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Current Expected Credit Losses (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Increase in allowance for uncollectible accounts resulting from COVID-19 pandemic | $ 169 | $ 78 |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Reserve adjustments | 169 | 78 | $ 8
Accounts receivable - customers |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance at January 1, | 148 | 70 |
Recoveries | 14 | 8 |
Write-offs | (91) | (54) |
Reserve adjustments | 246 | 124 |
Ending Balance December 31, | 317 | 148 | 70
Other receivables |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance at January 1, | 7 | 4 |
Recoveries | 1 | 0 |
Write-offs | (2) | (2) |
Reserve adjustments | 16 | 5 |
Ending Balance December 31, | 22 | 7 | 4
CECONY |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Increase in allowance for uncollectible accounts resulting from COVID-19 pandemic | 166 | 73 |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Reserve adjustments | 166 | 74 | 7
CECONY | Accounts receivable - customers | Subsidiaries |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance at January 1, | 138 | 65 |
Recoveries | 12 | 6 |
Write-offs | (86) | (50) |
Reserve adjustments | 240 | 117 |
Ending Balance December 31, | 304 | 138 | 65
CECONY | Other receivables | Subsidiaries |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance at January 1, | 4 | 3 |
Recoveries | 1 | 0 |
Write-offs | (1) | (1) |
Reserve adjustments | 15 | 2 |
Ending Balance December 31, | $ 19 | $ 4 | $ 3

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