v3.26.1
PRESENTATION AND NATURE OF OPERATIONS (Details)
$ / shares in Units, shares in Millions, $ in Millions
 1 Months Ended 6 Months Ended
May 31, 2026
USD ($)
$ / shares
shares
Apr. 30, 2026
USD ($)
$ / shares
shares
Nov. 30, 2024
USD ($)
Jun. 30, 2026
USD ($)
milestone
segment
$ / shares
Jun. 30, 2025
USD ($)
Debt Instrument [Line Items]          
Number of reportable segments | segment       2  
Proceeds from issuance of capital stock       $ 1,300 $ 750
Loan Agreements | Term Loan          
Debt Instrument [Line Items]          
Aggregate principal amount     $ 1,000    
Annual principal payment     100    
Biannual installments     $ 50    
Volkswagen Group | Testing Milestone Payments | Principal Owner          
Debt Instrument [Line Items]          
Proceeds from issuance of capital stock   $ 1,000      
Volkswagen Group | Testing Milestone Payments | Common Class A | Principal Owner          
Debt Instrument [Line Items]          
Number of shares issued in transaction (in shares) | shares   63      
Price per share (in dollars per share) | $ / shares   $ 15.90      
Volkswagen Group | Start of Production Milestone Payments          
Debt Instrument [Line Items]          
Receivable, contingent on milestone achievement       460  
Volkswagen Group | Start of Production Milestone Payments | Common Class A          
Debt Instrument [Line Items]          
Capital shares reserved for future issuance       250  
SMB Holding Corporation and Uber Technologies, Inc. | Uber Subscription Agreement          
Debt Instrument [Line Items]          
Proceeds from issuance of capital stock $ 300        
Number of shares issued in transaction (in shares) | shares 20        
Maximum aggregate milestone payments       $ 950  
Remaining milestone payments, number | milestone       4  
Exercise price (in USD per share) | $ / shares       $ 0.001  
SMB Holding Corporation and Uber Technologies, Inc. | Uber Subscription Agreement | Common Class A          
Debt Instrument [Line Items]          
Price per share (in dollars per share) | $ / shares $ 15.34