Hedging Activities and Fair Value Measurements - Schedule of Derivative Fair Value Amounts (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Commodity Derivative Instruments
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 476	$ 575
Liability Derivatives	418	495
Derivatives designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Asset Derivatives	281	232
Liability Derivatives	221	182
Derivatives designated as hedging instruments: | Commodity Derivative Instruments
Derivatives, Fair Value [Line Items]
Asset Derivatives	281	232
Liability Derivatives	221	182
Derivatives designated as hedging instruments: | Commodity Derivative Instruments | Current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	258	210
Derivatives designated as hedging instruments: | Commodity Derivative Instruments | Current liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	202	178
Derivatives designated as hedging instruments: | Commodity Derivative Instruments | Other assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	23	22
Derivatives designated as hedging instruments: | Commodity Derivative Instruments | Other liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	19	4
Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Asset Derivatives	195	343
Liability Derivatives	197	313
Derivatives not designated as hedging instruments: | Commodity Derivative Instruments
Derivatives, Fair Value [Line Items]
Asset Derivatives	195	343
Liability Derivatives	197	313
Derivatives not designated as hedging instruments: | Commodity Derivative Instruments | Current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	194	324
Derivatives not designated as hedging instruments: | Commodity Derivative Instruments | Current liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	196	293
Derivatives not designated as hedging instruments: | Commodity Derivative Instruments | Other assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	1	19
Derivatives not designated as hedging instruments: | Commodity Derivative Instruments | Other liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 1	$ 20