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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Effect of derivative instruments on the Consolidated Balance Sheet
Total	$ 64	$ 3	$ 48	$ 129
Gas contracts
Effect of derivative instruments on the Consolidated Balance Sheet
Cash received on settlement of derivative instruments	27	55	90	235
Non-cash gain (loss) on derivative instruments	(12)	(40)	(56)	(93)
Oil contracts
Effect of derivative instruments on the Consolidated Balance Sheet
Cash received on settlement of derivative instruments	1	0	0	3
Non-cash gain (loss) on derivative instruments	$ 48	$ (12)	$ 14	$ (16)