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v3.23.3

Summary of Significant Accounting Policies and Other Matters - Narrative (Details) $ / shares in Units, $ in Millions | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2023 USD ($) | Jan. 31, 2016 mi | Sep. 30, 2023 USD ($) project $ / shares | Dec. 31, 2019 USD ($) | Mar. 01, 2023 project | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Par value of common stock (in usd per share) | $ / shares |  |  | $ 0.10 |  |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations | Clean Energy Businesses |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Tax equity projects | project |  |  | 3 |  | 2 |  |  |
Mountain Valley Pipeline LLC | Con Edison Gas Pipeline and Storage, LLC |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership percentage (in percent) |  |  | 8.80% |  |  | 9.60% | 10.20% | 11.30%
Number of miles in pipeline construction | mi |  | 300 |  |  |  |  |  |
Cash contributions for equity method investments |  |  | $ 530 | $ 530 |  |  |  |
Equity method investment, ownership percentage, expected percentage |  |  | 0.073 |  |  |  |  |
Equity method investment, project percent completion (in percent) |  |  | 94.00% |  |  | 94.00% |  |
Equity method investments |  |  | $ 111 |  |  |  |  |
Mountain Valley Pipeline LLC | Con Edison Gas Pipeline and Storage, LLC | Subsequent Event |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Cash contributions for equity method investments | $ 7,200 |  |  |  |  |  |  |
Mountain Valley Pipeline LLC | Con Edison Gas Pipeline and Storage, LLC | Mountain Valley Pipeline LLC |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership percentage (in percent) |  | 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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