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Summary of Significant Accounting Policies and Other Matters - Adoption of New Standard (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Increase in allowance for uncollectible accounts resulting from COVID-19 pandemic | $ 31 | $ 48
Accounts receivable - customers |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 87 | 70
Recoveries | 2 | 6
Write-offs | (4) | (37)
Reserve adjustments | 33 | 79
Ending Balance | 118 | 118
Other receivables |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 5 | 4
Recoveries | 0 | 0
Write-offs | 0 | (1)
Reserve adjustments | 1 | 3
Ending Balance | 6 | 6
CECONY |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Increase in allowance for uncollectible accounts resulting from COVID-19 pandemic | 30 | 46
CECONY | Accounts receivable - customers |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 81 | 65
Recoveries | 2 | 6
Write-offs | (3) | (35)
Reserve adjustments | 31 | 75
Ending Balance | 111 | 111
CECONY | Other receivables |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 3 | 3
Recoveries | 0 | 0
Write-offs | 0 | 0
Reserve adjustments | 1 | 1
Ending Balance | $ 4 | $ 4

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