EQUITY (Details) - USD ($) $ / shares in Units, $ in Millions		6 Months Ended
	Oct. 27, 2020	Sep. 30, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Additional shares issued under plan (in shares)		0
Common stock, par value (in dollars per share)		$ 0.01	$ 0.01
Outstanding common stock (in percent)		1.00%
Subsequent Event
Schedule of Equity Method Investments [Line Items]
New common stock issued (in shares)	83,300,000
Common stock, par value (in dollars per share)	$ 0.01
Shares reserved for future issuance (in shares)	4,400,000
Expected term (in years)	4 years
Subsequent Event | Ares JV
Schedule of Equity Method Investments [Line Items]
New common stock issued (in shares)	17,300,000
Subsequent Event | Pre-Petition Creditor Group
Schedule of Equity Method Investments [Line Items]
New common stock issued (in shares)	27,100,000
Subsequent Event | Junior DIP Facility
Schedule of Equity Method Investments [Line Items]
New common stock issued (in shares)	821,000
Subscription Rights | Subsequent Event
Schedule of Equity Method Investments [Line Items]
New common stock issued (in shares)	34,600,000
Proceeds from common stock issued	$ 446
Payments for issuance fee	$ 4
Subscription Rights, Backstop Parties | Subsequent Event
Schedule of Equity Method Investments [Line Items]
New common stock issued (in shares)	1,600,000
Subscription Rights, Excluding Backstop Parties | Subsequent Event
Schedule of Equity Method Investments [Line Items]
New common stock issued (in shares)	33,000,000
Subscription Right, Backstop Commitment Agreement | Subsequent Event
Schedule of Equity Method Investments [Line Items]
New common stock issued (in shares)	3,500,000
Tier 1 Warrants | Subsequent Event
Schedule of Equity Method Investments [Line Items]
Warrants exercisable (in percent)	2.00%
Tier 2 Warrants | Subsequent Event
Schedule of Equity Method Investments [Line Items]
Warrants exercisable (in percent)	3.00%
Outstanding common stock (in percent)	3.00%
Investment warrants, exercise price (in dollars per share)	$ 36