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Consolidated Statements of Operations - USD ($)
 2 Months Ended 10 Months Ended 12 Months Ended
Dec. 31, 2020
Oct. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
REVENUES        
Oil and natural gas sales $ 237,000,000 $ 1,092,000,000 $ 2,270,000,000 $ 2,590,000,000
Net derivative (loss) gain from commodity contracts (141,000,000) 91,000,000 (59,000,000) 1,000,000
Revenue not from contract with customer 56,000,000 224,000,000 423,000,000 473,000,000
Total revenues 152,000,000 1,407,000,000 2,634,000,000 3,064,000,000
COSTS        
Operating costs 114,000,000 511,000,000 895,000,000 912,000,000
General and administrative expenses 40,000,000 212,000,000 290,000,000 299,000,000
Depreciation, depletion and amortization 34,000,000 328,000,000 471,000,000 502,000,000
Asset impairments 0 1,736,000,000 0 0
Taxes other than on income 10,000,000 134,000,000 157,000,000 149,000,000
Exploration expense 1,000,000 10,000,000 29,000,000 34,000,000
Other expenses, net 17,000,000 89,000,000 54,000,000 52,000,000
Total costs 258,000,000 3,186,000,000 2,205,000,000 2,295,000,000
OPERATING (LOSS) INCOME (106,000,000) (1,779,000,000) 429,000,000 769,000,000
NON-OPERATING (LOSS) INCOME        
Reorganization items, net (3,000,000) 4,060,000,000 0 0
Interest and debt expense, net (11,000,000) (206,000,000) (383,000,000) (379,000,000)
Net gain on early extinguishment of debt 0 5,000,000 126,000,000 57,000,000
Gain on asset divestitures 0 0 0 5,000,000
Other non-operating expenses (5,000,000) (84,000,000) (72,000,000) (23,000,000)
(LOSS) INCOME BEFORE INCOME TAXES (125,000,000) 1,996,000,000 100,000,000 429,000,000
Income tax provision 0 0 (1,000,000) 0
NET (LOSS) INCOME (125,000,000) 1,996,000,000 99,000,000 429,000,000
NET LOSS (INCOME) ATTRIBUTABLE TO NONCONTROLLING INTERESTS        
Mezzanine equity 0 (94,000,000) (117,000,000) (99,000,000)
Equity 2,000,000 (13,000,000) (10,000,000) (2,000,000)
Net loss (income) attributable to noncontrolling interests 2,000,000 (107,000,000) (127,000,000) (101,000,000)
NET (LOSS) INCOME ATTRIBUTABLE TO COMMON STOCK $ (123,000,000) $ 1,889,000,000 $ (28,000,000) $ 328,000,000
Net (loss) income attributable to common stock per share        
Basic (in dollars per share) $ (1.48) $ 40.59 $ (0.57) $ 6.77
Diluted (in dollars per share) $ (1.48) $ 40.42 $ (0.57) $ 6.77
Trading revenue        
REVENUES        
Revenue not from contract with customer $ 38,000,000 $ 124,000,000 $ 286,000,000 $ 330,000,000
COSTS        
Cost of sales 24,000,000 78,000,000 201,000,000 250,000,000
Electricity sales        
REVENUES        
Revenue not from contract with customer 15,000,000 86,000,000 112,000,000 111,000,000
Other revenue        
REVENUES        
Revenue not from contract with customer 3,000,000 14,000,000 25,000,000 32,000,000
Electricity cost of sales        
COSTS        
Cost of sales 10,000,000 53,000,000 68,000,000 61,000,000
Transportation costs        
COSTS        
Cost of sales $ 8,000,000 $ 35,000,000 $ 40,000,000 $ 36,000,000