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Regulatory Matters - Summary of Utilities Rate Plans (CECONY-Steam) (Details)
 12 Months Ended 36 Months Ended 108 Months Ended
Dec. 31, 2028
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Dec. 31, 2027
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Dec. 31, 2026
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Dec. 31, 2024
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Dec. 31, 2023
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Dec. 31, 2022
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Dec. 31, 2021
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Dec. 31, 2020
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Dec. 31, 2019
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Dec. 31, 2018
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Dec. 31, 2017
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Dec. 31, 2016
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Dec. 31, 2015
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Dec. 31, 2014
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Dec. 31, 2027
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Oct. 31, 2026
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Dec. 31, 2025
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Dec. 31, 2024
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Dec. 31, 2022
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Dec. 31, 2021
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Dec. 31, 2016
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Dec. 31, 2022
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CECONY                                            
Public Utilities, General Disclosures [Line Items]                                            
Cost reconciliation, deferred net regulatory liabilities       $ 2,400,000                           $ 2,400,000        
CECONY | Steam                                            
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       7,000,000 $ 18,000,000   $ 8,000,000   $ 14,000,000 $ 8,000,000   $ 42,000,000           7,000,000   $ 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             11,000,000 $ 35,000,000     35,000,000
Deferred regulatory asset (liability)       0     (1,000,000) (2,000,000)                   $ 0   (1,000,000)    
Increase (decrease) in regulatory liabilities       100,000     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                           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%                           80.00%        
Maximum deferral (percent)       30.00%                           30.00%        
Other regulatory liabilities                       $ 8,000,000                 $ 8,000,000  
CECONY | Steam | Unprotected Portion                                            
Public Utilities, General Disclosures [Line Items]                                            
Increase in regulatory liability resulting from TCJA       $ 24,000,000                                    
CECONY | Steam | Scenario, Forecast                                            
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%            
CECONY | Steam | 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%                                    
CECONY | Steam | 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                                    
CECONY | Steam | Rate Plan for Year 1 | Scenario, Forecast                                            
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%            
CECONY | Steam | Rate Plan for Year 1 | Production                                            
Public Utilities, General Disclosures [Line Items]                                            
Net utility plant reconciliations                                         $ 1,752,000,000  
CECONY | Steam | Rate Plan for Year 1 | Distribution                                            
Public Utilities, General Disclosures [Line Items]                                            
Net utility plant reconciliations                                         6,000,000  
CECONY | Steam | 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%                                    
CECONY | Steam | Rate Plan for Year 2 | Protected Portion                                            
Public Utilities, General Disclosures [Line Items]                                            
Increase in regulatory liability resulting from TCJA       $ 5,000,000                                    
CECONY | Steam | Rate Plan for Year 2 | Scenario, Forecast                                            
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%            
CECONY | Steam | Rate Plan for Year 2 | Production                                            
Public Utilities, General Disclosures [Line Items]                                            
Net utility plant reconciliations                                         $ 1,732,000,000  
CECONY | Steam | Rate Plan for Year 2 | Distribution                                            
Public Utilities, General Disclosures [Line Items]                                            
Net utility plant reconciliations                                         11,000,000  
CECONY | Steam | 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%                                    
CECONY | Steam | Rate Plan for Year 3 | Protected Portion                                            
Public Utilities, General Disclosures [Line Items]                                            
Increase in regulatory liability resulting from TCJA       $ 6,000,000                                    
CECONY | Steam | Rate Plan for Year 3 | Scenario, Forecast                                            
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%            
CECONY | Steam | Rate Plan for Year 3 | Production                                            
Public Utilities, General Disclosures [Line Items]                                            
Net utility plant reconciliations                                         $ 1,720,000,000  
CECONY | Steam | Rate Plan for Year 3 | Distribution                                            
Public Utilities, General Disclosures [Line Items]                                            
Net utility plant reconciliations                                         25,000,000  
CECONY | Steam | Rate Plan for Year 3 | Maximum                                            
Public Utilities, General Disclosures [Line Items]                                            
Potential Penalty Expense                                         1,000,000  
CECONY | Steam | Rate Plan for Year 4                                            
Public Utilities, General Disclosures [Line Items]                                            
Base rate changes                                         $ 0  
