DEBT AND FINANCING COSTS - Schedule of Debt (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Finance lease obligations	$ 36,000,000	$ 38,000,000
Unamortized discount	(34,000,000)	(35,000,000)
Debt issuance costs	(54,000,000)	(57,000,000)
Total debt	8,635,000,000	8,772,000,000
Current maturities	(215,000,000)	(2,000,000)
Long-term debt	8,420,000,000	8,770,000,000
Notes and debentures
Debt Instrument [Line Items]
Debt instrument, fair value	8,500,000,000	8,500,000,000
Notes and debentures \| Unsecured Debt
Debt Instrument [Line Items]
Long-term debt, gross	8,030,000,000	8,052,000,000
Altus credit facility \| Line of Credit
Debt Instrument [Line Items]
Long-term debt, gross	657,000,000	624,000,000
Apache credit facility \| Line of Credit
Debt Instrument [Line Items]
Long-term debt, gross	$ 0	$ 150,000,000

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Amount, after accumulated amortization, of debt discount.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Present value of lessee's discounted obligation for lease payments from finance lease.

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Amount of long-term debt and lease obligation, classified as noncurrent.

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