v3.26.1
Warrants - Stellantis N.V. (Details)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Apr. 27, 2026
shares
Jan. 03, 2023
USD ($)
tranche
$ / shares
shares
Jun. 30, 2026
USD ($)
$ / shares
shares
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
$ / shares
shares
Jun. 30, 2025
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Warrants price per share (in dollars per share)     $ 0.01   $ 0.01  
Research and development | $     $ 186.0 $ 122.4 $ 357.7 $ 226.1
Stellantis N.V.            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Warrants price per share (in dollars per share)   $ 0.01        
Warrants, weighted average grant date fair value (in dollars per share)   $ 1.93        
Stellantis N.V. | Warrant Exercisable Period One            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Founder grants, number of tranches | tranche   3        
Award vesting period (in years)   12 months        
Stellantis N.V. | Warrant Exercisable Period Two            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period (in years)   24 months        
Stellantis N.V. | Warrant Exercisable Period Three            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period (in years)   36 months        
Stellantis N.V. | Warrants For Collaboration Agreement With FCA US LLC            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Research and development | $       $ 0.8 $ 0.1 $ 1.6
Stellantis N.V. | Class A            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Sale of stock value | $   $ 150.0        
Number of securities called by warrants or rights (in shares) | shares   15,000,000.0        
Stock price (in dollars per share)   $ 1.93        
FCA US LLC | Warrants For Collaboration Agreement With FCA US LLC            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of securities called by warrants or rights (in shares) | shares     1,671,202   1,671,202  
Warrants price per share (in dollars per share)     $ 0.01   $ 0.01  
Conversion of stock (in shares) | shares 1,669,783