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Summary of Significant Accounting Policies and Other Matters - Adoption of New Standard (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Increase in allowance for uncollectible accounts resulting from COVID-19 pandemic | $ 12 | $ 18
Accounts receivable - customers |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 75 | 70
Recoveries | 2 | 4
Write-offs | (15) | (34)
Reserve adjustments | 25 | 47
Ending Balance | 87 | 87
Other receivables |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 5 | 4
Recoveries | 0 | 0
Write-offs | (1) | (1)
Reserve adjustments | 1 | 2
Ending Balance | 5 | 5
CECONY |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Increase in allowance for uncollectible accounts resulting from COVID-19 pandemic | 11 | 16
CECONY | Accounts receivable - customers |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 70 | 65
Recoveries | 2 | 4
Write-offs | (14) | (32)
Reserve adjustments | 23 | 44
Ending Balance | 81 | 81
CECONY | Other receivables |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning Balance | 3 | 3
Recoveries | 0 | 0
Write-offs | 0 | (1)
Reserve adjustments | 0 | 1
Ending Balance | $ 3 | $ 3

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