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Regulatory Matters - Summary of Utilities Rate Plans (CECONY-Electric) (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] |  |  |  |  |  |  |
Deferred regulatory liabilities |  | $ 0 | $ 3,000,000 | $ 7,000,000 | $ 41,000,000 |  | $ 3,000,000
TOTAL OPERATING REVENUES |  | 14,663,000,000 | 15,670,000,000 | 13,676,000,000 |  |  |
CECONY |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
TOTAL OPERATING REVENUES |  | 13,476,000,000 | 13,268,000,000 | 11,716,000,000 |  |  |
CECONY | Electric |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Retention of annual transmission congestion revenues |  |  |  |  |  |  | 75,000,000
Actual earnings adjustment mechanism incentives |  | 34,400,000 | 33,000,000 | 64,000,000 | 34,000,000 |  |
Deferred regulatory liabilities |  | 162,000,000 | 90,000,000 | 226,000,000 | 242,000,000 |  | 90,000,000
Negative revenue adjustments |  | 0 | 3,000,000 | 0 | 5,000,000 |  |
Cost reconciliation, deferred net regulatory liabilities |  | 140,000,000 | 138,000,000 | 191,000,000 | 288,000,000 |  | 138,000,000
Deferred regulatory asset (liability) |  | $ 1,200,000 | 1,800,000 | 3,200,000 | 4,100,000 |  | $ 1,800,000
Authorized return on common equity (percent) |  |  |  |  |  |  | 8.80%
Earnings sharing (percent) |  | 9.30% |  |  |  |  |
Earnings sharing, threshold limit |  | $ 0 | 0 | 0 | $ 0 |  |
Earnings sharing, positive adjustment |  |  |  | 4,300,000 |  |  |
Common equity ratio (percent) |  |  |  |  |  |  | 48.00%
Recovery or refund of energy costs, deferral period |  |  |  |  |  |  | 10 years
Deferrals for property taxes limitation from rates (percent) |  |  |  |  |  |  | 90.00%
Recovery deferral (percent) |  | 80.00% |  |  |  |  |
Maximum deferral (percent) |  | 15.00% |  |  |  |  |
CECONY | Electric | Gas Leak Backlog, Leak Prone Pipe and Service Terminations |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
TOTAL OPERATING REVENUES |  |  | 4,000,000 |  |  |  |
CECONY | Electric | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Retention of annual transmission congestion revenues |  |  |  |  |  | $ 75,000,000 |
Authorized return on common equity (percent) |  |  |  |  |  | 925.00% |
Earnings sharing (percent) |  |  |  |  |  | 9.75% |
Common equity ratio (percent) |  |  |  |  |  | 48.00% |
CECONY | Electric | NYSPSC |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Actual return on common equity (percent) |  |  |  |  | 8.81% |  |
Amount of cost recovery | $ 43,000,000 |  |  | $ 62,000,000 |  |  |
CECONY | Electric | Rate Plan for Year 1 |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Base rate changes |  |  | 113,000,000 |  |  |  | $ 113,000,000
Amortizations to income of net regulatory (assets) and liabilities |  |  |  |  |  |  | 267,000,000
Potential earnings adjustment mechanism incentives |  |  |  |  |  |  | 69,000,000
Potential penalties (annually) |  |  |  |  |  |  | 450,000,000
Weighted average cost of capital (after-tax) |  |  |  |  |  |  | $ 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% |  |  |  |  |
Recovery of energy efficiency and savings program costs |  |  |  |  |  |  | $ 206,000,000
Deferral, annual maximum (not more than) (percent) |  |  |  |  |  |  | 0.10%
CECONY | Electric | Rate Plan for Year 1 | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  | $ 442,000,000 |
Amortizations to income of net regulatory (assets) and liabilities |  |  |  |  |  | 104,000,000 |
Potential earnings adjustment mechanism incentives |  |  |  |  |  | 70,000,000 |
Potential penalties (annually) |  |  |  |  |  | 516,000,000 |
Weighted average cost of capital (after-tax) |  |  |  |  |  | $ 26,095,000,000 |
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  | 6.75% |
Actual return on common equity (percent) |  |  |  |  |  | 9.46% |
Cost of long-term debt rate |  |  |  |  |  | 4.46% |
Deferral, annual maximum (not more than) (percent) |  |  |  |  |  | 0.10% |
CECONY | Electric | Rate Plan for Year 1 | Electric average excluding AMI |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  |  | $ 24,491,000,000
CECONY | Electric | Rate Plan for Year 1 | Electric average excluding AMI | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  | $ 27,847,000,000 |
CECONY | Electric | Rate Plan for Year 1 | Advanced metering infrastructure (AMI) |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  |  | 572,000,000
CECONY | Electric | Rate Plan for Year 1 | Advanced metering infrastructure (AMI) | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  | 744,000,000 |
CECONY | Electric | Rate Plan for Year 1 | Customer Service Systems (CSS) | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  | 11,000,000 |
CECONY | Electric | Rate Plan for Year 2 |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Base rate changes |  |  | 370,000,000 |  |  |  | 370,000,000
Amortizations to income of net regulatory (assets) and liabilities |  |  |  |  |  |  | 269,000,000
Potential earnings adjustment mechanism incentives |  |  |  |  |  |  | 74,000,000
Potential penalties (annually) |  |  |  |  |  |  | 461,000,000
Weighted average cost of capital (after-tax) |  |  |  |  |  |  | $ 22,783,000,000
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  |  | 6.61%
Actual return on common equity (percent) |  |  |  |  |  |  | 8.03%
Cost of long-term debt rate |  | 4.63% |  |  |  |  |
Recovery of energy efficiency and savings program costs |  |  |  |  |  |  | $ 245,000,000
Deferral, annual maximum (not more than) (percent) |  |  |  |  |  |  | 0.075%
CECONY | Electric | Rate Plan for Year 2 | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  | 518,000,000 |
Amortizations to income of net regulatory (assets) and liabilities |  |  |  |  |  | 49,000,000 |
Potential earnings adjustment mechanism incentives |  |  |  |  |  | 75,000,000 |
Potential penalties (annually) |  |  |  |  |  | 557,000,000 |
Weighted average cost of capital (after-tax) |  |  |  |  |  | $ 27,925,000,000 |
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  | 6.79% |
Cost of long-term debt rate |  |  |  |  |  | 4.54% |
Deferral, annual maximum (not more than) (percent) |  |  |  |  |  | 0.05% |
CECONY | Electric | Rate Plan for Year 2 | Electric average excluding AMI |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  |  | $ 25,092,000,000
CECONY | Electric | Rate Plan for Year 2 | Electric average excluding AMI | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  | $ 29,884,000,000 |
CECONY | Electric | Rate Plan for Year 2 | Advanced metering infrastructure (AMI) |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  |  | 740,000,000
CECONY | Electric | Rate Plan for Year 3 |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Base rate changes |  |  | $ 326,000,000 |  |  |  | 326,000,000
Amortizations to income of net regulatory (assets) and liabilities |  |  |  |  |  |  | 272,000,000
Potential earnings adjustment mechanism incentives |  |  |  |  |  |  | 79,000,000
Potential penalties (annually) |  |  |  |  |  |  | 476,000,000
Weighted average cost of capital (after-tax) |  |  |  |  |  |  | $ 23,926,000,000
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  |  | 6.61%
Actual return on common equity (percent) |  |  |  |  |  |  | 8.41%
Cost of long-term debt rate |  | 4.63% |  |  |  |  |
Recovery of energy efficiency and savings program costs |  |  |  |  |  |  | $ 251,000,000
Deferral, annual maximum (not more than) (percent) |  |  |  |  |  |  | 0.05%
CECONY | Electric | Rate Plan for Year 3 | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  | 382,000,000 |
Amortizations to income of net regulatory (assets) and liabilities |  |  |  |  |  | (205,000,000) |
Potential earnings adjustment mechanism incentives |  |  |  |  |  | 79,000,000 |
Potential penalties (annually) |  |  |  |  |  | 597,000,000 |
Weighted average cost of capital (after-tax) |  |  |  |  |  | $ 29,362,000,000 |
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  | 6.85% |
Cost of long-term debt rate |  |  |  |  |  | 4.64% |
Deferral, annual maximum (not more than) (percent) |  |  |  |  |  | 0.05% |
CECONY | Electric | Rate Plan for Year 3 | Electric average excluding AMI |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  |  | $ 25,708,000,000
CECONY | Electric | Rate Plan for Year 3 | Electric average excluding AMI | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  | $ 31,026,000,000 |
