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Equity Incentive Plans (Tables)
 6 Months Ended
Jun. 30, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of Stock-Based Compensation Expense
Total stock-based compensation expense by function was as follows (in millions):
Three Months Ended
June 30,		Six Months Ended
June 30,
2023202220232022
Research and development
$37 $42 $71 $68 
Selling, general, and administrative
6 5 11 8 
Total
$43 $47 $82 $76 
Schedule of Restricted Stock Unit Activity
RSU activity under the Plan and the 2017 Plan was as follows (in millions, except per share amounts):
Number of
shares		Weighted-
average grant
date fair value
Unvested at December 31, 2022
103 $3.70 
Granted
48 1.43 
Vested(19)3.74 
Forfeited
(9)3.29 
Unvested at June 30, 2023
123 $2.85 
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions Stock options granted under the Plan and the 2017 Plan during the six months ended June 30, 2023 were as follows:
Six Months Ended
June 30, 2023
Stock options granted (in millions)46 
Weighted average grant date fair value$0.79 
Weighted average grant date fair value assumptions:
Expected term
5.8 years
Risk-free interest rates
4.3 %
Expected volatility55.0 %
Schedule of Share-Based Payment Arrangement, Option, Activity
Stock option activity under the Plan and the 2017 Plan was as follows (in millions, except per share amounts):
Number of
shares		Weighted
average
exercise price		Weighted average remaining contractual term (in years)Aggregate intrinsic value
Outstanding at December 31, 2022
63 $1.76 
Granted46 1.44 
Exercised
(3)0.58 
Forfeited
(3)2.29 
Expired
(2)2.79 
Outstanding at June 30, 2023
101 $1.62 7.8$127 
Exercisable at June 30, 2023
46 $1.47 6.0$67