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Summary of Significant Accounting Policies and Other Matters - Narrative (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 USD ($) mi | Sep. 30, 2025 USD ($) shares | Sep. 30, 2024 shares | Sep. 30, 2025 USD ($) shares | Sep. 30, 2024 shares
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Anti-dilutive effect (shares) | shares |  | 0 | 0 | 0 | 0
Mountain Valley Pipeline LLC | Con Edison Gas Pipeline and Storage, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Number of miles in pipeline construction | mi | 303 |  |  |  |
Aggregate project cost | $ 8,100 |  |  |  |
Equity method investment, ownership percent (in percent) |  | 6.60% |  | 6.60% |
Equity method investments |  | $ 162 |  | $ 162 |
Cash contributions for equity method investments |  |  |  | 530 |
Earnings from its equity investment |  | 8 |  | 22 |
Earnings from its equity investment, after tax |  | $ 6 |  | $ 16 |

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