DEBT AND FINANCING COSTS - Schedule of Debt (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Finance lease obligations	$ 39	$ 48
Unamortized discount	(42)	(42)
Debt issuance costs	(52)	(53)
Total debt	8,880	8,566
Current maturities	(544)	(11)
Long-term debt	8,336	8,555
Notes and debentures
Debt Instrument [Line Items]
Debt instrument, fair value	4,300	8,400
Notes and debentures \| Unsecured Debt
Debt Instrument [Line Items]
Long-term debt, gross	8,217	8,217
Altus credit facility \| Line of Credit
Debt Instrument [Line Items]
Long-term debt, gross	468	396
Apache credit facility \| Line of Credit
Debt Instrument [Line Items]
Long-term debt, gross	$ 250	$ 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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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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