XML 102 R73.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Regulatory Matters - Summary of Utilities Rate Plans (CECONY-Gas) (Details) - USD ($) | 1 Months Ended | 12 Months Ended | 36 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2025 | Jan. 31, 2024 | Jan. 31, 2022 | Nov. 30, 2021 | Dec. 31, 2016 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2022 | Dec. 31, 2019 | Dec. 31, 2016 | Dec. 31, 2024 | Dec. 31, 2023
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  | $ 13,676,000,000 | $ 12,246,000,000 | $ 12,574,000,000 |  |  |  |  |  |  |
Deferred revenues |  |  |  |  |  | 7,000,000 | 41,000,000 | 17,000,000 | $ 20,000,000 |  |  | $ 17,000,000 |  |  |
CECONY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  | 11,716,000,000 | 10,647,000,000 | 10,821,000,000 |  |  |  |  |  |  |
CECONY | Gas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of revenue reserve |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |  |
Other earnings incentives |  |  |  |  |  | 26,000,000 | 3,000,000 | 7,000,000 | 6,000,000 | $ 7,000,000 |  |  |  |  |
Deferred revenues |  |  |  |  |  | 100,000,000 | 27,000,000 | 10,000,000 | 12,000,000 | 3,000,000 |  | $ 10,000,000 |  |  |
Negative revenue adjustments |  |  |  |  |  | 0 | 0 | 0 | 4,000,000 | 5,000,000 |  |  |  |  |
Cost reconciliation, deferred net regulatory liabilities |  |  |  |  |  | 14,000,000 | 91,000,000 | 18,000,000 | 44,000,000 | 2,000,000 |  | 18,000,000 |  |  |
Deferred regulatory asset (liability) |  |  |  |  |  | (26,000,000) | (24,700,000) | $ (1,700,000) | (2,200,000) | (2,200,000) |  | $ (1,700,000) |  |  |
Earnings sharing (percent) |  |  |  |  |  |  |  | 9.50% |  |  |  | 9.50% |  |  |
Earnings sharing, threshold limit |  |  |  |  |  | 0 | 0 | $ 0 | 0 | 0 |  |  |  |  |
Common equity ratio, percentage |  |  |  |  |  |  |  |  |  |  |  | 48.00% |  |  |
Increase in gas base rate due to expiration of temporary credit under the prior rate plan |  |  |  |  | $ 41,000,000 |  |  |  |  |  |  |  |  |  |
CECONY | Gas | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  | $ 7,000,000 | 13,000,000 | 9,000,000 | 5,000,000 |  |  |  |  |  |
CECONY | Gas | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of revenue reserve |  |  |  |  |  |  |  |  |  |  | 15.00% |  |  |  |
Earnings sharing (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.30% |
Common equity ratio, percentage |  |  |  |  |  |  |  |  |  |  | 48.00% |  |  |  |
CECONY | Gas | Scenario, Forecast | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of revenues retained |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 65,000,000
CECONY | Gas | Year 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  |  |  |  |  |  | $ (5,000,000) |  |  |
Utilities operating expense, depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  | 39,000,000 |  |  |
Potential incentives if performance targets are met |  |  |  |  |  |  |  |  |  |  |  | 7,000,000 |  |  |
Potential penalties (annually) |  |  |  |  |  |  |  |  |  |  |  | 68,000,000 |  |  |
Average rate base |  |  |  |  |  |  |  |  |  |  |  | $ 4,841,000,000 |  |  |
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  |  |  |  |  |  |  | 6.82% |  |  |
Authorized return on common equity (percent) |  |  |  |  |  |  |  |  |  |  |  | 9.00% |  |  |
Actual return on common equity (percent) |  |  |  |  |  |  |  |  |  |  |  | 9.22% |  |  |
Cost of long-term debt rate |  |  |  |  |  | 4.93% |  |  |  |  |  |  |  |  |
CECONY | Gas | Year 1 | Gas average excluding AMI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  |  |  |  |  |  |  | $ 5,844,000,000 |  |  |
CECONY | Gas | Year 1 | AMI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  |  |  |  |  |  |  | 27,000,000 |  |  |
CECONY | Gas | Year 1 | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  |  |  |  |  | $ 84,000,000 |  |  |  |
Utilities operating expense, depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 45,000,000 |  |  |  |
Potential incentives if performance targets are met |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |  |  |
Potential penalties (annually) |  |  |  |  |  |  |  |  |  |  | 81,000,000 |  |  |  |
Average rate base |  |  |  |  |  |  |  |  |  |  | $ 7,171,000,000 |  |  |  |
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  |  |  |  |  |  | 6.61% |  |  |  |
Authorized return on common equity (percent) |  |  |  |  |  |  |  |  |  |  | 8.80% |  |  |  |
Actual return on common equity (percent) |  |  |  |  |  |  |  |  |  |  | 8.40% |  |  |  |
