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Investments (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Feb. 29, 2024
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) from equity method investees |  | $ 0 | [1] | $ 1 | [1] | $ (8) | [2] | $ 0 | [2] |  |
Net earnings (losses) from discontinued operations including noncontrolling interest | [3] | 0 |  | (15) |  | 0 |  | 200 |  |  |
Distributions received from investment |  |  |  |  |  | 4 |  | 138 |  |  |
Equity method affiliates includes cash and accrued amounts of contributions |  |  |  |  |  | 12 |  | 6 |  |  |
Investment company received distribution amount |  |  |  |  |  |  |  |  |  |  | $ 126
Discontinued operations |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net earnings (losses) from discontinued operations including noncontrolling interest |  |  |  |  |  | (2) |  | (11) |  |  |
Atlantic Coast Pipeline |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) from equity method investees |  |  |  |  |  | (2) |  | (12) |  |  |
Atlantic Coast Pipeline | Other Current Liabilities |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Current liabilities |  | 2 |  |  |  | 2 |  |  |  | $ 7 |
Finite Lived Equity Method Investment Basis Difference |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying amount of investment that exceeded share of underlying equity |  | 3 |  |  |  | 3 |  |  |  | 5 |
Trading Securities |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Rabbi trust securities |  | 173 |  |  |  | $ 173 |  |  |  | $ 160 |
Maximum |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) from equity method investees |  |  |  |  |  |  |  | $ 1 |  |  |
Maximum | Atlantic Coast Pipeline |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) from equity method investees |  | $ (1) |  | $ (1) |  |  |  |  |  |  |
[1] | Items designated are other segment items for each reportable segment.
[2] | Items designated are other segment items for each reportable segment.
[3] | Includes income tax expense (benefit) of $(2) million and $(9) million for the three months ended September 30, 2025 and 2024, respectively, and $(5) million and $31 million for the nine months ended September 30, 2025 and 2024, respectively.

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