DEBT AND FINANCING COSTS - Schedule of Debt (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Finance lease obligations	$ 37	$ 38
Unamortized discount	(34)	(35)
Debt issuance costs	(55)	(57)
Total debt	8,715	8,772
Current maturities	(2)	(2)
Long-term debt	8,713	8,770
Notes and debentures
Debt Instrument [Line Items]
Debt instrument, fair value	8,000	8,500
Notes and debentures \| Unsecured Debt
Debt Instrument [Line Items]
Long-term debt, gross	8,045	8,052
Altus credit facility \| Line of Credit
Debt Instrument [Line Items]
Long-term debt, gross	657	624
Apache credit facility \| Line of Credit
Debt Instrument [Line Items]
Long-term debt, gross	$ 65	$ 150

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, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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