Quarterly report [Sections 13 or 15(d)]

Stock-Based Compensation - Grants of stock options (Details)

v3.26.1
Stock-Based Compensation - Grants of stock options (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Stock-Based Compensation        
Stock-based compensation $ 6 $ 6 $ 11 $ 8
Series C common stock        
Stock-Based Compensation        
Options granted     181  
Series B common stock        
Stock-Based Compensation        
Options granted     0  
Series A common stock        
Stock-Based Compensation        
Options granted     0  
Employee Stock Option        
Stock-Based Compensation        
Dividend rate     0.00%  
Subsidiary employees | Employee Stock Option | Series C common stock        
Stock-Based Compensation        
Options granted     181  
Vesting period     5 years  
Weighted average GDFV     $ 26.4