Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Equity Award Programs	Common Stock	Common Stock Equity Award Programs	Common stock and additional paid-in capital	Common stock and additional paid-in capital Equity Award Programs	Accumulated deficit	Accumulated other comprehensive loss
Beginning balance, shares at Dec. 31, 2022			72.9
Beginning balance at Dec. 31, 2022	$ 657				$ 1,206		$ (542)	$ (7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (in shares)				0.2
Issuance of common stock		$ 1				$ 1
Stock-based compensation	19				19
Other comprehensive income (loss)	3							3
Net loss	(80)						(80)
Ending balance, shares at Mar. 31, 2023			73.1
Ending balance at Mar. 31, 2023	600				1,226		(622)	(4)
Beginning balance, shares at Dec. 31, 2022			72.9
Beginning balance at Dec. 31, 2022	657				1,206		(542)	(7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(155)
Ending balance, shares at Jun. 30, 2023			74.5
Ending balance at Jun. 30, 2023	566				1,267		(697)	(4)
Beginning balance, shares at Mar. 31, 2023			73.1
Beginning balance at Mar. 31, 2023	600				1,226		(622)	(4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (in shares)			1.0	0.4
Issuance of common stock	20	3			20	3
Stock-based compensation	18				18
Net loss	(75)						(75)
Ending balance, shares at Jun. 30, 2023			74.5
Ending balance at Jun. 30, 2023	$ 566				1,267		(697)	(4)
Beginning balance, shares at Dec. 31, 2023	75.5		75.5
Beginning balance at Dec. 31, 2023	$ 462				1,311		(849)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (in shares)			15.2	0.2
Issuance of common stock	228	2			228	2
Stock-based compensation	20				20
Other comprehensive income (loss)	(1)							(1)
Net loss	(4)						(4)
Ending balance, shares at Mar. 31, 2024			90.9
Ending balance at Mar. 31, 2024	$ 707				1,561		(853)	(1)
Beginning balance, shares at Dec. 31, 2023	75.5		75.5
Beginning balance at Dec. 31, 2023	$ 462				1,311		(849)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ (97)
Ending balance, shares at Jun. 30, 2024	91.3		91.3
Ending balance at Jun. 30, 2024	$ 635				1,582		(946)	(1)
Beginning balance, shares at Mar. 31, 2024			90.9
Beginning balance at Mar. 31, 2024	707				1,561		(853)	(1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (in shares)				0.4
Issuance of common stock		$ 1				$ 1
Stock-based compensation	20				20
Net loss	$ (93)						(93)
Ending balance, shares at Jun. 30, 2024	91.3		91.3
Ending balance at Jun. 30, 2024	$ 635				$ 1,582		$ (946)	$ (1)