Hedging Activities and Fair Value Measurements - Schedule of Derivative Fair Value Amounts (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Commodity Derivative Instruments
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 719	$ 575
Liability Derivatives	647	495
Derivatives designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Asset Derivatives	260	232
Liability Derivatives	228	182
Derivatives designated as hedging instruments: | Commodity Derivative Instruments
Derivatives, Fair Value [Line Items]
Asset Derivatives	260	232
Liability Derivatives	228	182
Derivatives designated as hedging instruments: | Commodity Derivative Instruments | Current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	232	210
Derivatives designated as hedging instruments: | Commodity Derivative Instruments | Current liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	209	178
Derivatives designated as hedging instruments: | Commodity Derivative Instruments | Other assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	28	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	459	343
Liability Derivatives	419	313
Derivatives not designated as hedging instruments: | Commodity Derivative Instruments
Derivatives, Fair Value [Line Items]
Asset Derivatives	459	343
Liability Derivatives	419	313
Derivatives not designated as hedging instruments: | Commodity Derivative Instruments | Current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	457	324
Derivatives not designated as hedging instruments: | Commodity Derivative Instruments | Current liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	418	293
Derivatives not designated as hedging instruments: | Commodity Derivative Instruments | Other assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	2	19
Derivatives not designated as hedging instruments: | Commodity Derivative Instruments | Other liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 1	$ 20