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Stock-Based Compensation - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Income tax benefit realized from stock options exercised $ 13,000,000 $ 4,000,000 $ 25,000,000
Compensation expense to be recognized 3,000,000    
Maximum employer contribution match (up to) 1    
Amount employee contribution for employer match 9    
Maximum employee investment per year (up to) $ 25,000    
Maximum percentage allowed to invest (not more than) 20.00%    
CECONY      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Income tax benefit realized from stock options exercised $ 11,000,000 4,000,000 22,000,000
Compensation expense to be recognized $ 2,000,000    
Performance RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock received upon vesting (in shares) 1    
Compensation expense to be recognized $ 25,000,000    
Nonvested awards, compensation cost not yet recognized, period for recognition (years) 1 year    
Payment for settlement of vested units $ 24,000,000 29,000,000 22,000,000
Performance RSUs | CECONY      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense to be recognized $ 21,000,000    
Nonvested awards, compensation cost not yet recognized, period for recognition (years) 1 year    
Payment for settlement of vested units $ 22,000,000 28,000,000 21,000,000
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period (years) 3 years    
Time-based Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested awards, compensation cost not yet recognized, period for recognition (years) 1 year    
Payment for settlement of vested units $ 1,000,000 1,000,000 1,000,000
Weighted average grant date price per share (in dollars per share) $ 84.81    
Time-based Awards | CECONY      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested awards, compensation cost not yet recognized, period for recognition (years) 1 year    
Payment for settlement of vested units $ 1,000,000 $ 1,000,000 $ 1,000,000
Weighted average grant date price per share (in dollars per share) $ 84.81    
2013 LTIP      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares of common stock that can be awarded under the plan 5,000,000    
TSR Portion | Performance RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Adjustment percentage used for Performance awards 50.00%    
Factor used for adjustment of Performance awards, low end (percent) 0.00%    
Factor used for adjustment of Performance awards, high end (percent) 200.00%    
Weighted average grant date price per share (in dollars per share) $ 64.37    
TSR Portion | Performance RSUs | CECONY      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average grant date price per share (in dollars per share) $ 64.82    
Non-TSR Portion | Performance RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Adjustment percentage used for Performance awards 50.00%    
Factor used for adjustment of Performance awards, low end (percent) 0.00%    
Factor used for adjustment of Performance awards, high end (percent) 200.00%    
Weighted average grant date price per share (in dollars per share) $ 80.03    
Non-TSR Portion | Performance RSUs | CECONY      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average grant date price per share (in dollars per share) $ 80.31    
LTIP      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of units issued (in shares) 27,100    
Weighted average grant date price per share (in dollars per share) $ 87.57    
Stock Purchase Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares purchased on the open market 747,899 786,385 719,125
Weighted average share price per share, on shares purchased on open market (in dollars per share) $ 85.45 $ 78.27 $ 79.57