GUARANTOR FINANCIAL STATEMENTS - Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 123	$ 215
Restricted cash	5	0
Accounts receivable, net	615	392
Accounts receivable - related party		0
Intercompany receivable	0	0
Inventories	37	37
Derivative instruments	46	231
Prepaid expenses and other	43	50
Total current assets	869	925
Property and equipment:
Oil and natural gas properties, full cost method of accounting	25,782	22,299
Midstream assets	931	700
Other property, equipment and land	125	147
Accumulated depletion, depreciation, amortization and impairment	(5,003)	(2,774)
Net property and equipment	21,835	20,372
Equity method investments	479	1
Derivative instruments	7	0
Investment in subsidiaries	0	0
Investment in real estate, net	109	116
Deferred tax asset	142	97
Other assets	90	85
Total assets	23,531	21,596	$ 7,771
Current liabilities:
Accounts payable-trade	179	128
Intercompany payable	0	0
Accrued capital expenditures	475	495
Other accrued liabilities	304	253
Revenues and royalties payable	278	143
Derivative instruments	27	0
Total current liabilities	1,263	1,019
Long-term debt	5,371	4,464
Derivative instruments	0	15
Asset retirement obligations	94	136	20
Deferred income taxes	1,886	1,785
Other long-term liabilities	11	10
Total liabilities	8,625	7,429
Commitments and contingencies
Stockholders’ equity:
Stockholders’ equity	13,249	13,700
Non-controlling interest	1,657	467
Total equity	14,906	14,167	$ 5,581	$ 4,018
Total liabilities and equity	23,531	21,596
Eliminations
Current assets:
Cash and cash equivalents	0	0
Restricted cash	0
Accounts receivable, net	0	0
Accounts receivable - related party		(4)
Intercompany receivable	(5,903)	(4,670)
Inventories	0	0
Derivative instruments	0	0
Prepaid expenses and other	19	0
Total current assets	(5,884)	(4,674)
Property and equipment:
Oil and natural gas properties, full cost method of accounting	(201)	(3)
Midstream assets	0	0
Other property, equipment and land	0	0
Accumulated depletion, depreciation, amortization and impairment	(5)	(12)
Net property and equipment	(206)	(15)
Equity method investments	0	0
Derivative instruments	0
Investment in subsidiaries	(10,414)	(12,801)
Investment in real estate, net	0	0
Deferred tax asset	0	0
Other assets	(230)	0
Total assets	(16,734)	(17,490)
Current liabilities:
Accounts payable-trade	0	0
Intercompany payable	(5,903)	(4,673)
Accrued capital expenditures	0	0
Other accrued liabilities	0	0
Revenues and royalties payable	0	0
Derivative instruments	1
Total current liabilities	(5,902)	(4,673)
Long-term debt	0	0
Derivative instruments		0
Asset retirement obligations	0	0
Deferred income taxes	0	0
Other long-term liabilities	0	0
Total liabilities	(5,902)	(4,673)
Commitments and contingencies
Stockholders’ equity:
Stockholders’ equity	(10,543)	(12,589)
Non-controlling interest	(289)	(228)
Total equity	(10,832)	(12,817)
Total liabilities and equity	(16,734)	(17,490)
Parent | Reportable Legal Entities
Current assets:
Cash and cash equivalents	93	84
Restricted cash	5
Accounts receivable, net	0	0
Accounts receivable - related party		0
Intercompany receivable	5,331	4,469
Inventories	0	0
Derivative instruments	0	0
Prepaid expenses and other	2	2
Total current assets	5,431	4,555
Property and equipment:
Oil and natural gas properties, full cost method of accounting	0	0
Midstream assets	0	0
Other property, equipment and land	0	0
Accumulated depletion, depreciation, amortization and impairment	0	0
Net property and equipment	0	0
Equity method investments	0	0
Derivative instruments	0
Investment in subsidiaries	10,414	12,689
