Derivative Instruments - Effect of Derivative Instruments on the Consolidated Statement of Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income (Expense)
Total	$ 230	$ (463)	$ (221)
Gas contracts
Derivative [Line Items]
Cash received (paid) on settlement of derivative instruments	280	(438)	(307)
Non-cash gain (loss) on derivative instruments	(72)	149	99
Oil contracts
Derivative [Line Items]
Cash received (paid) on settlement of derivative instruments	4	(324)	(124)
Non-cash gain (loss) on derivative instruments	$ 18	$ 150	$ 111