DEBT AND FINANCING COSTS - Schedule of Debt (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Finance lease obligations	$ 38	$ 48
Unamortized discount	(38)	(42)
Debt issuance costs	(48)	(53)
Total debt	8,817	8,566
Current maturities	(294)	(11)
Long-term debt	$ 8,523	$ 8,555
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:LongTermDebtNoncurrent	us-gaap:LongTermDebtNoncurrent
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:DebtCurrent	us-gaap:DebtCurrent
Notes and debentures
Debt Instrument [Line Items]
Debt instrument, fair value	$ 6,700	$ 8,400
Notes and debentures \| Unsecured Debt
Debt Instrument [Line Items]
Long-term debt, gross	7,807	8,217
Altus credit facility \| Line of Credit
Debt Instrument [Line Items]
Long-term debt, gross	493	396
Apache credit facility \| Line of Credit
Debt Instrument [Line Items]
Long-term debt, gross	$ 565	$ 0

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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Indicates line item in statement of financial position that includes current finance lease liability.

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Indicates line item in statement of financial position that includes noncurrent finance lease liability.

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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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