Investment in real estate, net	0	0
Deferred tax asset	0	0
Other assets	0	0
Total assets	15,845	17,244
Current liabilities:
Accounts payable-trade	0	0
Intercompany payable	0	0
Accrued capital expenditures	0	0
Other accrued liabilities	17	14
Revenues and royalties payable	0	0
Derivative instruments	0
Total current liabilities	17	14
Long-term debt	3,769	2,036
Derivative instruments		0
Asset retirement obligations	0	0
Deferred income taxes	470	382
Other long-term liabilities	0	0
Total liabilities	4,256	2,432
Commitments and contingencies
Stockholders’ equity:
Stockholders’ equity	11,589	14,812
Non-controlling interest	0	0
Total equity	11,589	14,812
Total liabilities and equity	15,845	17,244
Guarantor Subsidiaries | Reportable Legal Entities
Current assets:
Cash and cash equivalents	0	2
Restricted cash	0
Accounts receivable, net	248	143
Accounts receivable - related party		0
Intercompany receivable	0	0
Inventories	1	2
Derivative instruments	46	197
Prepaid expenses and other	1	0
Total current assets	296	344
Property and equipment:
Oil and natural gas properties, full cost method of accounting	13,276	11,170
Midstream assets	0	21
Other property, equipment and land	0	1
Accumulated depletion, depreciation, amortization and impairment	(3,167)	(2,432)
Net property and equipment	10,109	8,760
Equity method investments	0	0
Derivative instruments	7
Investment in subsidiaries	0	0
Investment in real estate, net	0	0
Deferred tax asset	0	0
Other assets	10	10
Total assets	10,422	9,114
Current liabilities:
Accounts payable-trade	0	0
Intercompany payable	5,930	3,939
Accrued capital expenditures	0	0
Other accrued liabilities	132	23
Revenues and royalties payable	0	0
Derivative instruments	18
Total current liabilities	6,080	3,962
Long-term debt	13	1,490
Derivative instruments		11
Asset retirement obligations	34	30
Deferred income taxes	0	0
Other long-term liabilities	0	0
Total liabilities	6,127	5,493
Commitments and contingencies
Stockholders’ equity:
Stockholders’ equity	4,295	3,621
Non-controlling interest	0	0
Total equity	4,295	3,621
Total liabilities and equity	10,422	9,114
Non-Guarantor Subsidiaries | Reportable Legal Entities
Current assets:
Cash and cash equivalents	30	129
Restricted cash	0
Accounts receivable, net	367	249
Accounts receivable - related party		4
Intercompany receivable	572	201
Inventories	36	35
Derivative instruments	0	34
Prepaid expenses and other	21	48
Total current assets	1,026	700
Property and equipment:
Oil and natural gas properties, full cost method of accounting	12,707	11,132
Midstream assets	931	679
Other property, equipment and land	125	146
Accumulated depletion, depreciation, amortization and impairment	(1,831)	(330)
Net property and equipment	11,932	11,627
Equity method investments	479	1
Derivative instruments	0
Investment in subsidiaries	0	112
Investment in real estate, net	109	116
Deferred tax asset	142	97
Other assets	310	75
Total assets	13,998	12,728
Current liabilities:
Accounts payable-trade	179	128
Intercompany payable	(27)	734
Accrued capital expenditures	475	495
Other accrued liabilities	155	216
Revenues and royalties payable	278	143
Derivative instruments	8
Total current liabilities	1,068	1,716
Long-term debt	1,589	938
Derivative instruments		4
Asset retirement obligations	60	106
Deferred income taxes	1,416	1,403
Other long-term liabilities	11	10
Total liabilities	4,144	4,177
Commitments and contingencies
Stockholders’ equity:
Stockholders’ equity	7,908	7,856
Non-controlling interest	1,946	695
Total equity	9,854	8,551
Total liabilities and equity	$ 13,998	$ 12,728