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Regulatory Matters - Summary of Utilities Rate Plans (O&R New York-Gas) (Details) - USD ($) | 12 Months Ended | 36 Months Ended
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2024 | Dec. 31, 2021
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Deferred revenues | $ 662,000,000 | $ 599,000,000 |  |  | $ 662,000,000
Earnings above threshold | $ 1,700,000 |  |  |  |
NYSPSC |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Percentage of total consolidated revenues | 15.00% |  |  |  | 15.00%
Percentage of debt to total consolidated debt | 20.00% |  |  |  | 20.00%
Maximum | NYSPSC |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Percentage of total consolidated revenues | 15.00% |  |  |  | 15.00%
O&R | Gas |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Amount of revenues retained | $ 4,000,000 |  |  |  | $ 4,000,000
Share in variances in annual revenue retained (percent) |  |  |  |  | 20.00%
Potential earnings adjustment mechanism incentives |  |  |  |  | $ 300,000
Deferred revenues | 4,000,000 | 500,000 | $ 800,000 |  | 4,000,000
Negative revenue adjustments |  |  | 200,000 |  |
Cost reconciliation, deferred net regulatory liabilities |  |  | 6,000,000 |  |
Cost reconciliation, deferred net regulatory assets | $ 8,000,000 | 1,800,000 |  |  | $ 8,000,000
Earnings sharing (percent) | 9.60% |  |  |  | 9.60%
Common equity ratio, percentage |  |  |  |  | 48.00%
O&R | Gas | Customers |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Share in variances in annual revenue retained (percent) |  |  |  |  | 80.00%
O&R | Gas | Scenario, Forecast |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Earnings sharing (percent) |  |  |  | 9.70% |
Deferrals for property taxes limitation from rates (percent) |  |  |  | 90.00% |
O&R | Gas | Year 1 |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Base rate changes |  |  |  |  | $ (7,500,000)
Amortization to income of net regulatory assets |  |  |  |  | 1,800,000
Potential earnings adjustment mechanism incentives |  |  |  |  | 1,200,000
Net utility plant reconciliations |  |  |  |  | 593,000,000
Average rate base |  |  |  |  | $ 454,000,000
Weighted average cost of capital (after-tax) (percent) |  |  |  |  | 6.97%
Actual return on common equity (percent) |  |  |  |  | 8.90%
Cost of long-term debt (percent) |  |  |  |  | 5.17%
Requested rate increase (decrease), amount |  |  |  |  | $ (5,900,000)
O&R | Gas | Year 1 | AMI |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Net utility plant reconciliations |  |  |  |  | 20,000,000
O&R | Gas | Year 1 | Maximum |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Potential penalties (annually) |  |  |  |  | 5,500,000
O&R | Gas | Year 1 | Scenario, Forecast |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Base rate changes |  |  |  | $ 700,000 |
Amortization to income of net regulatory assets |  |  |  | 800,000 |
Potential earnings adjustment mechanism incentives |  |  |  | 200,000 |
Potential positive rate adjustment for gas safety and performance |  |  |  | 1,200,000 |
Net utility plant reconciliations |  |  |  | 720,000,000 |
Average rate base |  |  |  | $ 566,000,000 |
Weighted average cost of capital (after-tax) (percent) |  |  |  | 6.77% |
Cost of long-term debt (percent) |  |  |  | 4.58% |
Requested rate increase (decrease), amount |  |  |  | $ 4,400,000 |
Deferral, annual maximum (not more than) (percent) |  |  |  | 0.10% |
O&R | Gas | Year 1 | Scenario, Forecast | Maximum |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Potential penalties (annually) |  |  |  | $ 6,300,000 |
O&R | Gas | Year 2 |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Base rate changes |  |  |  |  | 3,600,000
Amortization to income of net regulatory assets |  |  |  |  | 1,800,000
Potential earnings adjustment mechanism incentives |  |  |  |  | 1,300,000
Net utility plant reconciliations |  |  |  |  | 611,000,000
Average rate base |  |  |  |  | $ 476,000,000
Weighted average cost of capital (after-tax) (percent) |  |  |  |  | 6.96%
Actual return on common equity (percent) |  |  |  |  | 9.58%
Cost of long-term debt (percent) |  |  |  |  | 5.14%
Requested rate increase (decrease), amount |  |  |  |  | $ 1,000,000
O&R | Gas | Year 2 | AMI |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Net utility plant reconciliations |  |  |  |  | 24,000,000
O&R | Gas | Year 2 | Maximum |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Potential penalties (annually) |  |  |  |  | 5,700,000
O&R | Gas | Year 2 | Scenario, Forecast |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Base rate changes |  |  |  | 7,400,000 |
Amortization to income of net regulatory assets |  |  |  | 700,000 |
Potential earnings adjustment mechanism incentives |  |  |  | 200,000 |
Potential positive rate adjustment for gas safety and performance |  |  |  | 1,300,000 |
Net utility plant reconciliations |  |  |  | 761,000,000 |
Average rate base |  |  |  | $ 607,000,000 |
Weighted average cost of capital (after-tax) (percent) |  |  |  | 6.73% |
Cost of long-term debt (percent) |  |  |  | 4.51% |
Requested rate increase (decrease), amount |  |  |  | $ 4,400,000 |
Deferral, annual maximum (not more than) (percent) |  |  |  | 0.075% |
O&R | Gas | Year 2 | Scenario, Forecast | Maximum |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Potential penalties (annually) |  |  |  | $ 6,700,000 |
O&R | Gas | Year 3 |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Base rate changes |  |  |  |  | 700,000
Amortization to income of net regulatory assets |  |  |  |  | 1,800,000
Potential earnings adjustment mechanism incentives |  |  |  |  | 1,300,000
Net utility plant reconciliations |  |  |  |  | 632,000,000