Cost of long-term debt rate |  |  |  |  |  |  |  |  |  |  | 4.63% |  |  |  |
CECONY | Gas | Year 1 | Scenario, Forecast | Gas average excluding AMI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  |  |  |  |  |  | $ 8,108,000,000 |  |  |  |
CECONY | Gas | Year 1 | Scenario, Forecast | AMI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  |  |  |  |  |  | 142,000,000 |  |  |  |
CECONY | Gas | Year 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  |  |  |  |  |  | 92,000,000 |  |  |
Utilities operating expense, depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  | 37,000,000 |  |  |
Potential incentives if performance targets are met |  |  |  |  |  |  |  |  |  |  |  | 8,000,000 |  |  |
Potential penalties (annually) |  |  |  |  |  |  |  |  |  |  |  | 63,000,000 |  |  |
Average rate base |  |  |  |  |  |  |  |  |  |  |  | $ 5,395,000,000 |  |  |
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  |  |  |  |  |  |  | 6.80% |  |  |
Actual return on common equity (percent) |  |  |  |  |  |  |  |  |  |  |  | 9.04% |  |  |
Cost of long-term debt rate |  |  |  |  |  | 4.88% |  |  |  |  |  |  |  |  |
CECONY | Gas | Year 2 | Gas average excluding AMI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  |  |  |  |  |  |  | $ 6,512,000,000 |  |  |
CECONY | Gas | Year 2 | AMI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  |  |  |  |  |  |  | 57,000,000 |  |  |
CECONY | Gas | Year 2 | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  |  |  |  |  | 122,000,000 |  |  |  |
Utilities operating expense, depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 43,000,000 |  |  |  |
Potential incentives if performance targets are met |  |  |  |  |  |  |  |  |  |  | 22,000,000 |  |  |  |
Potential penalties (annually) |  |  |  |  |  |  |  |  |  |  | 88,000,000 |  |  |  |
Average rate base |  |  |  |  |  |  |  |  |  |  | $ 7,911,000,000 |  |  |  |
Actual return on common equity (percent) |  |  |  |  |  |  |  |  |  |  | 8.48% |  |  |  |
CECONY | Gas | Year 2 | Scenario, Forecast | Gas average excluding AMI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  |  |  |  |  |  | $ 8,808,000,000 |  |  |  |
CECONY | Gas | Year 2 | Scenario, Forecast | AMI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  |  |  |  |  |  | 183,000,000 |  |  |  |
CECONY | Gas | Year 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  |  |  |  |  |  | 90,000,000 |  |  |
Utilities operating expense, depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  | 36,000,000 |  |  |
Potential incentives if performance targets are met |  |  |  |  |  |  |  |  |  |  |  | 8,000,000 |  |  |
Potential penalties (annually) |  |  |  |  |  |  |  |  |  |  |  | 70,000,000 |  |  |
Average rate base |  |  |  |  |  |  |  |  |  |  |  | $ 6,005,000,000 |  |  |
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  |  |  |  |  |  |  | 6.73% |  |  |
Actual return on common equity (percent) |  |  |  |  |  |  |  |  |  |  |  | 8.72% |  |  |
Cost of long-term debt rate |  |  |  |  |  | 4.74% |  |  |  |  |  |  |  |  |
CECONY | Gas | Year 3 | Gas average excluding AMI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  |  |  |  |  |  |  | $ 7,177,000,000 |  |  |
CECONY | Gas | Year 3 | AMI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |
CECONY | Gas | Year 3 | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  |  |  |  |  | 167,000,000 |  |  |  |
Utilities operating expense, depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |
Potential incentives if performance targets are met |  |  |  |  |  |  |  |  |  |  | 25,000,000 |  |  |  |
Potential penalties (annually) |  |  |  |  |  |  |  |  |  |  | 96,000,000 |  |  |  |
Average rate base |  |  |  |  |  |  |  |  |  |  | 8,622,000,000 |  |  |  |
CECONY | Gas | Year 3 | Scenario, Forecast | Gas average excluding AMI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  |  |  |  |  |  | 9,510,000,000 |  |  |  |
CECONY | Gas | Year 3 | Scenario, Forecast | AMI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  |  |  |  |  |  | $ 211,000,000 |  |  |  |
CECONY | Electric |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other earnings incentives |  |  |  |  |  |  |  | 5,000,000 | 5,000,000 | 5,000,000 |  |  |  |  |
Deferred revenues |  |  |  |  |  | $ 226,000,000 | 242,000,000 | 169,000,000 | (6,000,000) | 45,000,000 |  | 169,000,000 |  |  |
Negative revenue adjustments |  |  |  |  |  | 0 | 5,000,000 | 15,000,000 | 0 | 0 |  |  |  |  |
Cost reconciliation, deferred net regulatory liabilities |  |  |  |  |  | 191,000,000 | 288,000,000 | 10,000,000 | 189,000,000 | 35,000,000 |  | 10,000,000 |  |  |
