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Investments (Investments Under Equity Method of Accounting) (Parenthetical) (Detail) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |
Assets held for sale | $ 0 | $ 18,577
Other Investment |  |
Schedule of Equity Method Investments [Line Items] |  |
Assets held for sale |  | 43
Atlantic Coast Pipeline | Other Current Liabilities |  |
Schedule of Equity Method Investments [Line Items] |  |
Liability associated with its investment | $ 7 | $ 4

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