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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