Natural Gas and Oil Property Transactions - Purchase Price Allocation (Details) - USD ($) $ in Millions			3 Months Ended
	Oct. 01, 2024	Mar. 09, 2022	Dec. 31, 2024
Southwestern
Consideration:
Cash	$ 585
Fair value of common stock issued in the merger	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
Southwestern | 2022 Southwestern's Revolving Credit Facility
Fair Value of Liabilities Assumed:
Repayment of revolving credit facility			$ 585
Accrued interest and fees			$ 2
Marcellus
Consideration:
Cash		$ 2,000
Fair value of common stock issued in the merger		764
Working capital adjustments		6
Total consideration		2,770
Fair Value of Assets Acquired:
Cash, cash equivalents and restricted cash		39
Other current assets		218
Proved natural gas and oil properties		2,309
Unproved properties		788
Other property and equipment		1
Other long-term assets		3
Amounts attributable to assets acquired		3,358
Fair Value of Liabilities Assumed:
Current liabilities		459
Other long-term liabilities		129
Amounts attributable to liabilities assumed		588
Total identifiable net assets		$ 2,770