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Regulatory Matters - Summary of Utilities Rate Plans (CECONY-Gas) (Details) - USD ($) | 1 Months Ended | 12 Months Ended | 36 Months Ended
--- | --- | --- | ---
Nov. 30, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2025 | Dec. 31, 2022
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Cost of services provided |  | $ 14,663,000,000 | $ 15,670,000,000 | $ 13,676,000,000 |  |  |
Deferred regulatory liabilities |  | 0 | 3,000,000 | 7,000,000 | $ 41,000,000 |  | $ 3,000,000
CECONY |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Cost of services provided |  | 13,476,000,000 | 13,268,000,000 | 11,716,000,000 |  |  |
CECONY | Gas |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Percentage of revenue reserve |  |  |  |  |  |  | 15.00%
Other earnings incentives |  | 5,000,000 | 8,000,000 | 26,000,000 | 3,000,000 |  |
Deferred regulatory liabilities |  | 162,000,000 | 141,000,000 | 100,000,000 | 27,000,000 |  | $ 141,000,000
Negative revenue adjustments |  |  | 8,000,000 | 3,000,000 | 3,000,000 |  |
Cost reconciliation, deferred net regulatory liabilities |  | 12,000,000 | 70,000,000 | 14,000,000 | 91,000,000 |  | 70,000,000
Deferred regulatory asset (liability) |  | (15,500,000) | 10,800,000 | $ (26,000,000) | (24,700,000) |  | $ 10,800,000
Authorized return on common equity (percent) |  |  |  |  |  |  | 8.80%
Earnings sharing (percent) |  |  |  | 9.30% |  |  |
Earnings sharing, threshold limit |  |  | 0 | $ 0 | 0 |  |
CECONY | Gas | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Percentage of revenue reserve |  |  |  |  |  | 15.00% |
Earnings sharing (percent) |  |  |  |  |  | 9.75% |
Common equity ratio (percent) |  |  |  |  |  | 48.00% |
CECONY | Gas | Maximum |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Amount of revenues retained |  |  | 65,000,000 |  |  |  | $ 65,000,000
CECONY | Gas | Maximum | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Amount of revenues retained |  |  |  |  |  | $ 65,000,000 |
CECONY | Gas | Gas Leak Backlog, Leak Prone Pipe and Service Terminations |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Cost of services provided |  | $ 3,000,000 | $ 9,000,000 | 7,000,000 | $ 13,000,000 |  |
CECONY | Gas | Service Termination |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Incentives reversed |  |  |  | 6,000,000 |  |  |
CECONY | Gas | Rate Plan for Year 1 |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  | 84,000,000
Amortizations to income of net regulatory (assets) and liabilities |  |  |  |  |  |  | 45,000,000
Potential incentives if performance targets are met |  |  |  |  |  |  | 20,000,000
Potential penalties (annually) |  |  |  |  |  |  | 81,000,000
Weighted average cost of capital (after-tax) |  |  |  |  |  |  | $ 7,171,000,000
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  |  | 6.61%
Actual return on common equity (percent) |  |  |  |  |  |  | 8.40%
Cost of long-term debt rate |  |  | 4.63% |  |  |  | 4.63%
CECONY | Gas | Rate Plan for Year 1 | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  | 217,000,000 |
Amortizations to income of net regulatory (assets) and liabilities |  |  |  |  |  | 31,000,000 |
Potential incentives if performance targets are met |  |  |  |  |  | 18,000,000 |
Potential penalties (annually) |  |  |  |  |  | 107,000,000 |
Weighted average cost of capital (after-tax) |  |  |  |  |  | $ 9,647,000,000 |
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  | 6.75% |
Authorized return on common equity (percent) |  |  |  |  |  | 9.25% |
Actual return on common equity (percent) |  |  |  |  |  | 9.00% |
Cost of long-term debt rate |  |  |  |  |  | 4.46% |
CECONY | Gas | Rate Plan for Year 1 | Gas average excluding AMI |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Average rate base |  |  |  |  |  |  | $ 8,108,000,000
CECONY | Gas | Rate Plan for Year 1 | Gas average excluding AMI | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Average rate base |  |  |  |  |  | $ 10,466,000,000 |
CECONY | Gas | Rate Plan for Year 1 | AMI |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Average rate base |  |  |  |  |  |  | 142,000,000
CECONY | Gas | Rate Plan for Year 1 | AMI | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Average rate base |  |  |  |  |  | 234,000,000 |
CECONY | Gas | Rate Plan for Year 1 | Customer Service Systems (CSS) | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Average rate base |  |  |  |  |  | 2,000,000 |
CECONY | Gas | Rate Plan for Year 2 |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  | 122,000,000
Amortizations to income of net regulatory (assets) and liabilities |  |  |  |  |  |  | 43,000,000
Potential incentives if performance targets are met |  |  |  |  |  |  | 22,000,000
Potential penalties (annually) |  |  |  |  |  |  | 88,000,000
Weighted average cost of capital (after-tax) |  |  |  |  |  |  | $ 7,911,000,000
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  |  | 6.61%
Actual return on common equity (percent) |  |  |  |  |  |  | 8.48%
Cost of long-term debt rate |  |  | 4.63% |  |  |  | 4.63%
CECONY | Gas | Rate Plan for Year 2 | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  | 173,000,000 |
Amortizations to income of net regulatory (assets) and liabilities |  |  |  |  |  | 24,000,000 |
Potential incentives if performance targets are met |  |  |  |  |  | 20,000,000 |
Potential penalties (annually) |  |  |  |  |  | 119,000,000 |
Weighted average cost of capital (after-tax) |  |  |  |  |  | $ 10,428,000,000 |
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  | 6.79% |
Cost of long-term debt rate |  |  |  |  |  | 4.54% |
CECONY | Gas | Rate Plan for Year 2 | Gas average excluding AMI |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Average rate base |  |  |  |  |  |  | $ 8,808,000,000