Deferred regulatory asset (liability) |  |  |  |  |  | $ 3,200,000 | 4,100,000 | (11,800,000) | $ (400,000) | 400,000 |  | $ (11,800,000) |  |  |
Earnings sharing, threshold limit |  |  |  |  |  |  | $ 0 | $ 0 |  | $ 0 |  |  |  |  |
Common equity ratio, percentage |  |  |  |  |  |  |  |  |  |  |  | 48.00% |  |  |
Increase in gas base rate due to expiration of temporary credit under the prior rate plan |  |  |  |  | $ 48,000,000 |  |  |  |  |  |  |  |  |  |
CECONY | Electric | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized return on common equity (percent) |  |  |  |  |  |  |  |  |  |  | 8.80% |  |  |  |
Earnings sharing (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.30% |
Common equity ratio, percentage |  |  |  |  |  |  |  |  |  |  | 48.00% |  |  |  |
CECONY | Electric | Year 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Utilities operating expense, depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  | $ 84,000,000 |  |  |
Potential incentives if performance targets are met |  |  |  |  |  |  |  |  |  |  |  | 28,000,000 |  |  |
Average rate base |  |  |  |  |  |  |  |  |  |  |  | $ 18,902,000,000 |  |  |
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  |  |  |  |  |  |  | 6.82% |  |  |
Authorized return on common equity (percent) |  |  |  |  |  |  |  |  |  |  |  | 9.00% |  |  |
Actual return on common equity (percent) |  |  |  |  |  |  |  |  |  |  |  | 9.30% |  |  |
Earnings sharing (percent) |  |  |  |  |  | 9.50% |  |  |  |  |  |  |  |  |
Cost of long-term debt rate |  |  |  |  |  | 4.93% |  |  |  |  |  |  |  |  |
Deferral, annual maximum (not more than) (percent) |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |
Recovery of energy efficiency and savings program costs |  |  |  |  |  |  |  |  |  |  |  | $ 20,500,000 |  |  |
CECONY | Electric | Year 1 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential penalties (annually) |  |  |  |  |  |  |  |  |  |  |  | 376,000,000 |  |  |
CECONY | Electric | Year 1 | AMI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  |  |  |  |  |  |  | 126,000,000 |  |  |
CECONY | Electric | Year 1 | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Utilities operating expense, depreciation and amortization |  |  |  |  |  |  |  |  |  |  | $ 267,000,000 |  |  |  |
Potential incentives if performance targets are met |  |  |  |  |  |  |  |  |  |  | 69,000,000 |  |  |  |
Potential penalties (annually) |  |  |  |  |  |  |  |  |  |  | 450,000,000 |  |  |  |
Average rate base |  |  |  |  |  |  |  |  |  |  | $ 21,660,000,000 |  |  |  |
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  |  |  |  |  |  | 6.61% |  |  |  |
Actual return on common equity (percent) |  |  |  |  |  |  |  |  |  |  | 8.50% |  |  |  |
Cost of long-term debt rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.63% |
Amount of cost recovery |  |  |  |  |  |  |  |  |  |  | $ 206,000,000 |  |  |  |
CECONY | Electric | Year 1 | Scenario, Forecast | AMI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  |  |  |  |  |  | 572,000,000 |  |  |  |
CECONY | Electric | Year 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Utilities operating expense, depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  | 83,000,000 |  |  |
Potential incentives if performance targets are met |  |  |  |  |  |  |  |  |  |  |  | 47,000,000 |  |  |
Average rate base |  |  |  |  |  |  |  |  |  |  |  | $ 19,530,000,000 |  |  |
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  |  |  |  |  |  |  | 6.80% |  |  |
Actual return on common equity (percent) |  |  |  |  |  |  |  |  |  |  |  | 9.36% |  |  |
Cost of long-term debt rate |  |  |  |  |  | 4.88% |  |  |  |  |  |  |  |  |
Deferral, annual maximum (not more than) (percent) |  |  |  |  |  |  |  |  |  |  |  |  | 7.50% |  |
Recovery of energy efficiency and savings program costs |  |  |  |  |  |  |  |  |  |  |  | $ 49,000,000 |  |  |
CECONY | Electric | Year 2 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential penalties (annually) |  |  |  |  |  |  |  |  |  |  |  | 341,000,000 |  |  |
CECONY | Electric | Year 2 | AMI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  |  |  |  |  |  |  | 257,000,000 |  |  |
CECONY | Electric | Year 2 | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Utilities operating expense, depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 269,000,000 |  |  |  |
Potential incentives if performance targets are met |  |  |  |  |  |  |  |  |  |  | 74,000,000 |  |  |  |
