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CONSOLIDATED BALANCE SHEETS (Parenthetical)
$ in Millions
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Statement of Financial Position [Abstract]    
Preferred stock, par value (in usd per share) | $ / shares $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) | shares 20,000,000 20,000,000
Preferred stock, shares outstanding (in shares) | shares 5,563,458 5,563,458
Common stock, par value (in usd per share) | $ / shares $ 0.01 $ 0.01
Common stock, shares authorized (in shares) | shares 22,500,000 15,000,000
Common stock, shares issued (in shares) | shares 9,780,547 9,772,793
Treasury stock, common shares (in shares) | shares 0 26,224
Cash and cash equivalents $ 279 $ 6
Proved oil and natural gas properties 25,734 30,765
Accumulated depreciation, depletion and amortization (23,806) (20,002)
Other current liabilities 723 1,432
Variable Interest Entities, Primary Beneficiary    
Cash and cash equivalents 0 2
Proved oil and natural gas properties 0 755
Accumulated depreciation, depletion and amortization 0 (713)
Other current liabilities $ 0 $ 1