Average rate base |  |  |  |  | $ 498,000,000
Weighted average cost of capital (after-tax) (percent) |  |  |  |  | 6.96%
Actual return on common equity (percent) |  |  |  |  | 10.11%
Cost of long-term debt (percent) |  |  |  |  | 5.14%
Requested rate increase (decrease), amount |  |  |  |  | $ 1,000,000
O&R | Gas | Year 3 | AMI |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Net utility plant reconciliations |  |  |  |  | 25,000,000
O&R | Gas | Year 3 | Maximum |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Potential penalties (annually) |  |  |  |  | $ 6,000,000
O&R | Gas | Year 3 | Scenario, Forecast |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Base rate changes |  |  |  | 9,900,000 |
Amortization to income of net regulatory assets |  |  |  | 300,000 |
Potential earnings adjustment mechanism incentives |  |  |  | 400,000 |
Potential positive rate adjustment for gas safety and performance |  |  |  | 1,400,000 |
Net utility plant reconciliations |  |  |  | 803,000,000 |
Average rate base |  |  |  | $ 649,000,000 |
Weighted average cost of capital (after-tax) (percent) |  |  |  | 6.72% |
Cost of long-term debt (percent) |  |  |  | 4.49% |
Requested rate increase (decrease), amount |  |  |  | $ 4,400,000 |
Deferral, annual maximum (not more than) (percent) |  |  |  | 0.05% |
O&R | Gas | Year 3 | Scenario, Forecast | Maximum |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Potential penalties (annually) |  |  |  | $ 7,300,000 |
O&R | Electric |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Deferred revenues |  | 6,000,000 | 100,000 |  |
Negative revenue adjustments | $ 0 | 0 | 0 |  |
Earnings sharing (percent) | 9.60% |  |  |  | 9.60%
Common equity ratio, percentage |  |  |  |  | 48.00%
Deferrals for property taxes limitation from rates (percent) |  |  |  |  | 90.00%
O&R | Electric | Scenario, Forecast |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Earnings sharing (percent) |  |  |  | 9.70% |
O&R | Electric | 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
Average rate base |  |  |  |  | $ 878,000,000
Weighted average cost of capital (after-tax) (percent) |  |  |  |  | 6.97%
Actual return on common equity (percent) |  |  |  |  | 9.60%
Cost of long-term debt (percent) |  |  |  |  | 5.17%
Requested rate increase (decrease), amount |  |  |  |  | $ 8,600,000
Deferral, annual maximum (not more than) (percent) |  |  |  |  | 10.00%
O&R | Electric | Year 1 | AMI |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Net utility plant reconciliations |  |  |  |  | $ 48,000,000
O&R | Electric | Year 1 | Maximum |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Potential penalties (annually) |  |  |  |  | 4,400,000
O&R | Electric | Year 1 | Scenario, Forecast |  |  |  |  |
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 |
Net utility plant reconciliations |  |  |  | 1,175,000,000 |
Average rate base |  |  |  | $ 1,021,000,000 |
Weighted average cost of capital (after-tax) (percent) |  |  |  | 6.77% |
Cost of long-term debt (percent) |  |  |  | 4.58% |
Requested rate increase (decrease), amount |  |  |  | $ 11,700,000 |
O&R | Electric | Year 1 | Scenario, Forecast | Maximum |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Potential penalties (annually) |  |  |  | 4,300,000 |
O&R | Electric | 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
Average rate base |  |  |  |  | $ 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) |  |  |  |  | 7.50%
O&R | Electric | Year 2 | AMI |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Net utility plant reconciliations |  |  |  |  | $ 58,000,000
O&R | Electric | Year 2 | Maximum |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Potential penalties (annually) |  |  |  |  | 4,400,000
O&R | Electric | Year 2 | Scenario, Forecast |  |  |  |  |
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 |
Net utility plant reconciliations |  |  |  | 1,198,000,000 |
Average rate base |  |  |  | $ 1,044,000,000 |
Weighted average cost of capital (after-tax) (percent) |  |  |  | 6.73% |
Cost of long-term debt (percent) |  |  |  | 4.51% |
Requested rate increase (decrease), amount |  |  |  | $ 11,700,000 |
O&R | Electric | Year 2 | Scenario, Forecast | Maximum |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Potential penalties (annually) |  |  |  | 4,400,000 |
O&R | Electric | 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
Average rate base |  |  |  |  | $ 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) |  |  |  |  | 5.00%
O&R | Electric | Year 3 | AMI |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Net utility plant reconciliations |  |  |  |  | $ 61,000,000
O&R | Electric | Year 3 | Maximum |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Potential penalties (annually) |  |  |  |  | $ 4,500,000
O&R | Electric | Year 3 | Scenario, Forecast |  |  |  |  |
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 |  |  |  | 4,000,000.0 |
Net utility plant reconciliations |  |  |  | 1,304,000,000 |
Average rate base |  |  |  | $ 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 | Year 3 | Scenario, Forecast | Maximum |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Potential penalties (annually) |  |  |  | $ 5,100,000 |
Energy Efficiency | O&R | Gas |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Actual earnings adjustment mechanism incentives | $ 500,000 |  |  |  |
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 | Gas |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Actual earnings adjustment mechanism incentives | 200,000 | 300,000 | 700,000 |  |
Incentives reversed | 300,000 |  |  |  |
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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