Actual return on common equity (percent)                                         9.51%  
CECONY | Steam | Rate Plan for Year 5                                            
Public Utilities, General Disclosures [Line Items]                                            
Base rate changes                                         $ 0  
Actual return on common equity (percent)                                         11.73%  
CECONY | Steam | Rate Plan For Year 6                                            
Public Utilities, General Disclosures [Line Items]                                            
Base rate changes                                         $ 0  
Actual return on common equity (percent)                                         10.45%  
CECONY | Steam | Rate Plan For Year 7                                            
Public Utilities, General Disclosures [Line Items]                                            
Base rate changes                                         $ 0  
Actual return on common equity (percent)                                         7.91%  
CECONY | Steam | Rate Plan For Year 8                                            
Public Utilities, General Disclosures [Line Items]                                            
Base rate changes                                         $ 0  
Actual return on common equity (percent)                                         5.99%  
CECONY | Steam | Rate Plan For Year 9                                            
Public Utilities, General Disclosures [Line Items]                                            
Base rate changes                                         $ 0  
Actual return on common equity (percent)                                         5.72%  
CECONY | Steam | Rate Plan For Year 10                                            
Public Utilities, General Disclosures [Line Items]                                            
Base rate changes                                         $ 0  
Actual return on common equity (percent)                                         (0.10%)  
CECONY | Gas                                            
Public Utilities, General Disclosures [Line Items]                                            
Negative revenue adjustments       2,000,000 3,000,000 8,000,000                                
Cost reconciliation, deferred net regulatory liabilities       29,000,000 12,000,000 70,000,000 14,000,000 $ 91,000,000                   $ 29,000,000 70,000,000 14,000,000   70,000,000
Deferred regulatory asset (liability)       (31,500,000) (15,500,000) 10,800,000 $ (26,000,000) $ (24,700,000)                   (31,500,000) $ 10,800,000 (26,000,000)   $ 10,800,000
Authorized return on common equity (percent)                                     8.80%      
Earnings sharing, threshold limit       $ 4,300,000 $ 0 $ 0                                
Earnings sharing (percent)           9.30%                         9.30%     9.30%
CECONY | Gas | Protected Portion                                            
Public Utilities, General Disclosures [Line Items]                                            
Increase in regulatory liability resulting from TCJA                                     $ 725,000,000      
CECONY | Gas | Scenario, Forecast                                            
Public Utilities, General Disclosures [Line Items]                                            
Earnings sharing (percent)                                 9.75%          
Common equity ratio (percent)                                 48.00%          
CECONY | Gas | Scenario, Forecast | Protected Portion                                            
Public Utilities, General Disclosures [Line Items]                                            
Increase in regulatory liability resulting from TCJA                                 $ 679,000,000          
CECONY | Gas | Rate Plan for Year 1                                            
Public Utilities, General Disclosures [Line Items]                                            
Base rate changes                                     84,000,000      
Amortizations to income of net regulatory (assets) and liabilities                                     45,000,000      
Potential Penalty Expense                                     81,000,000      
Weighted average cost of capital (after-tax)                                     $ 7,171,000,000      
Weighted average cost of capital (after-tax) (percent)                                     6.61%      
Actual return on common equity (percent)                                     8.40%      
Cost of long-term debt rate           4.63%                         4.63%     4.63%
Requested rate increase (decrease), amount                                       10,400,000    
CECONY | Gas | Rate Plan for Year 1 | Protected Portion                                            
Public Utilities, General Disclosures [Line Items]                                            
Increase in regulatory liability resulting from TCJA                                     $ 14,000,000      
CECONY | Gas | Rate Plan for Year 1 | Scenario, Forecast                                            
Public Utilities, General Disclosures [Line Items]                                            
Base rate changes                                 217,000,000          
Amortizations to income of net regulatory (assets) and liabilities                                 31,000,000          
Potential Penalty Expense                                 107,000,000          
Weighted average cost of capital (after-tax)                                 $ 9,647,000,000          
Weighted average cost of capital (after-tax) (percent)                                 6.75%          
Authorized return on common equity (percent)                                 9.25%          
Actual return on common equity (percent)                                 9.00%          
Cost of long-term debt rate                                 4.46%          
CECONY | Gas | Rate Plan for Year 1 | Scenario, Forecast | Protected Portion                                            
Public Utilities, General Disclosures [Line Items]                                            
Increase in regulatory liability resulting from TCJA                                 $ 9,000,000          
CECONY | Gas | Rate Plan for Year 2                                            
Public Utilities, General Disclosures [Line Items]                                            
Base rate changes                                     122,000,000      
Amortizations to income of net regulatory (assets) and liabilities                                     43,000,000      
Potential Penalty Expense                                     88,000,000      
Weighted average cost of capital (after-tax)                                     $ 7,911,000,000      
