Hedging Activities and Fair Value Measurements - Schedule of Derivative Fair Value Amounts (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Commodity Derivative Instruments
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 707	$ 460
Liability Derivatives	680	363
Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Asset Derivatives	489	429
Liability Derivatives	470	325
Derivatives designated as hedging instruments | Commodity Derivative Instruments
Derivatives, Fair Value [Line Items]
Asset Derivatives	489	429
Liability Derivatives	470	325
Derivatives designated as hedging instruments | Commodity Derivative Instruments | Location, Statement of Financial Position, Balance [Axis]: us-gaap:AssetsCurrent
Derivatives, Fair Value [Line Items]
Asset Derivatives	443	403
Derivatives designated as hedging instruments | Commodity Derivative Instruments | Location, Statement of Financial Position, Balance [Axis]: us-gaap:LiabilitiesCurrent
Derivatives, Fair Value [Line Items]
Liability Derivatives	439	312
Derivatives designated as hedging instruments | Commodity Derivative Instruments | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsNoncurrent
Derivatives, Fair Value [Line Items]
Asset Derivatives	46	26
Derivatives designated as hedging instruments | Commodity Derivative Instruments | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherLiabilitiesNoncurrent
Derivatives, Fair Value [Line Items]
Liability Derivatives	31	13
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Asset Derivatives	218	31
Liability Derivatives	210	38
Derivatives not designated as hedging instruments | Commodity Derivative Instruments
Derivatives, Fair Value [Line Items]
Asset Derivatives	218	31
Liability Derivatives	210	38
Derivatives not designated as hedging instruments | Commodity Derivative Instruments | Location, Statement of Financial Position, Balance [Axis]: us-gaap:AssetsCurrent
Derivatives, Fair Value [Line Items]
Asset Derivatives	216	31
Derivatives not designated as hedging instruments | Commodity Derivative Instruments | Location, Statement of Financial Position, Balance [Axis]: us-gaap:LiabilitiesCurrent
Derivatives, Fair Value [Line Items]
Liability Derivatives	203	35
Derivatives not designated as hedging instruments | Commodity Derivative Instruments | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsNoncurrent
Derivatives, Fair Value [Line Items]
Asset Derivatives	2	0
Derivatives not designated as hedging instruments | Commodity Derivative Instruments | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherLiabilitiesNoncurrent
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 7	$ 3