY | Other receivables |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |
Beginning Balance | 3
Recoveries | 0
Write-offs | (1)
Reserve adjustments | 2
Ending Balance | $ 4

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