CECONY | Electric | Rate Plan for Year 3 | Advanced metering infrastructure (AMI) |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  |  | 806,000,000
Annually | CECONY | Electric |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Income tax benefit to be credited to customers resulting from TCJA |  |  |  |  |  |  | 126,000,000
Annually | CECONY | Electric | Deferred Project Costs |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Amortizations to income of net regulatory (assets) and liabilities |  |  |  |  |  |  | 48,000,000
Annually | CECONY | Electric | Deferred Project Costs | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Amortizations to income of net regulatory (assets) and liabilities |  |  |  |  |  | 31,000,000 |
Annually | CECONY | Electric | Rate Plan for Year 1 | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Income tax benefit to be credited to customers resulting from TCJA |  |  |  |  |  | 128,000,000 |
Annually | CECONY | Electric | Rate Plan for Year 2 | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Income tax benefit to be credited to customers resulting from TCJA |  |  |  |  |  | 128,000,000 |
Over Five Years | CECONY | Electric | Deferred Project Costs |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Amortizations to income of net regulatory (assets) and liabilities |  |  |  |  |  |  | 238,000,000
Over Three Years | CECONY | Electric |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Income tax benefit to be credited to customers resulting from TCJA |  |  |  |  |  |  | 377,000,000
Over Three Years | CECONY | Electric | Deferred Project Costs | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Amortizations to income of net regulatory (assets) and liabilities |  |  |  |  |  | 93,000,000 |
Over Two Years | CECONY | Electric | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Income tax benefit to be credited to customers resulting from TCJA |  |  |  |  |  | 256,000,000 |
Over Seven To Fifteen Years | CECONY | Electric | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Shortfall in revenue |  |  |  |  |  | 216,000,000 |
Over Seven To Fifteen Years | CECONY | Electric | Rate Plan for Year 1 | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  | 457,000,000 |
Amount of cost recovery |  |  |  |  |  | 244,000,000 |
Over Seven To Fifteen Years | CECONY | Electric | Rate Plan for Year 2 | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  | 457,000,000 |
Amount of cost recovery |  |  |  |  |  | 237,000,000 |
Over Seven To Fifteen Years | CECONY | Electric | Rate Plan for Year 3 | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  | 457,000,000 |
Amount of cost recovery |  |  |  |  |  | 281,000,000 |
Protected Portion | CECONY | Electric |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  | 1,663,000,000
Protected Portion | CECONY | Electric | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  | 1,512,000,000 |
Protected Portion | CECONY | Electric | Rate Plan for Year 1 |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  | 49,000,000
Protected Portion | CECONY | Electric | Rate Plan for Year 1 | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  | 34,000,000 |
Protected Portion | CECONY | Electric | Rate Plan for Year 2 |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  | 50,000,000
Protected Portion | CECONY | Electric | Rate Plan for Year 2 | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  | 63,000,000 |
Protected Portion | CECONY | Electric | Rate Plan for Year 3 |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  | 53,000,000
Protected Portion | CECONY | Electric | Rate Plan for Year 3 | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  | 34,000,000 |
Unprotected Portion | CECONY | Electric |  |  |  |  |  |  |
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 | Electric |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  |  | $ 157,000,000
Unprotected Portion | Annually | CECONY | Electric | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  | 153,000,000 |
Unprotected Portion | Over Two Years | CECONY | Electric | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  |  | $ 306,000,000 |

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