Potential penalties (annually) |  |  |  |  |  |  |  |  |  |  | 461,000,000 |  |  |  |
Average rate base |  |  |  |  |  |  |  |  |  |  | $ 22,783,000,000 |  |  |  |
Actual return on common equity (percent) |  |  |  |  |  |  |  |  |  |  | 8.03% |  |  |  |
Amount of cost recovery |  |  |  |  |  |  |  |  |  |  | $ 245,000,000 |  |  |  |
CECONY | Electric | Year 2 | Scenario, Forecast | AMI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  |  |  |  |  |  | 740,000,000 |  |  |  |
CECONY | Electric | Year 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Utilities operating expense, depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  | 69,000,000 |  |  |
Potential incentives if performance targets are met |  |  |  |  |  |  |  |  |  |  |  | 64,000,000 |  |  |
Average rate base |  |  |  |  |  |  |  |  |  |  |  | $ 20,277,000,000 |  |  |
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  |  |  |  |  |  |  | 6.73% |  |  |
Actual return on common equity (percent) |  |  |  |  |  |  |  |  |  |  |  | 8.82% |  |  |
Cost of long-term debt rate |  |  |  |  |  | 4.74% |  |  |  |  |  |  |  |  |
Deferral, annual maximum (not more than) (percent) |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |
Recovery of energy efficiency and savings program costs |  |  |  |  |  |  |  |  |  |  |  | $ 107,500,000 |  |  |
CECONY | Electric | Year 3 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential penalties (annually) |  |  |  |  |  |  |  |  |  |  |  | 352,000,000 |  |  |
CECONY | Electric | Year 3 | AMI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  |  |  |  |  |  |  | $ 415,000,000 |  |  |
CECONY | Electric | Year 3 | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Utilities operating expense, depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 272,000,000 |  |  |  |
Potential incentives if performance targets are met |  |  |  |  |  |  |  |  |  |  | 79,000,000 |  |  |  |
Potential penalties (annually) |  |  |  |  |  |  |  |  |  |  | 476,000,000 |  |  |  |
Average rate base |  |  |  |  |  |  |  |  |  |  | 23,926,000,000 |  |  |  |
Amount of cost recovery |  |  |  |  |  |  |  |  |  |  | 251,000,000 |  |  |  |
CECONY | Electric | Year 3 | Scenario, Forecast | AMI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  |  |  |  |  |  | 806,000,000 |  |  |  |
NYSPSC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of total consolidated revenues |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |  |
NYSPSC | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of total consolidated revenues |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |  |
Percentage of debt to total consolidated debt |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |
NYSPSC | CECONY | Gas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actual return on common equity (percent) |  |  |  |  |  |  | 8.56% |  |  |  |  |  |  |  |
Amount of cost recovery |  |  |  | $ 7,000,000 |  | $ 4,000,000 | $ 7,000,000 |  |  |  |  |  |  |  |
NYSPSC | CECONY | Gas | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Utilities operating expense, depreciation and amortization |  |  | $ 48,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  | $ 503,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Return on common equity (percent) |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |
Common equity ratio |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |
NYSPSC | CECONY | Gas | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount | $ 218,000,000 | $ 234,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Return on common equity (percent) |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Common equity ratio |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |
NYSPSC | CECONY | Electric |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actual return on common equity (percent) |  |  |  |  |  |  | 8.81% |  |  |  |  |  |  |  |
Amount of cost recovery |  |  |  | $ 43,000,000 |  | $ 19,000,000 | $ 43,000,000 |  |  |  |  |  |  |  |
NYSPSC | CECONY | Electric | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  | $ 1,199,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Return on common equity (percent) |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |
Common equity ratio |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |
NYSPSC | CECONY | Electric | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount | $ 608,000,000 | $ 853,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Return on common equity (percent) |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Common equity ratio |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Annually | CECONY | Gas | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax benefit to be credited to customers resulting from TCJA |  |  |  |  |  |  |  |  |  |  | 32,000,000 |  |  |  |
Annually | CECONY | Electric | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax benefit to be credited to customers resulting from TCJA |  |  |  |  |  |  |  |  |  |  | 126,000,000 |  |  |  |
Over Ten Years | CECONY | Gas | Year 1 | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | Year 2 | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | Year 3 | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax benefit to be credited to customers resulting from TCJA |  |  |  |  |  |  |  |  |  |  | 63,000,000 |  |  |  |
Protected Portion | CECONY | Gas | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  |  |  | 725,000,000 |  |  |  |
Protected Portion | CECONY | Gas | Year 1 | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  |  |  | 14,000,000 |  |  |  |
Protected Portion | CECONY | Gas | Year 2 | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  |  |  | 14,000,000 |  |  |  |
Protected Portion | CECONY | Gas | Year 3 | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  |  |  | 12,000,000 |  |  |  |
Protected Portion | CECONY | Electric | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  |  |  | 1,663,000,000 |  |  |  |
Protected Portion | CECONY | Electric | Year 1 | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  |  |  | 49,000,000 |  |  |  |
Protected Portion | CECONY | Electric | Year 2 | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |
Protected Portion | CECONY | Electric | Year 3 | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  |  |  | 53,000,000 |  |  |  |
Unprotected Portion | CECONY | Electric | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  |  |  | $ 784,000,000 |  |  |  |
TCJA of 2017 regulatory liabilities, income tax benefit, amortization period |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |
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 | Annually | CECONY | Electric | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  |  |  | 157,000,000 |  |  |  |
Unprotected Portion | Over Five Years | CECONY | Gas | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  |  |  |  |  | $ 107,000,000 |  |  |  |

X
- Definition Deferred regulatory asset (liability) + References No definition available. + Details
Name: | ed_AverageNetUtilityPlantRates
Namespace Prefix: | ed_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Base rate increase decrease. + References No definition available. + Details
Name: | ed_BaseRateIncreaseDecrease
Namespace Prefix: | ed_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Common Equity Ratio, Percentage + References No definition available. + Details
Name: | ed_CommonEquityRatioPercentage
Namespace Prefix: | ed_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Deferred Regulatory Asset (Liability) + References No definition available. + Details
Name: | ed_DeferredRegulatoryAssetLiability
Namespace Prefix: | ed_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Impact On Earnings Had Lag Period Been Adjusted + References No definition available. + Details
Name: | ed_ImpactOnEarningsHadLagPeriodBeenAdjusted
Namespace Prefix: | ed_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Other Incentive Revenue + References No definition available. + Details
Name: | ed_OtherIncentiveRevenue
Namespace Prefix: | ed_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage of Revenue Reserve + References No definition available. + Details
Name: | ed_PercentageofRevenueReserve
Namespace Prefix: | ed_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Potential Earnings Adjustment Mechanism Incentive Revenue + References No definition available. + Details
Name: | ed_PotentialEarningsAdjustmentMechanismIncentiveRevenue
Namespace Prefix: | ed_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Potential Penalty Expense + References No definition available. + Details
Name: | ed_PotentialPenaltyExpense
Namespace Prefix: | ed_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Property Tax Deferrals Limitation From Rate, Annual Maximum + References No definition available. + Details
Name: | ed_PropertyTaxDeferralsLimitationFromRateAnnualMaximum
Namespace Prefix: | ed_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public Utilities, Additional Rate Increase (Decrease), Amount + References No definition available. + Details