Weighted average cost of capital (after-tax) (percent)                                     6.61%      
Actual return on common equity (percent)                                     8.48%      
Cost of long-term debt rate           4.63%                         4.63%     4.63%
Requested rate increase (decrease), amount                                       10,400,000    
CECONY | Gas | Rate Plan for Year 2 | Protected Portion                                            
Public Utilities, General Disclosures [Line Items]                                            
Increase in regulatory liability resulting from TCJA                                     $ 14,000,000      
CECONY | Gas | Rate Plan for Year 2 | Scenario, Forecast                                            
Public Utilities, General Disclosures [Line Items]                                            
Base rate changes                                 173,000,000          
Amortizations to income of net regulatory (assets) and liabilities                                 24,000,000          
Potential Penalty Expense                                 119,000,000          
Weighted average cost of capital (after-tax)                                 $ 10,428,000,000          
Weighted average cost of capital (after-tax) (percent)                                 6.79%          
Actual return on common equity (percent)                                 9.82%          
Cost of long-term debt rate                                 4.54%          
CECONY | Gas | Rate Plan for Year 2 | Scenario, Forecast | Protected Portion                                            
Public Utilities, General Disclosures [Line Items]                                            
Increase in regulatory liability resulting from TCJA                                 $ 10,000,000          
CECONY | Gas | Rate Plan for Year 3                                            
Public Utilities, General Disclosures [Line Items]                                            
Base rate changes                                     167,000,000      
Amortizations to income of net regulatory (assets) and liabilities                                     10,000,000      
Potential Penalty Expense                                     96,000,000      
Weighted average cost of capital (after-tax)                                     $ 8,622,000,000      
Weighted average cost of capital (after-tax) (percent)                                     6.61%      
Actual return on common equity (percent)                                     8.93%      
Cost of long-term debt rate           4.63%                         4.63%     4.63%
Requested rate increase (decrease), amount                                       10,400,000    
CECONY | Gas | Rate Plan for Year 3 | Protected Portion                                            
Public Utilities, General Disclosures [Line Items]                                            
Increase in regulatory liability resulting from TCJA                                     $ 12,000,000      
CECONY | Gas | Rate Plan for Year 3 | Scenario, Forecast                                            
Public Utilities, General Disclosures [Line Items]                                            
Base rate changes                                 122,000,000          
Amortizations to income of net regulatory (assets) and liabilities                                 (11,000,000)          
Potential Penalty Expense                                 130,000,000          
Weighted average cost of capital (after-tax)                                 $ 11,063,000,000          
Weighted average cost of capital (after-tax) (percent)                                 6.85%          
Cost of long-term debt rate                                 4.64%          
CECONY | Gas | Rate Plan for Year 3 | Scenario, Forecast | Protected Portion                                            
Public Utilities, General Disclosures [Line Items]                                            
Increase in regulatory liability resulting from TCJA                                 $ 10,000,000          
O&R | Gas | Scenario, Forecast                                            
Public Utilities, General Disclosures [Line Items]                                            
Authorized return on common equity (percent)   10.10% 10.10%                                      
Common equity ratio (percent) 48.00% 48.00% 48.00%                       48.00%              
Requested rate increase (decrease), amount $ 166,000,000 $ 266,000,000 $ 441,000,000                                      
O&R | Gas | Rate Plan for Year 1                                            
Public Utilities, General Disclosures [Line Items]                                            
Base rate changes                                   $ 700,000        
Authorized return on common equity (percent)       9.20%                                    
Requested rate increase (decrease), amount                                       4,400,000    
Deferral, annual maximum (not more than) (percent)                                   0.10%        
O&R | Gas | Rate Plan for Year 1 | Scenario, Forecast                                            
Public Utilities, General Disclosures [Line Items]                                            
Base rate changes                             $ 3,600,000              
Authorized return on common equity (percent)                             9.75%              
O&R | Gas | Rate Plan for Year 2                                            
Public Utilities, General Disclosures [Line Items]                                            
Base rate changes                                   $ 7,400,000        
Requested rate increase (decrease), amount                                       4,400,000    
Deferral, annual maximum (not more than) (percent)                                   0.075%        
O&R | Gas | Rate Plan for Year 2 | Scenario, Forecast                                            
Public Utilities, General Disclosures [Line Items]                                            
Base rate changes                             $ 18,000,000              
O&R | Gas | Rate Plan for Year 3                                            
Public Utilities, General Disclosures [Line Items]                                            
Base rate changes                                   $ 9,900,000        
Requested rate increase (decrease), amount                                       $ 4,400,000    
Deferral, annual maximum (not more than) (percent)                                   0.05%        
O&R | Gas | Rate Plan for Year 3 | Scenario, Forecast                                            
Public Utilities, General Disclosures [Line Items]                                            
Base rate changes                             $ 16,500,000