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Stock-Based Compensation - Additional Information (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
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% |  |
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 | $ 15,000,000 |  |
Nonvested awards, compensation cost not yet recognized, period for recognition (years) | 1 year |  |
Payment for settlement of vested units | $ 30,000,000 | $ 21,000,000 | $ 10,000,000
Performance RSUs | CECONY |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense to be recognized | $ 14,000,000 |  |
Nonvested awards, compensation cost not yet recognized, period for recognition (years) | 1 year |  |
Payment for settlement of vested units | $ 27,000,000 | 19,000,000 | 9,000,000
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 | $ 18,000,000 |  |
Nonvested awards, compensation cost not yet recognized, period for recognition (years) | 2 years |  |
Payment for settlement of vested units | $ 2,000,000 | 2,000,000 | 2,000,000
Weighted average grant date price per share (in dollars per share) | $ 88.60 |  |
Time-based Awards | CECONY |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense to be recognized | $ 16,000,000 |  |
Nonvested awards, compensation cost not yet recognized, period for recognition (years) | 2 years |  |
Payment for settlement of vested units | $ 2,000,000 | $ 2,000,000 | $ 2,000,000
Weighted average grant date price per share (in dollars per share) | $ 88.72 |  |
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 | 10,000,000 |  |
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) | $ 88.25 |  |
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) | $ 87.96 |  |
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) | $ 88.03 |  |
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) | $ 88.17 |  |
LTIP |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of units issued (in shares) | 33,000 |  |
Weighted average grant date price per share (in dollars per share) | $ 89.23 |  |
Stock Purchase Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares purchased on the open market | 774,338 | 751,702 | 744,932
Weighted average share price per share, on shares purchased on open market (in dollars per share) | $ 94.71 | $ 91.80 | $ 91.59

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