Name: | ed_PublicUtilitiesAdditionalRateIncreaseDecreaseAmount
Namespace Prefix: | ed_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Public Utilities, Energy and Efficiency Savings Program, Recovery Costs + References No definition available. + Details
Name: | ed_PublicUtilitiesEnergyandEfficiencySavingsProgramRecoveryCosts
Namespace Prefix: | ed_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Public Utilities, Notification Threshold for Debt Capital Structure, Percentage + References No definition available. + Details
Name: | ed_PublicUtilitiesNotificationThresholdforDebtCapitalStructurePercentage
Namespace Prefix: | ed_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public Utilities, Notification Threshold for Non-Utility Investments, Percentage + References No definition available. + Details
Name: | ed_PublicUtilitiesNotificationThresholdforNonUtilityInvestmentsPercentage
Namespace Prefix: | ed_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Public Utilities, Property, Plant And Equipment, Base Rate, Amount Of Cost Recovery + References No definition available. + Details
Name: | ed_PublicUtilitiesPropertyPlantAndEquipmentBaseRateAmountOfCostRecovery
Namespace Prefix: | ed_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Public Utilities, Requested Return on Equity, Common Equity Ratio, Percentage + References No definition available. + Details
Name: | ed_PublicUtilitiesRequestedReturnOnEquityCommonEquityRatioPercentage
Namespace Prefix: | ed_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public Utilities, Return on Equity, Percentage + References No definition available. + Details
Name: | ed_PublicUtilitiesReturnonEquityPercentage
Namespace Prefix: | ed_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Regulatory Matters Average Base Rate + References No definition available. + Details
Name: | ed_RegulatoryMattersAverageBaseRate
Namespace Prefix: | ed_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Revenue Requirement Earnings Percentage + References No definition available. + Details
Name: | ed_RevenueRequirementEarningsPercentage
Namespace Prefix: | ed_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Revenue Sharing Threshold Limit + References No definition available. + Details
Name: | ed_RevenueSharingThresholdLimit
Namespace Prefix: | ed_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Tax Cuts And Jobs Act Of 2017, Change In Tax Rate, Regulatory Liabilities, Income Tax Benefit + References No definition available. + Details
Name: | ed_TaxCutsAndJobsActOf2017ChangeInTaxRateRegulatoryLiabilitiesIncomeTaxBenefit
Namespace Prefix: | ed_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Tax Cuts And Jobs Act Of 2017, Change In Tax Rate, Regulatory Liabilities, Income Tax Benefit, Amortization Period + References No definition available. + Details
Name: | ed_TaxCutsAndJobsActOf2017ChangeInTaxRateRegulatoryLiabilitiesIncomeTaxBenefitAmortizationPeriod
Namespace Prefix: | ed_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tax Cuts And Jobs Act Of 2017, Income Tax Credit + References No definition available. + Details
Name: | ed_TaxCutsAndJobsActOf2017IncomeTaxCredit
Namespace Prefix: | ed_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Weighted Average Cost Of Capital + References No definition available. + Details
Name: | ed_WeightedAverageCostOfCapital
Namespace Prefix: | ed_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130532-203044 + Details
Name: | us-gaap_ContractWithCustomerLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of deferred tax liability attributable to taxable temporary differences from regulatory assets and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32632-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32621-109319 + Details
Name: | us-gaap_DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebtPercentageBearingVariableInterestRate
