CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Millions		Total		Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Common Stock in Treasury
Balance (in shares) at Dec. 31, 2020				718,795,700				44,353,224
Balance beginning at Dec. 31, 2020		$ 497		$ 7	$ 5,093	$ (4,363)	$ (38)	$ (202)
Comprehensive income (loss):
Net income (loss)		80				80
Comprehensive income (loss)		80
Issuance of restricted stock (in shares)				10,067
Cancellation of restricted stock (in shares)				(405)
Restricted units vested (in shares)				2,136,882
Restricted units vested		8			8
Performance units vested (in shares)				1,001,505
Performance units vested		4			4
Tax withholding - stock compensation (in shares)				(748,627)
Tax withholding – stock compensation		(3)			(3)
Balance (in shares) at Mar. 31, 2021				721,195,122				44,353,224
Balance ending at Mar. 31, 2021		586		$ 7	5,102	(4,283)	(38)	$ (202)
Balance (in shares) at Dec. 31, 2020				718,795,700				44,353,224
Balance beginning at Dec. 31, 2020		497		$ 7	5,093	(4,363)	(38)	$ (202)
Comprehensive income (loss):
Net income (loss)		(529)
Other comprehensive income	[1]	3
Comprehensive income (loss)		(526)
Balance (in shares) at Jun. 30, 2021				721,372,443				44,353,224
Balance ending at Jun. 30, 2021		(18)		$ 7	5,104	(4,892)	(35)	$ (202)
Balance (in shares) at Dec. 31, 2020				718,795,700				44,353,224
Balance beginning at Dec. 31, 2020		497		$ 7	5,093	(4,363)	(38)	$ (202)
Balance (in shares) at Dec. 31, 2021				1,158,672,666				44,353,224
Balance ending at Dec. 31, 2021		2,547		$ 12	7,150	(4,388)	(25)	$ (202)
Balance (in shares) at Mar. 31, 2021				721,195,122				44,353,224
Balance beginning at Mar. 31, 2021		586		$ 7	5,102	(4,283)	(38)	$ (202)
Comprehensive income (loss):
Net income (loss)		(609)				(609)
Other comprehensive income		3	[1]				3
Comprehensive income (loss)		(606)
Stock-based compensation		2			2
Issuance of restricted stock (in shares)				148,700
Restricted units vested (in shares)				41,879
Restricted units vested		0			0
Tax withholding - stock compensation (in shares)				(13,258)
Tax withholding – stock compensation		0			0
Balance (in shares) at Jun. 30, 2021				721,372,443				44,353,224
Balance ending at Jun. 30, 2021		(18)		$ 7	5,104	(4,892)	(35)	$ (202)
Balance (in shares) at Dec. 31, 2021				1,158,672,666				44,353,224
Balance beginning at Dec. 31, 2021		2,547		$ 12	7,150	(4,388)	(25)	$ (202)
Comprehensive income (loss):
Net income (loss)		(2,675)				(2,675)
Comprehensive income (loss)		(2,675)
Stock-based compensation		1			1
Performance units vested (in shares)				2,499,860
Performance units vested		12			12
Tax withholding - stock compensation (in shares)				(721,070)
Tax withholding – stock compensation		(4)			(4)
Balance (in shares) at Mar. 31, 2022				1,160,451,456				44,353,224
Balance ending at Mar. 31, 2022		(119)		$ 12	7,159	(7,063)	(25)	$ (202)
Balance (in shares) at Dec. 31, 2021				1,158,672,666				44,353,224
Balance beginning at Dec. 31, 2021		2,547		$ 12	7,150	(4,388)	(25)	$ (202)
Comprehensive income (loss):
Net income (loss)		(1,502)
Other comprehensive income		0	[1]				0
Comprehensive income (loss)		(1,502)
Balance (in shares) at Jun. 30, 2022				1,161,475,422				47,168,765
Balance ending at Jun. 30, 2022		1,043		$ 12	7,168	(5,890)	(25)	$ (222)
Balance (in shares) at Mar. 31, 2022				1,160,451,456				44,353,224
Balance beginning at Mar. 31, 2022		(119)		$ 12	7,159	(7,063)	(25)	$ (202)
Comprehensive income (loss):
Net income (loss)		1,173				1,173
Other comprehensive income		0	[1]				0
Comprehensive income (loss)		1,173
Stock-based compensation		2			2
Exercise of stock options (in shares)				893,312
Exercise of stock options		7			7
Issuance of restricted stock (in shares)				115,608
Restricted units vested (in shares)				21,981
Treasury stock (in shares)								2,815,541
Treasury stock		$ (20)						$ (20)
Issuance of stock awards (in shares)		79
Tax withholding - stock compensation (in shares)				(7,014)
Balance (in shares) at Jun. 30, 2022				1,161,475,422				47,168,765
Balance ending at Jun. 30, 2022		$ 1,043		$ 12	$ 7,168	$ (5,890)	$ (25)	$ (222)

[1] Settlement adjustment was less than $1 million for the three and six months ended June 30, 2022. Settlement adjustment reflects $1 million in tax benefits for the three and six months ended June 30, 2021.