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Material Contingencies - Additional Information (Details) $ in Millions |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 12, 2014 building people | Feb. 28, 2017 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2020 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |
Accrued regulatory liability |  |  | $ 5,174 | $ 5,328 |
Guarantee obligations maximum exposure |  |  | $ 124 | $ 175 |
Payment Guarantee by CET Electric of Contributions to New York Transco LLC |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Estimated project cost (in percent) |  |  | 175.00% |  |
NY Transco | Payment Guarantee by CET Electric of Contributions to New York Transco LLC |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Ownership interest (in percent) |  |  | 45.70% |  |
Manhattan Explosion and Fire |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Number of buildings destroyed by fire | building | 2 |  |  |  |
Number of people died in explosion and fire incident | people | 8 |  |  |  |
Number of people injured in explosion and fire incident (more than) | people | 50 |  |  |  |
Amount of costs that will not recover from customers |  | $ 126 |  |  |
Loss contingency accrual |  |  | $ 40 |  | $ 40
Insurance receivable |  |  | $ 40 |  | $ 40
Manhattan Explosion and Fire | Settlement of Gas Proceedings |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Accrued regulatory liability |  | $ 27 |  |  |

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