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of public utility's approved return on equity. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesApprovedReturnOnEquityPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesGeneralDisclosuresLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of public utility's requested rate increase (decrease) with regulatory agency. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage of public utility's requested return on equity. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesRequestedReturnOnEquityPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition A segregation of retained earnings which is unavailable for dividend distribution. Includes also retained earnings appropriated for loss contingencies. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=65888546&loc=d3e21346-112643 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=65888546&loc=d3e21332-112643 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(23)(a)(4)(i)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-03(30)(a)(3)(ii)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_RetainedEarningsAppropriated
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(iv)) -URI http://asc.fasb.org/extlink&oid=124359900&loc=SL124442552-122756 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(iv)) -URI http://asc.fasb.org/extlink&oid=124359900&loc=SL124442526-122756 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(iii)(A)) -URI http://asc.fasb.org/extlink&oid=124359900&loc=SL124442552-122756 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9031-108599 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(i)) -URI http://asc.fasb.org/extlink&oid=124359900&loc=SL124442526-122756 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(i)) -URI http://asc.fasb.org/extlink&oid=124359900&loc=SL124442552-122756 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8906-108599 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(5)) -URI http://asc.fasb.org/extlink&oid=124359900&loc=SL124442552-122756 Reference 15: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9038-108599 Reference 16: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(iii)(A)) -URI http://asc.fasb.org/extlink&oid=124359900&loc=SL124442526-122756 Reference 17: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(5)) -URI http://asc.fasb.org/extlink&oid=124359900&loc=SL124442526-122756 Reference 18: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9054-108599 Reference 19: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(ii)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 20: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-05(b)(2)) -URI http://asc.fasb.org/extlink&oid=120399901&loc=d3e537907-122884 Reference 21: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1B -Subparagraph (SX 210.13-02(a)(4)(iii)(B)) -URI http://asc.fasb.org/extlink&oid=124359900&loc=SL124442552-122756 Reference 22: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section S99 -Paragraph 1A -Subparagraph (SX 210.13-01(a)(4)(ii)) -URI http://asc.fasb.org/extlink&oid=124359900&loc=SL124442526-122756 Reference 23: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
Name: | us-gaap_Revenues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of operating expense for depreciation and amortization of regulated operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(b)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
Name: | us-gaap_UtilitiesOperatingExpenseDepreciationAndAmortization
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=ed_ConsolidatedEdisonCompanyofNewYorkInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilityAxis=us-gaap_GasTransmissionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=ed_LeaksAndServiceTerminationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermContractForPurchaseOfElectricPowerAxis=ed_RatePlanforYear1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=ed_GasExcludingAMIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=us-gaap_AdvancedMeteringInfrastructureCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermContractForPurchaseOfElectricPowerAxis=ed_RatePlanforYear2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermContractForPurchaseOfElectricPowerAxis=ed_RatePlanforYear3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilityAxis=us-gaap_ElectricTransmissionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAgencyAxis=ed_NewYorkStatePublicServiceCommissionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ed_PeriodAxis=ed_AnnuallyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ed_PeriodAxis=ed_OverTenYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ed_PeriodAxis=ed_OverTwoYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryLiabilityAxis=ed_ProtectedPortionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryLiabilityAxis=ed_UnprotectedPortionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ed_PeriodAxis=ed_OverFiveYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |