Other Expense (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	May 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring Charges		$ 79	$ 159	$ 0
Gross vertical integration revenues		42	51	128
Gross vertical costs and expenses		40	66	130
Other Income and Expenses [Abstract]
South Texas deficiency fee obligation, net		80	0	0
Idle drilling and well service equipment charges		80	25	0
Restructuring Charges		79	159	0
Gain (Loss) on Extinguishment of Debt	$ 23	27	0	0
Transportation commitment charges		16	74	161
Legal And Environmental Contingencies		12	19	21
Shortfall Purchase Penalty		5	0	0
Parsley transaction cost		10	0	0
Asset Impairment Charges		3	38	11
Asset divestiture-related charges		0	25	170
Accelerated depreciation		0	23	443
Relocation Costs		(1)	41	0
Loss (income) from vertical integration services		(2)	15	2
Other		12	29	41
Total other expense		$ 321	448	$ 849
Accelerated Depreciation | Headquarter Relocation
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring Charges			28
Other Income and Expenses [Abstract]
Restructuring Charges			28
Exit and Relocation Cost | Headquarter Relocation
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring Charges			12
Other Income and Expenses [Abstract]
Restructuring Charges			$ 12