CECONY | Gas | Rate Plan for Year 2 | Gas average excluding AMI | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Average rate base |  |  |  |  |  | $ 11,442,000,000 |
CECONY | Gas | Rate Plan for Year 2 | AMI |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Average rate base |  |  |  |  |  |  | 183,000,000
CECONY | Gas | Rate Plan for Year 3 |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  | 167,000,000
Amortizations to income of net regulatory (assets) and liabilities |  |  |  |  |  |  | 10,000,000
Potential incentives if performance targets are met |  |  |  |  |  |  | 25,000,000
Potential penalties (annually) |  |  |  |  |  |  | 96,000,000
Weighted average cost of capital (after-tax) |  |  |  |  |  |  | $ 8,622,000,000
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  |  | 6.61%
Actual return on common equity (percent) |  |  |  |  |  |  | 8.93%
Cost of long-term debt rate |  |  | 4.63% |  |  |  | 4.63%
CECONY | Gas | Rate Plan for Year 3 | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  | 122,000,000 |
Amortizations to income of net regulatory (assets) and liabilities |  |  |  |  |  | (11,000,000) |
Potential incentives if performance targets are met |  |  |  |  |  | 21,000,000 |
Potential penalties (annually) |  |  |  |  |  | 130,000,000 |
Weighted average cost of capital (after-tax) |  |  |  |  |  | $ 11,063,000,000 |
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  | 6.85% |
Cost of long-term debt rate |  |  |  |  |  | 4.64% |
CECONY | Gas | Rate Plan for Year 3 | Gas average excluding AMI |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Average rate base |  |  |  |  |  |  | $ 9,510,000,000
CECONY | Gas | Rate Plan for Year 3 | Gas average excluding AMI | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Average rate base |  |  |  |  |  | $ 12,142,000,000 |
CECONY | Gas | Rate Plan for Year 3 | AMI |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Average rate base |  |  |  |  |  |  | 211,000,000
NYSPSC | CECONY | Gas |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Actual return on common equity (percent) |  |  |  |  | 8.56% |  |
Amount of cost recovery | $ 7,000,000 |  |  | $ 11,000,000 |  |  |
Annually | CECONY | Gas |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Income tax benefit to be credited to customers resulting from TCJA |  |  |  |  |  |  | 32,000,000
Annually | CECONY | Gas | Rate Plan for Year 1 | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Income tax benefit to be credited to customers resulting from TCJA |  |  |  |  |  | 16,000,000 |
Annually | CECONY | Gas | Rate Plan for Year 2 | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Income tax benefit to be credited to customers resulting from TCJA |  |  |  |  |  | 16,000,000 |
Over Ten Years | CECONY | Gas | Rate Plan for Year 1 |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  |  | 47,000,000
Amount of cost recovery |  |  |  |  |  |  | 30,000,000
Over Ten Years | CECONY | Gas | Rate Plan for Year 2 |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  |  | 176,000,000
Amount of cost recovery |  |  |  |  |  |  | 37,000,000
Over Ten Years | CECONY | Gas | Rate Plan for Year 3 |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  |  | 170,000,000
Amount of cost recovery |  |  |  |  |  |  | 40,000,000
Over Two Years | CECONY | Gas |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Income tax benefit to be credited to customers resulting from TCJA |  |  |  |  |  |  | 63,000,000
Over Two Years | CECONY | Gas | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Income tax benefit to be credited to customers resulting from TCJA |  |  |  |  |  | 32,000,000 |
Over Fifteen Years | CECONY | Gas | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Shortfall in revenue |  |  |  |  |  | 99,000,000 |
Over Fifteen Years | CECONY | Gas | Rate Plan for Year 1 | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  | 187,000,000 |
Amount of cost recovery |  |  |  |  |  | 45,000,000 |
Over Fifteen Years | CECONY | Gas | Rate Plan for Year 2 | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  | 187,000,000 |
Amount of cost recovery |  |  |  |  |  | 78,000,000 |
Over Fifteen Years | CECONY | Gas | Rate Plan for Year 3 | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  | 187,000,000 |
Amount of cost recovery |  |  |  |  |  | 62,000,000 |
Protected Portion | CECONY | Gas |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  | 725,000,000
Protected Portion | CECONY | Gas | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  | 679,000,000 |
Protected Portion | CECONY | Gas | Rate Plan for Year 1 |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  | 14,000,000
Protected Portion | CECONY | Gas | Rate Plan for Year 1 | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  | 9,000,000 |
Protected Portion | CECONY | Gas | Rate Plan for Year 2 |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  | 14,000,000
Protected Portion | CECONY | Gas | Rate Plan for Year 2 | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  | 10,000,000 |
Protected Portion | CECONY | Gas | Rate Plan for Year 3 |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  | 12,000,000
Protected Portion | CECONY | Gas | Rate Plan for Year 3 | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  | 10,000,000 |
Unprotected Portion | Annually | CECONY | Gas |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  | 21,000,000
Unprotected Portion | Annually | CECONY | Gas | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  | 21,000,000 |
Unprotected Portion | Over Two Years | CECONY | Gas | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  | $ 42,000,000 |
Unprotected Portion | Over Five Years | CECONY | Gas |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  | $ 107,000,000

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