CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY - USD ($) $ in Millions	Total	Common Stock	Common Stock Restricted Shares	Common Stock RSUs	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Dec. 31, 2020		540,714,692
Beginning balance at Dec. 31, 2020	$ 1,553	$ 0			$ 2,596	$ (1,043)	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in connection with the February 2021 Offering (in shares)		32,817,421
Issuance of common stock in connection with the February 2021 Offering	857				857
Vesting of restricted stock and restricted stock units (in shares)		979,198		17,712,282
Common stock issued upon exercise of warrants (in shares)		8,200,151
Common stock issued upon exercise of warrants	58				58
Exercise of stock options (in shares)		6,791,489
Exercise of stock options	11				11
Purchases of Capped Calls related to the 2026 Notes	(119)				(119)
Stock-based compensation	474				474
Net loss	(471)					(471)
Ending balance (in shares) at Sep. 30, 2021		607,215,233
Ending balance at Sep. 30, 2021	2,363	$ 0			3,877	(1,514)	0
Beginning balance (in shares) at Jun. 30, 2021		593,838,919
Beginning balance at Jun. 30, 2021	2,418	$ 0			3,875	(1,457)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of restricted stock and restricted stock units (in shares)			318,929	2,812,297
Common stock issued upon exercise of warrants (in shares)		7,695,674
Common stock issued upon exercise of warrants	52				52
Exercise of stock options (in shares)		2,549,414
Exercise of stock options	4				4
Purchases of Capped Calls related to the 2026 Notes	(119)				(119)
Stock-based compensation	65				65
Net loss	(57)					(57)
Ending balance (in shares) at Sep. 30, 2021		607,215,233
Ending balance at Sep. 30, 2021	$ 2,363	$ 0			3,877	(1,514)	0
Beginning balance (in shares) at Dec. 31, 2021	616,026,565	616,026,565
Beginning balance at Dec. 31, 2021	$ 2,248	$ 0			3,955	(1,705)	(2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of restricted stock and restricted stock units (in shares)			142,445	12,957,946
Exercise of stock options (in shares)	2,892,000	2,892,389
Exercise of stock options	$ 4				4
Employee stock purchase plan (in shares)		493,790
Employee stock purchase plan	2				2
Stock-based compensation	191				191
Other comprehensive loss	(3)						(3)
Net loss	$ (954)					(954)
Ending balance (in shares) at Sep. 30, 2022	632,513,135	632,513,135
Ending balance at Sep. 30, 2022	$ 1,488	$ 0			4,152	(2,659)	(5)
Beginning balance (in shares) at Jun. 30, 2022		627,033,133
Beginning balance at Jun. 30, 2022	2,356	$ 0			4,092	(1,731)	(5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of restricted stock and restricted stock units (in shares)			316	4,414,922
Exercise of stock options (in shares)		570,974
Exercise of stock options	1				1
Employee stock purchase plan (in shares)		493,790
Employee stock purchase plan	2				2
Stock-based compensation	57				57
Other comprehensive loss	0						0
Net loss	$ (928)					(928)
Ending balance (in shares) at Sep. 30, 2022	632,513,135	632,513,135
Ending balance at Sep. 30, 2022	$ 1,488	$ 0			$ 4,152	$ (2,659)	$ (5)