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Regulatory Matters - Summary of Utilities Rate Plans (CECONY-Gas) (Details) - USD ($) | 1 Months Ended | 12 Months Ended | 36 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2022 | Dec. 31, 2019
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Revenues |  | $ 12,574,000,000 | $ 12,337,000,000 | $ 12,033,000,000 |  |
Deferred revenues |  | 17,000,000 | 20,000,000 | 87,000,000 |  | $ 17,000,000
CECONY |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Revenues |  | 10,821,000,000 | 10,680,000,000 | 10,468,000,000 |  |
CECONY | Gas |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Percentage of revenue reserve |  |  |  |  |  | 15.00%
Other earnings incentives |  | 7,000,000 | 6,000,000 | 7,000,000 |  |
Deferred revenues |  | 10,000,000 | 12,000,000 | 3,000,000 |  | $ 10,000,000
Negative revenue adjustments |  | 10,000,000 | 4,000,000 | 5,000,000 |  |
Cost reconciliation, deferred net regulatory liabilities |  | 18,000,000 | 44,000,000 | 2,000,000 |  | 18,000,000
Deferred regulatory asset (liability) |  | $ (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 |  |
Common equity ratio (percent) |  |  |  |  |  | 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 |  |  |  | $ 65,000,000
CECONY | Gas | Gas Leak Backlog, Leak Prone Pipe and Service Terminations |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Revenues |  | $ 9,000,000 | $ 0 |  |  |
CECONY | Gas | Scenario, Forecast |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Percentage of revenue reserve |  |  |  |  | 15.00% |
Earnings sharing (percent) |  |  |  |  | 9.30% |
Common equity ratio (percent) |  |  |  |  | 48.00% |
Income tax benefit to be credited to customers resulting from TCJA |  |  |  |  | $ 63,000,000 |
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)
Amortization to income of net regulatory (assets) and liabilities |  |  |  |  |  | 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 (percent) |  | 4.93% |  |  |  | 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 |
Amortization to income of net regulatory (assets) and liabilities |  |  |  |  | 39,000,000 |
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% |
Cost of long-term debt (percent) |  |  |  |  | 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
Amortization to income of net regulatory (assets) and liabilities |  |  |  |  |  | 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 (percent) |  | 4.88% |  |  |  | 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 |
Amortization to income of net regulatory (assets) and liabilities |  |  |  |  | 37,000,000 |
Potential incentives if performance targets are met |  |  |  |  | 22,000,000 |
Potential penalties (annually) |  |  |  |  | 88,000,000 |
Average rate base |  |  |  |  | 7,911,000,000 |
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
Amortization to income of net regulatory (assets) and liabilities |  |  |  |  |  | 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 (percent) |  | 4.74% |  |  |  | 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 |
Amortization to income of net regulatory (assets) and liabilities |  |  |  |  | 36,000,000 |
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 |
NYSPSC | 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 |
NYSPSC | 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 |
NYSPSC | 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 |
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 |
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 |
Unprotected Portion | CECONY | Gas | Scenario, Forecast |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA |  |  |  |  | $ 107,000,000 |
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 |

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