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Regulatory Matters - Summary of Utilities Rate Plans (CECONY-Steam) (Details) - CECONY - Steam - USD ($)
12 Months Ended 36 Months Ended 108 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2022
Public Utilities, General Disclosures [Line Items]                      
Amortizations to income of net regulatory (assets) and liabilities                   $ 37,000,000  
Regulatory liabilities, amortization period                   3 years  
Negative revenue adjustments                     $ 0
Cost reconciliation, deferred net regulatory liabilities       $ 8,000,000   $ 14,000,000 $ 8,000,000   $ 42,000,000 $ 8,000,000  
Cost reconciliation, deferred net regulatory assets $ 11,000,000 $ 32,000,000 $ 35,000,000   $ 1,000,000     $ 17,000,000     $ 11,000,000
Increase (decrease) in regulatory liabilities (100,000) (1,000,000) (2,000,000)           0    
Authorized return on common equity (percent)                   9.30%  
Earnings sharing (percent)         9.90%            
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, positive adjustment         $ 2,300,000 $ 1,100,000 4,000,000        
Earnings sharing, additional adjustment   $ 200,000         400,000        
Common equity ratio (percent)                   48.00%  
Other regulatory liabilities             $ 8,000,000     $ 8,000,000  
Difference in property taxes (percent)                   90.00%  
Deferral, annual maximum (not more than) (percent)                   10.00%  
Maximum                      
Public Utilities, General Disclosures [Line Items]                      
Potential penalties (annually)                   $ 1,000,000  
Rate Plan for Year 1                      
Public Utilities, General Disclosures [Line Items]                      
Base rate changes                   (22,400,000)  
Average rate base                   $ 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%     5.17%  
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  
Average rate base                   $ 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%     5.23%  
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  
Average rate base                   $ 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%     5.39%  
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  
Year 4                      
Public Utilities, General Disclosures [Line Items]                      
Base rate changes                   $ 0  
Actual return on common equity (percent)                   9.51%  
Year 5                      
Public Utilities, General Disclosures [Line Items]                      
Base rate changes                   $ 0  
Actual return on common equity (percent)                   11.73%  
Year 6                      
Public Utilities, General Disclosures [Line Items]                      
Base rate changes                   $ 0  
Actual return on common equity (percent)                   10.45%  
Year 7                      
Public Utilities, General Disclosures [Line Items]                      
Base rate changes                   $ 0  
Actual return on common equity (percent)                   7.91%  
Year 8                      
Public Utilities, General Disclosures [Line Items]                      
Base rate changes                   $ 0  
Actual return on common equity (percent)                   5.99%  
Year 9                      
Public Utilities, General Disclosures [Line Items]                      
Actual return on common equity (percent)                   5.72%