Investments (Narrative) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Feb. 29, 2024
Schedule of Equity Method Investments [Line Items]
Earnings (loss) from equity method investees	[1]	$ (7)
Net earnings (losses) from discontinued operations including noncontrolling interest	[2]	(1)	$ 118
Distributions received from investment			131
Equity method affiliates includes cash and accrued amounts of contributions		1	3
Investment company received distribution amount					$ 126
Discontinued operations
Schedule of Equity Method Investments [Line Items]
Net earnings (losses) from discontinued operations including noncontrolling interest			(10)
Atlantic Coast Pipeline
Schedule of Equity Method Investments [Line Items]
Earnings (loss) from equity method investees			(11)
Atlantic Coast Pipeline | Other Current Liabilities
Schedule of Equity Method Investments [Line Items]
Current liabilities		6		$ 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		2	5
Trading Securities
Schedule of Equity Method Investments [Line Items]
Rabbi trust securities		162		$ 160
Maximum
Schedule of Equity Method Investments [Line Items]
Earnings (loss) from equity method investees			$ 1
Distributions received from investment		1
Maximum | Discontinued operations
Schedule of Equity Method Investments [Line Items]
Net earnings (losses) from discontinued operations including noncontrolling interest		(1)
Maximum | Atlantic Coast Pipeline
Schedule of Equity Method Investments [Line Items]
Earnings (loss) from equity method investees		$ (1)

[1] Items designated are other segment items for each reportable segment.

[2] Includes income tax expense of less than $1 million and $54 million for the three months ended March 31, 2025 and 2024, respectively.