Condensed Consolidated Statements of Operations (unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Income Statement [Abstract]
Revenue	$ 2	$ 1	$ 3	$ 1
Cost of revenue	7	5	13	5
Research and development	211	190	406	372
Selling, general and administrative	50	36	94	65
Loss from operations	(266)	(230)	(510)	(441)
Other income (expense):
Change in fair value of derivative liabilities	(16)	16	(17)	7
Other income, net	12	13	34	25
Loss before income taxes	(270)	(201)	(493)	(409)
Income tax expense	0	0	0	0
Net loss	$ (270)	$ (201)	$ (493)	$ (409)
Basic net loss per share (in usd per share)	$ (0.14)	$ (0.11)	$ (0.25)	$ (0.23)
Diluted net loss per share (in usd per share)	$ (0.14)	$ (0.11)	$ (0.25)	$ (0.23)
Basic weighted-average shares outstanding (in shares)	1,976	1,785	1,962	1,764
Diluted weighted-average shares outstanding (in shares)	1,976	1,785	1,962	1,764

The aggregate cost of goods produced and sold and services rendered during the reporting period.

Name:	us-gaap_CostOfRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482881/825-10-55-10