Acquisitions, Divestitures and Restructuring Activities - Schedule of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions		9 Months Ended
	May 04, 2021	Sep. 30, 2021	Sep. 30, 2020	Jan. 12, 2021
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Cash used in acquisitions, net of cash acquired		$ 826	$ 0
Parsley
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Cash and cash equivalents (a)				$ 118
Accounts receivable				253
Derivatives				8
Proved properties				5,110
Unproved properties				5,636
Other property and equipment				118
Operating lease right-of-use assets				201
Other assets				22
Total assets acquired				11,466
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Accounts payable				337
Interest payable				49
Derivatives				317
Operating leases				201
Deferred income taxes				140
Long-term debt				3,238
Other liabilities				301
Total liabilities assumed				(4,583)
Net assets acquired				$ 6,883
Cash used in acquisitions, net of cash acquired	$ 2
Double Eagle III Midco 1 LLC
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Cash and cash equivalents (a)	58
Accounts receivable	131
Derivatives	0
Proved properties	3,929
Unproved properties	2,406
Other property and equipment	72
Operating lease right-of-use assets	2
Other assets	11
Total assets acquired	6,609
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Accounts payable	232
Interest payable	22
Derivatives	86
Operating leases	2
Deferred income taxes	0
Long-term debt	975
Other liabilities	58
Total liabilities assumed	(1,375)
Net assets acquired	5,234
Cash used in acquisitions, net of cash acquired	$ 1,000