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Regulatory Matters - Summary of Utilities Rate Plans (CECONY-Steam) (Details) - CECONY - Steam | 12 Months Ended | 36 Months Ended | 108 Months Ended
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Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Oct. 31, 2026 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2022 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory liabilities, amortization period |  |  |  |  |  |  |  | 3 years |  |  |  | 3 years |
Amortizations to income of net regulatory (assets) and liabilities |  |  |  |  |  |  |  |  |  |  |  | $ 37,000,000 |
Negative revenue adjustments |  |  |  |  |  |  |  |  |  |  |  |  | $ 0
Cost reconciliation, deferred net regulatory liabilities | $ 18,000,000 |  |  | $ 8,000,000 |  | $ 14,000,000 | $ 8,000,000 |  | $ 42,000,000 |  |  |  |
Cost reconciliation, deferred net regulatory assets | 11,000,000 | $ 32,000,000 | $ 35,000,000 |  | $ 1,000,000 |  |  | $ 17,000,000 |  |  |  | $ 17,000,000 | $ 32,000,000
Deferred regulatory asset (liability) | 0 |  | (1,000,000) | (2,000,000) |  |  |  |  |  |  |  |  |
Increase (decrease) in regulatory liabilities | 100,000 |  | 0 | $ 0 | 0 | 0 | 0 | 0 | 0 | $ 100,000 |  |  |
Authorized return on common equity (percent) |  |  |  |  |  |  |  |  |  |  |  | 9.30% |
Earnings sharing, positive adjustment |  |  |  |  |  | 2,300,000 | 1,100,000 | 4,000,000 |  |  |  |  |
Earnings sharing, threshold limit | $ 0 | 0 | $ 0 |  | $ 5,000,000 | $ 16,500,000 | $ 8,500,000 | 7,800,000 | $ 11,500,000 | $ 0 |  |  |
Earnings sharing (percent) |  |  |  |  | 9.90% |  |  |  |  |  |  |  |
Earnings sharing, additional adjustment |  | $ 200,000 |  |  |  |  |  | 400,000 |  |  |  |  |
Common equity ratio (percent) |  |  |  |  |  |  |  |  |  |  |  | 48.00% |
Revenue from contracts with customer, late payment charges, annual cap, percent (in percent) | 0.005 |  |  |  |  |  |  |  |  |  |  |  |
Difference in property taxes (percent) | 90.00% |  |  |  |  |  |  |  |  |  |  | 90.00% |
Deferral, annual maximum (not more than) (percent) |  |  |  |  |  |  |  |  |  |  |  | 0.10% |
Recovery deferral (percent) | 80.00% |  |  |  |  |  |  |  |  |  |  |  |
Maximum deferral (percent) | 30.00% |  |  |  |  |  |  |  |  |  |  |  |
Other regulatory liabilities |  |  |  |  |  |  |  | $ 8,000,000 |  |  |  | $ 8,000,000 |
Unprotected Portion |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA | $ 24,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Scenario, Forecast | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized return on common equity (percent) |  |  |  |  |  |  |  |  |  |  | 9.25% |  |
Earnings sharing (percent) |  |  |  |  |  |  |  |  |  |  | 9.75% |  |
Common equity ratio (percent) |  |  |  |  |  |  |  |  |  |  | 48.00% |  |
Rate Plan for Year 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  |  |  |  |  |  | (22,400,000) |
Weighted average cost of capital (after-tax) |  |  |  |  |  |  |  |  |  |  |  | $ 1,511,000,000 |
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  |  |  |  |  |  |  | 7.10% |
Actual return on common equity (percent) |  |  |  |  |  |  |  |  |  |  |  | 9.82% |
Cost of long-term debt rate |  |  |  |  |  |  | 5.17% |  |  |  |  |  |
Requested rate increase (decrease), amount | 77,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Late payment charges and fees | $ 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Deferral, annual maximum (not more than) (percent) | 0.10% |  |  |  |  |  |  |  |  |  |  |  |
Rate Plan for Year 1 | Protected Portion |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA | $ 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Tax cuts and jobs act of 2017, change in tax rate, regulatory asset, income tax benefit | 11,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Rate Plan for Year 1 | Scenario, Forecast | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  |  |  |  |  | $ 110,000,000 |  |
Amortizations to income of net regulatory (assets) and liabilities |  |  |  |  |  |  |  |  |  |  | 15,000,000 |  |
Potential Penalty Expense |  |  |  |  |  |  |  |  |  |  | 3,700,000 |  |
Net utility plant reconciliations |  |  |  |  |  |  |  |  |  |  | 2,025,000,000 |  |
Weighted average cost of capital (after-tax) |  |  |  |  |  |  |  |  |  |  | $ 1,799,000,000 |  |
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  |  |  |  |  |  | 6.78% |  |
Cost of long-term debt rate |  |  |  |  |  |  |  |  |  |  | 4.51% |  |
Rate Plan for Year 1 | Production |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  |  |  |  |  |  |  | $ 1,752,000,000 |
Rate Plan for Year 1 | Distribution |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  |  |  |  |  |  |  | 6,000,000 |
Rate Plan for Year 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  |  |  |  |  |  | 19,800,000 |
Weighted average cost of capital (after-tax) |  |  |  |  |  |  |  |  |  |  |  | $ 1,547,000,000 |
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  |  |  |  |  |  |  | 7.13% |
Actual return on common equity (percent) |  |  |  |  |  |  |  |  |  |  |  | 10.88% |
