Natural Gas and Oil Property Transactions - Schedule of the Allocation of the Total Purchase Price (Details) - Southwestern $ in Millions	Oct. 01, 2024 USD ($)
Consideration:
Cash	$ 585
Fair value of Expand Energy common stock issued	7,871
Restricted stock unit and performance stock unit replacement awards	17
Total consideration	8,473
Fair Value of Assets Acquired:
Cash and cash equivalents and restricted cash	126
Other current assets	828
Proved natural gas and oil properties	10,002
Unproved properties	4,270
Other property and equipment	128
Other long-term assets	496
Amounts attributable to assets acquired	15,850
Fair Value of Liabilities Assumed:
Current liabilities	1,955
Long-term debt	3,305
Deferred tax liabilities	479
Long-term contract liabilities	1,287
Other long-term liabilities	351
Amounts attributable to liabilities assumed	7,377
Total identifiable net assets	8,473
2022 Southwestern's Revolving Credit Facility
Fair Value of Liabilities Assumed:
Repayment of revolving credit facility	585
Accrued interest and fees	$ 2