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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.