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BASIS OF PRESENTATION (Details) - USD ($)		1 Months Ended	3 Months Ended
	May 18, 2020	Dec. 31, 2014	Mar. 31, 2020	Jun. 15, 2020	Jun. 02, 2020	May 31, 2020	May 29, 2020	May 15, 2020	Apr. 30, 2020	Feb. 20, 2020	Dec. 31, 2019	May 31, 2015
Debt instrument
Available liquidity			$ 395,000,000
Unrestricted cash			67,000,000
Dividends paid		$ 6,000,000,000
Line of credit facility, maximum borrowing capacity			1,000,000,000
Debt carrying value			$ 4,860,000,000								$ 4,977,000,000	$ 6,800,000,000
Grace period			30 days
2014 Revolving Credit Facility
Debt instrument
Available borrowing capacity before a month-end minimum liquidity requirement			$ 328,000,000
Financial covenant minimum month end liquidity			150,000,000
Borrowing base			2,300,000,000
Subsequent Event
Debt instrument
Available liquidity						$ 165,000,000
Unrestricted cash						148,000,000
Line of credit facility, maximum borrowing capacity									$ 900,000,000
Aggregate book cash balance requirement					$ 40,000,000
Subsequent Event | 2014 Revolving Credit Facility
Debt instrument
Available borrowing capacity before a month-end minimum liquidity requirement						$ 17,000,000
Borrowing base	$ 1,200,000,000
Senior Notes (Unsecured)
Debt instrument
Potential reduction in debt										$ 1,000,000,000
Senior Notes (Unsecured) | 5.5% Notes Due 2021
Debt instrument
Debt carrying value			$ 100,000,000								$ 100,000,000
Debt instrument, interest rate, stated percentage			5.50%							5.50%	5.50%
Senior Notes (Unsecured) | 6% Senior Notes due 2024
Debt instrument
Debt carrying value			$ 144,000,000								$ 144,000,000
Debt instrument, interest rate, stated percentage			6.00%							6.00%	6.00%
Senior Notes (Unsecured) | 6% Senior Notes due 2024 | Subsequent Event
Debt instrument
Interest not paid								$ 4,300,000
Shared First Priority Lien | Subsequent Event
Debt instrument
Interest not paid							$ 51,000,000
2017 Credit Agreement (Shared First Priority Lien)
Debt instrument
Debt carrying value			$ 1,300,000,000								$ 1,300,000,000
2016 Credit Agreement (Shared First Priority Lien)
Debt instrument
Debt carrying value			1,000,000,000								1,000,000,000
Second Lien Notes (Second Priority Lien)
Debt instrument
Debt carrying value			$ 1,809,000,000								$ 1,815,000,000
Debt instrument, interest rate, stated percentage			8.00%								8.00%
Second Lien Notes (Second Priority Lien) | Subsequent Event
Debt instrument
Interest not paid				$ 72,300,000

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Available Liquidity

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The amount of money that maybe borrowed based on the value of the collateral the entity pledges.

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Debt Instrument, Aggregate Book Cash Balance Requirement For More Than Three Consecutive Business Days

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Amount of minimum monthly liquidity required to maintain, per debt covenant agreement.

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Debt Instrument, Grace Period

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Debt Instrument, Interest Not Paid

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Potential Reduction in Debt

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Unrestricted Cash

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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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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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