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CHAPTER 11 PROCEEDINGS - Emergence (Details) $ / shares in Units, shares in Thousands, $ in Millions			1 Months Ended
	Oct. 31, 2020 USD ($) shares	Oct. 27, 2020 USD ($) director $ / shares shares	Jan. 31, 2021 shares	Dec. 31, 2020 shares	Jul. 15, 2020 shares
Debt Instrument [Line Items]
New common stock issued (in shares)	83,300	83,300		83,300
Shares reserved for future issuance (in shares)		4,400		9,300
Shares reserved for issuance of incentive plan		9,300
Warrants exercisable		5.00%
Initial exercise price (in dollars per share) | $ / shares		$ 36
Number of existing directors remained | director		1
Number of new directors | director		7
Restricted Stock Units (RSUs) | Subsequent Event | Non-Employee Directors
Debt Instrument [Line Items]
Granted (in shares)			258
Restricted Stock Units (RSUs) | Subsequent Event | Executive Officer
Debt Instrument [Line Items]
Granted (in shares)			544
Performance Stock Units | Subsequent Event
Debt Instrument [Line Items]
Granted (in shares)			544
Subscription Rights
Debt Instrument [Line Items]
New common stock issued (in shares)		34,600
Exchange of issuance of common stock | $		$ 446
Payments for issuance costs net of fee | $		$ 4
Subscription Right, Backstop Commitment Agreement
Debt Instrument [Line Items]
New common stock issued (in shares)		3,500
Tier 1 Warrants
Debt Instrument [Line Items]
Warrants exercisable		2.00%
Tier 2 Warrants
Debt Instrument [Line Items]
Warrants exercisable		3.00%
2017 Credit Agreement
Debt Instrument [Line Items]
New common stock issued (in shares)		22,700
2016 Credit Agreement, Second Lien Notes, 2021 Notes And 2024 Notes
Debt Instrument [Line Items]
New common stock issued (in shares)		4,400
EHP Notes
Debt Instrument [Line Items]
Cash acquired | $	$ 2	$ 2
Junior DIP Facility
Debt Instrument [Line Items]
New common stock issued (in shares)		821
Backstop Commitment Agreement | Subscription Right, Backstop Commitment Agreement
Debt Instrument [Line Items]
New common stock issued (in shares)					3,500
Ares JV
Debt Instrument [Line Items]
New common stock issued (in shares)		17,300

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