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Fair Value Measurements (Assets and Liabilities Accounted for at Fair Value on Recurring Basis) (Detail) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash collateral netted with derivative liabilities $ 42 $ 12
Fair Value, Recurring | Commodity derivatives    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commodity derivative instruments, assets - netting and collateral (337) (132)
Derivative asset, net carrying value on balance sheet 52 7
Commodity derivative instruments, assets - collateral pledged not offset 23 16
Commodity derivative instruments, liabilities - netting and collateral (379) (144)
Derivative liability, net carrying value on balance sheet 0 0
Commodity derivative instruments, liabilities - collateral pledged not offset 0 0
Fair Value, Recurring | Embedded derivatives in commodity contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commodity derivative instruments, liabilities - netting and collateral 0 0
Derivative liability, net carrying value on balance sheet 55 58
Commodity derivative instruments, liabilities - collateral pledged not offset 0 0
Fair Value, Recurring | Level 1 | Commodity derivatives    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commodity derivative instruments, assets - gross 389 139
Commodity derivative instruments, liabilities - gross 379 144
Fair Value, Recurring | Level 1 | Embedded derivatives in commodity contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commodity derivative instruments, liabilities - gross 0 0
Fair Value, Recurring | Level 2 | Commodity derivatives    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commodity derivative instruments, assets - gross 0 0
Commodity derivative instruments, liabilities - gross 0 0
Fair Value, Recurring | Level 2 | Embedded derivatives in commodity contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commodity derivative instruments, liabilities - gross 0 0
Fair Value, Recurring | Level 3 | Commodity derivatives    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commodity derivative instruments, assets - gross 0 0
Commodity derivative instruments, liabilities - gross 0 0
Fair Value, Recurring | Level 3 | Embedded derivatives in commodity contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commodity derivative instruments, liabilities - gross $ 55 $ 58