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Regulatory Matters - Summary of Utilities Rate Plans (CECONY - Steam) (Details) - Steam - CECONY $ in Millions | 9 Months Ended | 36 Months Ended
--- | --- | ---
Sep. 30, 2023 USD ($) | Oct. 31, 2026 USD ($)
Public Utilities, General Disclosures [Line Items] |  |
Annual cap of surcharge recoveries | 0.005 |
Property tax deferrals rate difference (in percent) | 90.00% |
Recovery deferral (percent) | 80.00% |
Maximum deferral (percent) | 30.00% |
Scenario, Forecast | Subsequent Event |  |
Public Utilities, General Disclosures [Line Items] |  |
Authorized return on common equity (percent) |  | 9.25%
Earnings sharing (percent) |  | 9.75%
Common equity ratio (percent) |  | 48.00%
Unprotected Portion |  |
Public Utilities, General Disclosures [Line Items] |  |
Impact in regulatory liability resulting from TCJA | $ 24.0 |
Year 1 |  |
Public Utilities, General Disclosures [Line Items] |  |
Requested rate increase (decrease), amount | 77.8 |
Late payment charges and fees | $ 2.5 |
Deferral, annual maximum (not more than) (percent) | 0.10% |
Year 1 | Scenario, Forecast | Subsequent Event |  |
Public Utilities, General Disclosures [Line Items] |  |
Base rate changes |  | $ 110.0
Capital expenditures |  | 106.0
Amortization to income of net regulatory (assets) and liabilities |  | 15.0
Negative revenue adjustments |  | 3.7
Net utility plant reconciliations |  | $ 2,025.0
Weighted average cost of capital (after-tax) (percent) |  | 6.78%
Cost of long-term debt (percent) |  | 4.51%
Average rate base |  | $ 1,799.0
Year 1 | Protected Portion |  |
Public Utilities, General Disclosures [Line Items] |  |
Impact in regulatory liability resulting from TCJA | $ 3.0 |
Non-plant regulatory asset | 11.0 |
Year 2 |  |
Public Utilities, General Disclosures [Line Items] |  |
Requested rate increase (decrease), amount | 77.8 |
Late payment charges and fees | $ 3.0 |
Deferral, annual maximum (not more than) (percent) | 0.075% |
Year 2 | Scenario, Forecast | Subsequent Event |  |
Public Utilities, General Disclosures [Line Items] |  |
Base rate changes |  | 44.0
Capital expenditures |  | 107.0
Amortization to income of net regulatory (assets) and liabilities |  | 3.0
Negative revenue adjustments |  | 3.8
Net utility plant reconciliations |  | $ 2,029.0
Weighted average cost of capital (after-tax) (percent) |  | 6.81%
Cost of long-term debt (percent) |  | 4.58%
Average rate base |  | $ 1,848.0
Year 2 | Protected Portion |  |
Public Utilities, General Disclosures [Line Items] |  |
Impact in regulatory liability resulting from TCJA | $ 5.0 |
Year 3 |  |
Public Utilities, General Disclosures [Line Items] |  |
Requested rate increase (decrease), amount | 77.8 |
Late payment charges and fees | $ 3.5 |
Deferral, annual maximum (not more than) (percent) | 0.05% |
Year 3 | Scenario, Forecast | Subsequent Event |  |
Public Utilities, General Disclosures [Line Items] |  |
Base rate changes |  | 45.0
Capital expenditures |  | 105.0
Amortization to income of net regulatory (assets) and liabilities |  | 3.0
Negative revenue adjustments |  | 3.8
Net utility plant reconciliations |  | $ 2,015.0
Weighted average cost of capital (after-tax) (percent) |  | 6.83%
Cost of long-term debt (percent) |  | 4.62%
Average rate base |  | $ 1,882.0
Year 3 | Protected Portion |  |
Public Utilities, General Disclosures [Line Items] |  |
Impact in regulatory liability resulting from TCJA | $ 6.0 |

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