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Regulatory Matters - Summary of Utilities Rate Plans (O&R New York-Electric) (Details) - USD ($) | 1 Months Ended | 12 Months Ended | 36 Months Ended
--- | --- | --- | ---
Jan. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2024 | Dec. 31, 2021
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Deferred regulatory assets |  | $ 722,000,000 | $ 702,000,000 |  |  |  |  |
Deferred regulatory liabilities |  | 0 | 3,000,000 | $ 7,000,000 | $ 41,000,000 |  |  | $ 7,000,000
O&R | Electric |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Deferred regulatory assets |  |  |  |  | 6,000,000 | $ 100,000 |  |
Deferred regulatory liabilities |  | 3,400,000 | 6,900,000 | 10,000,000 |  |  |  | 10,000,000
Negative revenue adjustments |  |  |  | 0 | 0 | 0 |  |
Deferral of net increase (decrease) to regulatory assets |  | 15,400,000 | 9,400,000 | 24,000,000 | 30,300,000 | 4,300,000 |  |
Deferred regulatory asset (liability) |  | $ 0 | 0 | $ 0 | (400,000) | $ 0 |  | $ 0
Earnings sharing (percent) |  |  |  |  |  | 9.60% |  |
Common equity ratio (percent) |  |  |  |  |  |  |  | 48.00%
Deferrals for property taxes limitation from rates (percent) |  |  |  |  |  |  |  | 90.00%
Recovery of late payment charges, period (in years) |  | 3 years |  |  |  |  |  |
Recovery of late payment charges, amount |  | $ 2,200,000 |  |  |  |  |  |
Recovery of late payment charges, return on equity threshold rate |  | 500.00% |  |  |  |  |  |
O&R | Electric | Subsequent Event |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Authorized return on common equity (percent) | 10.25% |  |  |  |  |  |  |
Common equity ratio (percent) | 50.00% |  |  |  |  |  |  |
Requested rate increase (decrease), amount | $ 18,100,000 |  |  |  |  |  |  |
O&R | Electric | Rate Plan for Year 1 |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  |  | $ 13,400,000
Amortization to income of net regulatory assets |  |  |  |  |  |  |  | 1,500,000
Potential earnings adjustment mechanism incentives |  |  |  |  |  |  |  | 3,600,000
Potential incentive if target is met, related to service terminations |  |  |  |  |  |  |  | 500,000
Weighted average cost of capital (after-tax) |  |  |  |  |  |  |  | $ 878,000,000
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  |  |  | 6.97%
Authorized return on common equity (percent) |  |  |  |  |  |  |  | 9.00%
Actual return on common equity (percent) |  |  |  |  |  |  |  | 9.60%
Cost of long-term debt (percent) |  |  |  |  |  |  |  | 5.17%
Requested rate increase (decrease), amount |  |  |  |  |  |  |  | $ 8,600,000
Regulatory assets, amortization period (in years) |  |  |  | 6 years |  |  |  | 6 years
Deferral, annual maximum (not more than) (percent) |  |  |  |  |  |  |  | 0.10%
O&R | Electric | Rate Plan for Year 1 | Electric average excluding AMI |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Average rate base |  |  |  |  |  |  |  | $ 1,008,000,000
O&R | Electric | Rate Plan for Year 1 | Advanced metering infrastructure (AMI) |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Average rate base |  |  |  |  |  |  |  | 48,000,000
O&R | Electric | Rate Plan for Year 1 | Maximum |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Potential penalties (annually) |  |  |  |  |  |  |  | 4,400,000
O&R | Electric | Rate Plan for Year 2 |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  |  | 8,000,000
Amortization to income of net regulatory assets |  |  |  |  |  |  |  | 1,500,000
Potential earnings adjustment mechanism incentives |  |  |  |  |  |  |  | 4,000,000
Potential incentive if target is met, related to service terminations |  |  |  |  |  |  |  | 500,000
Weighted average cost of capital (after-tax) |  |  |  |  |  |  |  | $ 906,000,000
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  |  |  | 6.96%
Actual return on common equity (percent) |  |  |  |  |  |  |  | 8.76%
Cost of long-term debt (percent) |  |  |  |  |  |  |  | 5.14%
Requested rate increase (decrease), amount |  |  |  |  |  |  |  | $ 12,100,000
Deferral, annual maximum (not more than) (percent) |  |  |  |  |  |  |  | 0.075%
O&R | Electric | Rate Plan for Year 2 | Electric average excluding AMI |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Average rate base |  |  |  |  |  |  |  | $ 1,032,000,000
O&R | Electric | Rate Plan for Year 2 | Advanced metering infrastructure (AMI) |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Average rate base |  |  |  |  |  |  |  | 58,000,000
O&R | Electric | Rate Plan for Year 2 | Maximum |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Potential penalties (annually) |  |  |  |  |  |  |  | 4,400,000
O&R | Electric | Rate Plan for Year 3 |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  |  | 5,800,000
Amortization to income of net regulatory assets |  |  |  |  |  |  |  | 1,500,000
Potential earnings adjustment mechanism incentives |  |  |  |  |  |  |  | 4,200,000
