Derivative Instruments - Effect of Derivative Instruments on the Condensed Consolidated Statement of Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Effect of derivative instruments on the Consolidated Balance Sheet
Total	$ 62	$ 64	$ 182	$ 48
Oil contracts
Effect of derivative instruments on the Consolidated Balance Sheet
Cash received on settlement of derivative instruments	10	1	22	0
Unrealized Gain (Loss) on Derivatives	(25)	48	63	14
Gas contracts
Effect of derivative instruments on the Consolidated Balance Sheet
Cash received on settlement of derivative instruments	26	27	27	90
Unrealized Gain (Loss) on Derivatives	$ 51	$ (12)	$ 70	$ (56)