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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

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