Cost of long-term debt rate |  |  |  |  |  |  | 5.23% |  |  |  |  |  |
Requested rate increase (decrease), amount | 77,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Late payment charges and fees | $ 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Deferral, annual maximum (not more than) (percent) | 0.075% |  |  |  |  |  |  |  |  |  |  |  |
Rate Plan for Year 2 | Protected Portion |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Rate Plan for Year 2 | Scenario, Forecast | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  |  |  |  |  | $ 44,000,000 |  |
Amortizations to income of net regulatory (assets) and liabilities |  |  |  |  |  |  |  |  |  |  | 3,000,000 |  |
Potential Penalty Expense |  |  |  |  |  |  |  |  |  |  | 3,800,000 |  |
Net utility plant reconciliations |  |  |  |  |  |  |  |  |  |  | 2,029,000,000 |  |
Weighted average cost of capital (after-tax) |  |  |  |  |  |  |  |  |  |  | $ 1,848,000,000 |  |
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  |  |  |  |  |  | 6.81% |  |
Cost of long-term debt rate |  |  |  |  |  |  |  |  |  |  | 4.58% |  |
Rate Plan for Year 2 | Production |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  |  |  |  |  |  |  | $ 1,732,000,000 |
Rate Plan for Year 2 | Distribution |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  |  |  |  |  |  |  | 11,000,000 |
Rate Plan for Year 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  |  |  |  |  |  | 20,300,000 |
Weighted average cost of capital (after-tax) |  |  |  |  |  |  |  |  |  |  |  | $ 1,604,000,000 |
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  |  |  |  |  |  |  | 7.21% |
Actual return on common equity (percent) |  |  |  |  |  |  |  |  |  |  |  | 10.54% |
Cost of long-term debt rate |  |  |  |  |  |  | 5.39% |  |  |  |  |  |
Requested rate increase (decrease), amount | 77,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Late payment charges and fees | $ 3,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Deferral, annual maximum (not more than) (percent) | 0.05% |  |  |  |  |  |  |  |  |  |  |  |
Rate Plan for Year 3 | Protected Portion |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in regulatory liability resulting from TCJA | $ 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Rate Plan for Year 3 | Scenario, Forecast | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  |  |  |  |  | $ 45,000,000 |  |
Amortizations to income of net regulatory (assets) and liabilities |  |  |  |  |  |  |  |  |  |  | 3,000,000 |  |
Potential Penalty Expense |  |  |  |  |  |  |  |  |  |  | 3,800,000 |  |
Net utility plant reconciliations |  |  |  |  |  |  |  |  |  |  | 2,015,000,000 |  |
Weighted average cost of capital (after-tax) |  |  |  |  |  |  |  |  |  |  | $ 1,882,000,000 |  |
Weighted average cost of capital (after-tax) (percent) |  |  |  |  |  |  |  |  |  |  | 6.83% |  |
Cost of long-term debt rate |  |  |  |  |  |  |  |  |  |  | 4.62% |  |
Rate Plan for Year 3 | Production |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  |  |  |  |  |  |  | $ 1,720,000,000 |
Rate Plan for Year 3 | Distribution |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net utility plant reconciliations |  |  |  |  |  |  |  |  |  |  |  | 25,000,000 |
Rate Plan for Year 3 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Potential Penalty Expense |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |
Rate Plan for Year 4 |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  |  |  |  |  |  | $ 0 |
Actual return on common equity (percent) |  |  |  |  |  |  |  |  |  |  |  | 9.51% |
Rate Plan for Year 5 |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  |  |  |  |  |  | $ 0 |
Actual return on common equity (percent) |  |  |  |  |  |  |  |  |  |  |  | 11.73% |
Rate Plan For Year 6 |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  |  |  |  |  |  | $ 0 |
Actual return on common equity (percent) |  |  |  |  |  |  |  |  |  |  |  | 10.45% |
Rate Plan For Year 7 |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  |  |  |  |  |  | $ 0 |
Actual return on common equity (percent) |  |  |  |  |  |  |  |  |  |  |  | 7.91% |
Rate Plan For Year 8 |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  |  |  |  |  |  | $ 0 |
Actual return on common equity (percent) |  |  |  |  |  |  |  |  |  |  |  | 5.99% |
Rate Plan For Year 9 |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  |  |  |  |  |  | $ 0 |
Actual return on common equity (percent) |  |  |  |  |  |  |  |  |  |  |  | 5.72% |
Rate Plan For Year 10 |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Base rate changes |  |  |  |  |  |  |  |  |  |  |  | $ 0 |
Actual return on common equity (percent) |  |  |  |  |  |  |  |  |  |  |  | (0.10%) |

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- Definition The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition Percentage of public utility's approved return on equity. + References No definition available. + Details
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