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Investments (Investments Under Equity Method of Accounting) (Parenthetical) (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |
Current assets held for sale | $ 18,529 |  | $ 1,785
Noncurrent assets held for sale |  |  | 18,831
Other Investment |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Current assets held for sale | 43 |  | 43
Noncurrent assets held for sale | 43 |  | 43
Cove Point |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Noncurrent assets held for sale |  |  | 2,700
Cove Point | Limited Partnership Interest |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Percentage of noncontrolling limited partnership interest retained |  | 50.00% |
Atlantic Coast Pipeline | Other Current Liabilities |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Liability associated with its investment | $ 4 |  | $ 114

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