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Stock-Based Compensation - Additional Information (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Income tax benefit realized from stock options exercised | $ 5,000,000 | $ 13,000,000 | $ 4,000,000
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 | $ 4,000,000 | 11,000,000 | 4,000,000
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 | $ 21,000,000 |  |
Nonvested awards, compensation cost not yet recognized, period for recognition (years) | 1 year |  |
Payment for settlement of vested units | $ 21,000,000 | 24,000,000 | 29,000,000
Performance RSUs | CECONY |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense to be recognized | $ 17,000,000 |  |
Nonvested awards, compensation cost not yet recognized, period for recognition (years) | 1 year |  |
Payment for settlement of vested units | $ 18,000,000 | 22,000,000 | 28,000,000
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] |  |  |
Compensation expense to be recognized | $ 2,000,000 |  |
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) | $ 78.00 |  |
Time-based Awards | CECONY |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense to be recognized | $ 2,000,000 |  |
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) | $ 78.00 |  |
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) | $ 79.98 |  |
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) | $ 79.70 |  |
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) | $ 90.48 |  |
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) | $ 89.65 |  |
LTIP |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of units issued (in shares) | 33,200 |  |
Weighted average grant date price per share (in dollars per share) | $ 74.32 |  |
Stock Purchase Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares purchased on the open market | 836,984 | 747,899 | 786,385
Weighted average share price per share, on shares purchased on open market (in dollars per share) | $ 79.82 | $ 85.45 | $ 78.27

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