v3.26.1
Stockholders' Equity - Additional Information (Details)
$ / shares in Units, $ in Millions
 3 Months Ended
Jul. 02, 2021
shares
Mar. 31, 2026
USD ($)
Vote
series
$ / shares
shares
Feb. 19, 2026
$ / shares
Dec. 31, 2025
$ / shares
shares
Mar. 31, 2025
shares
Dec. 31, 2024
shares
Class Of Stock [Line Items]            
Preferred stock, shares authorized (in shares)   1,000,000   1,000,000.0    
Preferred stock, par value (in dollars per share) | $ / shares   $ 0.0001   $ 0.0001    
Preferred stock, shares issued (in shares)   0   0    
Preferred stock, shares outstanding (in shares)   0   0    
Conversion ratio   1        
Remaining authorized amount for future share repurchase program | $   $ 216        
Class A Common Stock            
Class Of Stock [Line Items]            
Common stock, shares outstanding (in shares)   526,775,729   523,900,000    
Common shares, votes per share | Vote   1        
Common stock, shares issued (in shares)   569,400,000   566,500,000    
Common stock, shares authorized (in shares)   1,000,000,000   1,000,000,000    
Common stock, par value (in dollars per share) | $ / shares   $ 0.0001 $ 0.0001 $ 0.0001    
Shares repurchases (in shares)   0        
Class B Common Stock            
Class Of Stock [Line Items]            
Common stock, shares outstanding (in shares)   9,900,000   9,900,000    
Issuance of common units (in shares) 14,999,998          
Number of common stock instruments | series   2        
Common stock, shares issued (in shares)   9,900,000   9,900,000    
Common stock, shares authorized (in shares)   20,000,000.0   20,000,000.0    
Common stock, par value (in dollars per share) | $ / shares   $ 0.0001   $ 0.0001    
Class B-1 Common Stock            
Class Of Stock [Line Items]            
Common stock, shares outstanding (in shares)   4,955,297        
Common stock, shares issued (in shares)   4,955,297        
Common stock shares conversion ratio   1        
Common stock shares convertible stock price trigger (in dollars per share) | $ / shares   $ 12.50        
Common stock shares convertible threshold trading days   20 days        
Common stock shares convertible threshold consecutive trading days   30 days        
Common stock shares convertible stock valuation price on diluted basis (in dollars per share) | $ / shares   $ 12.50        
Class B-1 Common Units | Alight Holdings            
Class Of Stock [Line Items]            
Common stock, shares outstanding (in shares)   2,544,702        
Common stock, shares issued (in shares)   2,544,702        
Common stock shares conversion ratio   1        
Common stock shares convertible stock price trigger (in dollars per share) | $ / shares   $ 12.50        
Common stock shares convertible threshold trading days   20 days        
Common stock shares convertible threshold consecutive trading days   30 days        
Common stock shares convertible stock valuation price on diluted basis (in dollars per share) | $ / shares   $ 12.50        
Class B-2 Common Stock            
Class Of Stock [Line Items]            
Common stock, shares outstanding (in shares)   4,955,297        
Common stock, shares issued (in shares)   4,955,297        
Common stock shares conversion ratio   1        
Common stock shares convertible stock price trigger (in dollars per share) | $ / shares   $ 15.00        
Common stock shares convertible threshold trading days   20 days        
Common stock shares convertible threshold consecutive trading days   30 days        
Common stock shares convertible stock valuation price on diluted basis (in dollars per share) | $ / shares   $ 15.00        
Class B-2 Common Units | Alight Holdings            
Class Of Stock [Line Items]            
Common stock, shares outstanding (in shares)   2,544,702        
Common stock, shares issued (in shares)   2,544,702        
Common stock shares conversion ratio   1        
Common stock shares convertible stock price trigger (in dollars per share) | $ / shares   $ 15.00        
Common stock shares convertible threshold trading days   20 days        
Common stock shares convertible threshold consecutive trading days   30 days        
Common stock shares convertible stock valuation price on diluted basis (in dollars per share) | $ / shares   $ 15.00        
Class B-3 Common Stock            
Class Of Stock [Line Items]            
Common stock, shares outstanding (in shares)   0        
Common stock, shares issued (in shares)   0        
Common stock, shares authorized (in shares)   10,000,000        
Common stock, par value (in dollars per share) | $ / shares   $ 0.0001        
Class V Common Stock            
Class Of Stock [Line Items]            
Common stock, shares outstanding (in shares)   484,358   484,358 510,115 510,237
Common shares, votes per share | Vote   1        
Common stock, shares issued (in shares)   500,000   500,000    
Common stock shares conversion ratio   1        
Common stock, shares authorized (in shares)   175,000,000.0   175,000,000.0    
Common stock, par value (in dollars per share) | $ / shares   $ 0.0001   $ 0.0001    
Shares issued (in shares)   484,358        
Class Z Common Units            
Class Of Stock [Line Items]            
Common stock, shares outstanding (in shares)   0        
Class A Units            
Class Of Stock [Line Items]            
Common stock, shares outstanding (in shares)   527,260,087        
Held by non controlling interest (in shares)   484,358