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
Total 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, 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)
Total 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)