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Summary of Significant Accounting Policies and Other Matters - Narrative (Details) shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2016 mi | Mar. 31, 2023 project shares | Mar. 31, 2022 shares | Mar. 01, 2023 project | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Antidilutive shares (in shares) | shares |  | 1.9 | 0.0 |  |  |  |  |
Mountain Valley Pipeline LLC | Con Edison Gas Pipeline and Storage, LLC |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership percentage |  | 9.50% |  |  |  | 10.20% | 11.30% |
Number of miles in pipeline construction | mi | 300 |  |  |  |  |  |  |
Equity method investments | $ |  |  |  |  |  |  |  | $ 530
Equity method investment, ownership percentage, expected percentage |  | 0.08 |  |  |  |  |  |
Equity method investment, project percent completion |  | 94.00% |  |  | 94.00% |  |  |
Mountain Valley Pipeline LLC | Con Edison Gas Pipeline and Storage, LLC | Mountain Valley Pipeline LLC |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership percentage | 12.50% |  |  |  |  |  |  |
Broken Bow II | Clean Energy Businesses | Electric Energy (MWh) |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Deferred projects | project |  | 1 |  | 1 |  |  |  |

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