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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