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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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