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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2021 | Oct. 31, 2018
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Deferred revenues | $ 599,000,000 | $ 514,000,000 |  |  |  |  |
Deferred revenues | $ 17,000,000 | 20,000,000 | $ 87,000,000 |  |  |  |
NYSPSC |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Percentage of total consolidated revenues | 15.00% |  |  |  |  |  |
Percentage of debt to total consolidated debt | 20.00% |  |  |  |  |  |
Maximum | NYSPSC |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Percentage of total consolidated revenues | 15.00% |  |  |  |  |  |
O&R | Gas |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Deferred revenues |  |  |  |  | $ 800,000 |  |
Deferred revenues |  | 6,300,000 | 1,700,000 | $ 6,200,000 |  |  |
Negative revenue adjustments | $ 200,000 | 100,000 | 0 | 0 | 0 |  |
Cost reconciliation, deferred net regulatory liabilities |  | 7,400,000 | 3,500,000 |  | 4,500,000 |  |
Cost reconciliation, deferred net regulatory assets |  |  |  | 6,600,000 |  |  |
Deferred regulatory asset (liability) |  | $ (400,000) |  |  | $ 0 |  |
Authorized return on common equity (percent) |  |  |  |  |  |  | 9.00%
Earnings sharing (percent) |  |  |  |  |  |  | 9.60%
Earnings sharing, threshold limit |  |  | $ 200,000 | $ 4,000,000 |  |  |
Common equity ratio (percent) |  |  |  |  |  |  | 48.00%
O&R | Gas | Property Tax and Interest Rate Reconciliations |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Regulatory assets not recoverable |  |  |  |  |  |  | $ 14,000,000
O&R | Gas | Scenario, Forecast |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Amount of revenues retained |  |  |  |  |  | $ 4,000,000 |
Share in variances in annual revenue retained (percent) |  |  |  |  |  | 20.00% |
Potential earnings adjustment mechanism incentives |  |  |  |  |  | $ 300,000 |
Authorized return on common equity (percent) |  |  |  |  |  | 9.00% |
Earnings sharing (percent) |  |  |  |  |  | 9.60% |
Common equity ratio (percent) |  |  |  |  |  | 48.00% |
O&R | Gas | Scenario, Forecast | Customers |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Share in variances in annual revenue retained (percent) |  |  |  |  |  | 80.00% |
O&R | Gas | Year 1 |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  | 16,400,000
Amortization to income of net regulatory assets |  |  |  |  |  |  | 1,700,000
Net utility plant reconciliations |  |  |  |  |  |  | 492,000,000
Average rate base |  |  |  |  |  |  | $ 366,000,000
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  |  | 7.10%
Actual return on common equity (percent) |  |  |  |  |  |  | 11.20%
Cost of long-term debt (percent) |  |  |  |  |  |  | 5.42%
Rate exclusion amount with balance below regulatory threshold |  |  |  |  |  |  | $ 500,000
O&R | Gas | Year 1 | Maximum |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Potential penalties (annually) |  |  |  |  |  |  | 3,700,000
O&R | Gas | Year 1 | Scenario, Forecast |  |  |  |  |  |  |
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% |
Cost of long-term debt (percent) |  |  |  |  |  | 5.17% |
Requested rate increase (decrease), amount |  |  |  |  |  | $ (5,900,000) |
O&R | Gas | Year 1 | Scenario, Forecast | AMI |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  | 20,000,000 |
O&R | Gas | Year 1 | Scenario, Forecast | Maximum |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Potential penalties (annually) |  |  |  |  |  | 5,500,000 |
O&R | Gas | Year 2 |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  | 16,400,000
Amortization to income of net regulatory assets |  |  |  |  |  |  | 2,100,000
Net utility plant reconciliations |  |  |  |  |  |  | 518,000,000
Average rate base |  |  |  |  |  |  | $ 391,000,000
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  |  | 7.06%
Actual return on common equity (percent) |  |  |  |  |  |  | 9.70%
Cost of long-term debt (percent) |  |  |  |  |  |  | 5.35%
Rate exclusion amount with balance below regulatory threshold |  |  |  |  |  |  | $ 4,200,000
O&R | Gas | Year 2 | Maximum |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Potential penalties (annually) |  |  |  |  |  |  | 4,700,000
O&R | Gas | Year 2 | Scenario, Forecast |  |  |  |  |  |  |
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% |
Cost of long-term debt (percent) |  |  |  |  |  | 5.14% |
Requested rate increase (decrease), amount |  |  |  |  |  | $ 1,000,000.0 |
O&R | Gas | Year 2 | Scenario, Forecast | AMI |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  | 24,000,000 |
O&R | Gas | Year 2 | Scenario, Forecast | Maximum |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Potential penalties (annually) |  |  |  |  |  | 5,700,000 |
O&R | Gas | Year 3 |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  | 5,800,000
Base rate change through surcharge |  |  |  |  |  |  | 10,600,000
Amortization to income of net regulatory assets |  |  |  |  |  |  | 2,500,000
Net utility plant reconciliations |  |  |  |  |  |  | 546,000,000
Average rate base |  |  |  |  |  |  | $ 417,000,000
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  |  | 7.06%
Actual return on common equity (percent) |  |  |  |  |  |  | 8.00%
Cost of long-term debt (percent) |  |  |  |  |  |  | 5.35%
Rate exclusion amount with balance below regulatory threshold |  |  |  |  |  |  | $ 7,200,000
O&R | Gas | Year 3 | Maximum |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Potential penalties (annually) |  |  |  |  |  |  | $ 4,900,000
O&R | Gas | Year 3 | Scenario, Forecast |  |  |  |  |  |  |
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% |
Cost of long-term debt (percent) |  |  |  |  |  | 5.14% |
Requested rate increase (decrease), amount |  |  |  |  |  | $ 1,000,000.0 |
O&R | Gas | Year 3 | Scenario, Forecast | AMI |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  | 25,000,000 |
O&R | Gas | Year 3 | Scenario, Forecast | Maximum |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Potential penalties (annually) |  |  |  |  |  | $ 6,000,000 |
Energy Efficiency | O&R | Gas |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Actual earnings adjustment mechanism incentives | 300,000 |  |  |  |  |  |
Service Termination | O&R | Gas |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Actual earnings adjustment mechanism incentives | $ 700,000 |  |  |  |  |  |

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