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Equity Incentive Plans (Tables)

6 Months Ended

Jun. 30, 2025

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,
						2025						2024						2025						2024
Research and development						$	44					$	32					$	73					$	63
Selling, general, and administrative						11						6						16						11
Total						$	55					$	38					$	89					$	74

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, 2024						76						$	2.67
Granted						51						7.44
Vested						(30)						4.24
Forfeited						(6)						3.18
Unvested at June 30, 2025						91						$	4.80

Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions

Stock options granted under the Plan during the six months ended June 30, 2025 were as follows:

						Six Months Ended June 30, 2025
Stock options granted (in millions)						2
Weighted average grant date fair value						$	6.48
Weighted average grant date fair value assumptions:
Expected term						6.2 years
Risk-free interest rates						4.3		%
Expected volatility						88.8		%

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, 2024			117						$	2.07
Granted			2						8.47
Exercised			(13)						2.08
Forfeited			(4)						2.05
Outstanding at June 30, 2025			102						$	2.19					7.1						$	310
Exercisable at June 30, 2025			61						$	1.81					6.2						$	204

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Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit.

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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