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Summary of Significant Accounting Policies and Other Matters - Investments (Details) - Mountain Valley Pipeline $ in Millions | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2024 mi | Dec. 31, 2024 USD ($) | Dec. 31, 2016 mi | Dec. 31, 2023 USD ($) | Dec. 31, 2021 USD ($) | May 31, 2021 USD ($) | Dec. 31, 2019 USD ($) | Jan. 31, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity method investments |  | $ 530 |  | $ 530 |  |  |  |
CET Gas |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity method investment, ownership percent (in percent) |  | 6.70% |  |  |  |  |  |
Number of miles in pipeline construction | mi | 303 |  | 300 |  |  |  |  |
Equity method investments |  |  |  |  | $ 166 |  | $ 530 |
Aggregate project cost |  | $ 8,100 |  |  |  | $ 8,100 |  |
Payments to acquire equity method investments |  | 530 |  |  |  |  |  |
Income (loss) from equity method investments |  | 29 |  |  |  |  |  |
Income (loss) from equity method Investments, after tax |  | $ 21 |  |  |  |  |  |
Expected reduction in equity interest |  | 6.60% |  |  |  |  |  |
CET Gas | Mountain Valley Pipeline |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity method investment, ownership percent (in percent) |  |  |  |  |  |  |  | 12.50%

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