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DEBT AND FINANCING COSTS - Schedule of Debt (Details) - USD ($)	Dec. 31, 2019	Jul. 01, 2019	Jun. 19, 2019	Dec. 31, 2018	Aug. 31, 2018
Debt Instrument [Line Items]
Long-term debt, gross	$ 8,217,000,000			$ 8,299,000,000
Altus credit facility	0			0
Finance lease obligations	48,000,000
Finance lease obligations				40,000,000
Unamortized discount	(42,000,000)			(44,000,000)
Debt issuance costs	(53,000,000)			(51,000,000)
Total debt	8,566,000,000			8,244,000,000
Current maturities	11,000,000			151,000,000
Long-term debt	8,555,000,000			8,093,000,000
Notes and debentures
Debt Instrument [Line Items]
Debt fair value	8,400,000,000			7,800,000,000
Altus credit facility
Debt Instrument [Line Items]
Altus credit facility	396,000,000			0
Unsecured Debt
Debt Instrument [Line Items]
Debt principal amount			$ 1,000,000,000.0
Unsecured Debt \| 7.625% notes due 2019
Debt Instrument [Line Items]
Long-term debt, gross	$ 0			150,000,000
Debt interest rate	7.625%
Unsecured Debt \| 3.625% notes due 2021
Debt Instrument [Line Items]
Long-term debt, gross	$ 293,000,000			393,000,000
Debt interest rate	3.625%
Unsecured Debt \| 3.25% notes due 2022
Debt Instrument [Line Items]
Long-term debt, gross	$ 463,000,000			687,000,000
Debt interest rate	3.25%
Unsecured Debt \| 2.625% notes due 2023
Debt Instrument [Line Items]
Long-term debt, gross	$ 181,000,000			403,000,000
Debt interest rate	2.625%
Unsecured Debt \| 7.7% notes due 2026
Debt Instrument [Line Items]
Long-term debt, gross	$ 79,000,000			79,000,000
Debt interest rate	7.70%
Unsecured Debt \| 7.95% notes due 2026
Debt Instrument [Line Items]
Long-term debt, gross	$ 133,000,000			133,000,000
Debt interest rate	7.95%
Unsecured Debt \| 4.375% notes due 2028
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,000,000,000			1,000,000,000
Debt interest rate	4.375%				4.375%
Unsecured Debt \| 7.75% notes due in 2029
Debt Instrument [Line Items]
Long-term debt, gross	$ 247,000,000			300,000,000
Debt interest rate	7.75%
Unsecured Debt \| 4.25% notes due 2030
Debt Instrument [Line Items]
Long-term debt, gross	$ 600,000,000			0
Debt interest rate	4.25%
Unsecured Debt \| 6.0% notes due 2037
Debt Instrument [Line Items]
Long-term debt, gross	$ 467,000,000			800,000,000
Debt interest rate	6.00%
Unsecured Debt \| 5.1% notes due 2040
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,499,000,000			1,499,000,000
Debt interest rate	5.10%
Unsecured Debt \| 5.25% notes due 2042
Debt Instrument [Line Items]
Long-term debt, gross	$ 500,000,000			500,000,000
Debt interest rate	5.25%
Unsecured Debt \| 4.75% notes due 2043
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,413,000,000			1,413,000,000
Debt interest rate	4.75%
Unsecured Debt \| 4.25% notes due 2044
Debt Instrument [Line Items]
Long-term debt, gross	$ 753,000,000			753,000,000
Debt interest rate	4.25%
Unsecured Debt \| 7.375% debentures due 2047
Debt Instrument [Line Items]
Long-term debt, gross	$ 150,000,000			150,000,000
Debt interest rate	7.375%
Unsecured Debt \| 5.35% notes due 2049
Debt Instrument [Line Items]
Long-term debt, gross	$ 400,000,000			0
Debt interest rate	5.35%
Unsecured Debt \| 7.625% debentures due 2096
Debt Instrument [Line Items]
Long-term debt, gross	$ 39,000,000			39,000,000
Debt interest rate	7.625%	7.625%
Senior Notes \| 7.625% debentures due 2096
Debt Instrument [Line Items]
Debt principal amount		$ 150,000,000
Commercial paper
Debt Instrument [Line Items]
Long-term debt, gross	$ 0			$ 0