Potential incentive if target is met, related to service terminations |  | $ 1,500,000 | $ 2,700,000 |  |  |  |  | 500,000
Weighted average cost of capital (after-tax) |  |  |  |  |  |  |  | $ 948,000,000
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  |  |  | 6.96%
Actual return on common equity (percent) |  |  |  |  |  |  |  | 9.16%
Cost of long-term debt (percent) |  |  |  |  |  |  |  | 5.14%
Requested rate increase (decrease), amount |  |  |  |  |  |  |  | $ 12,200,000
Deferral, annual maximum (not more than) (percent) |  |  |  |  |  |  |  | 0.05%
O&R | Electric | Rate Plan for Year 3 | Electric average excluding AMI |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Average rate base |  |  |  |  |  |  |  | $ 1,083,000,000
O&R | Electric | Rate Plan for Year 3 | Advanced metering infrastructure (AMI) |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Average rate base |  |  |  |  |  |  |  | 61,000,000
O&R | Electric | Rate Plan for Year 3 | Maximum |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Potential penalties (annually) |  |  |  |  |  |  |  | $ 4,500,000
O&R | Electric | Scenario, Forecast |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Earnings sharing (percent) |  |  |  |  |  |  | 9.70% |
Common equity ratio (percent) |  |  |  |  |  |  | 48.00% |
O&R | Electric | Scenario, Forecast | Rate Plan for Year 1 |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  | $ 4,900,000 |
Amortization to income of net regulatory assets |  |  |  |  |  |  | 11,800,000 |
Potential earnings adjustment mechanism incentives |  |  |  |  |  |  | 3,300,000 |
Weighted average cost of capital (after-tax) |  |  |  |  |  |  | $ 1,021,000,000 |
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  |  | 6.77% |
Authorized return on common equity (percent) |  |  |  |  |  |  | 9.20% |
Actual return on common equity (percent) |  |  |  |  |  |  | 0.0009% |
Cost of long-term debt (percent) |  |  |  |  |  |  | 4.58% |
Requested rate increase (decrease), amount |  |  |  |  |  |  | $ 11,700,000 |
Regulatory assets, amortization period (in years) |  |  |  |  |  |  | 5 years |
O&R | Electric | Scenario, Forecast | Rate Plan for Year 1 | Electric average excluding AMI |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Average rate base |  |  |  |  |  |  | $ 1,175,000,000 |
O&R | Electric | Scenario, Forecast | Rate Plan for Year 1 | Maximum |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Potential penalties (annually) |  |  |  |  |  |  | 4,300,000 |
O&R | Electric | Scenario, Forecast | Rate Plan for Year 2 |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  | 16,200,000 |
Amortization to income of net regulatory assets |  |  |  |  |  |  | 13,500,000 |
Potential earnings adjustment mechanism incentives |  |  |  |  |  |  | 2,300,000 |
Weighted average cost of capital (after-tax) |  |  |  |  |  |  | $ 1,044,000,000 |
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  |  | 6.73% |
Actual return on common equity (percent) |  |  |  |  |  |  | 0.00087% |
Cost of long-term debt (percent) |  |  |  |  |  |  | 4.51% |
Requested rate increase (decrease), amount |  |  |  |  |  |  | $ 11,700,000 |
O&R | Electric | Scenario, Forecast | Rate Plan for Year 2 | Electric average excluding AMI |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Average rate base |  |  |  |  |  |  | 1,198,000,000 |
O&R | Electric | Scenario, Forecast | Rate Plan for Year 2 | Maximum |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Potential penalties (annually) |  |  |  |  |  |  | 4,400,000 |
O&R | Electric | Scenario, Forecast | Rate Plan for Year 3 |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  | 23,100,000 |
Amortization to income of net regulatory assets |  |  |  |  |  |  | 15,200,000 |
Potential earnings adjustment mechanism incentives |  |  |  |  |  |  | 4,000,000 |
Weighted average cost of capital (after-tax) |  |  |  |  |  |  | $ 1,144,000,000 |
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  |  | 6.72% |
Cost of long-term debt (percent) |  |  |  |  |  |  | 4.49% |
Requested rate increase (decrease), amount |  |  |  |  |  |  | $ 11,700,000 |
O&R | Electric | Scenario, Forecast | Rate Plan for Year 3 | Electric average excluding AMI |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Average rate base |  |  |  |  |  |  | 1,304,000,000 |
O&R | Electric | Scenario, Forecast | Rate Plan for Year 3 | Maximum |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Potential penalties (annually) |  |  |  |  |  |  | $ 5,100,000 |
Energy Efficiency | O&R | Electric |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Actual earnings adjustment mechanism incentives |  |  |  | $ 1,800,000 | 1,900,000 | $ 2,600,000 |  |
Service Termination | O&R | Electric |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Actual earnings adjustment mechanism incentives |  |  |  | 0 | $ 500,000 | $ 200,000 |  |
Incentives reversed |  |  |  | $ 500,000 |  |  |  |

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