v3.26.1
Stockholders' Equity - Additional Information (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 10, 2026
shares
Jul. 02, 2021
shares
Jun. 30, 2026
USD ($)
Vote
series
$ / shares
shares
Jun. 30, 2026
USD ($)
Vote
series
$ / shares
shares
Jun. 11, 2026
shares
Mar. 31, 2026
shares
Feb. 19, 2026
$ / shares
Dec. 31, 2025
$ / shares
shares
Jun. 30, 2025
shares
Mar. 31, 2025
shares
Dec. 31, 2024
shares
Class Of Stock [Line Items]                      
Reverse stock split 0.05                    
Preferred stock, shares authorized (in shares)     1,000,000 1,000,000       1,000,000.0      
Preferred stock, par value (in dollars per share) | $ / shares     $ 0.0001 $ 0.0001       $ 0.0001      
Preferred stock, shares issued (in shares)     0 0       0      
Preferred stock, shares outstanding (in shares)     0 0       0      
Conversion ratio     1 1              
Remaining authorized amount for future share repurchase program | $     $ 216 $ 216              
Class A Common Stock                      
Class Of Stock [Line Items]                      
Common stock, shares authorized (in shares) 1,000,000,000   50,000,000.0 50,000,000.0 50,000,000     50,000,000.0      
Common stock, shares outstanding (in shares)     26,399,569 26,399,569       26,200,000      
Common shares, votes per share | Vote     1 1              
Common stock, shares issued (in shares)     28,500,000 28,500,000       28,300,000      
Common stock, par value (in dollars per share) | $ / shares     $ 0.0001 $ 0.0001     $ 0.0001 $ 0.0001      
Shares repurchases (in shares)     0 0              
Class B Common Stock                      
Class Of Stock [Line Items]                      
Common stock, shares authorized (in shares) 30,000,000   1,000,000.0 1,000,000.0 1,500,000     1,000,000.0      
Common stock, shares outstanding (in shares)     500,000 500,000       500,000      
Issuance of common units (in shares)   749,978                  
Number of common stock instruments | series     2 2              
Common stock, shares issued (in shares)     500,000 500,000       500,000      
Common stock, par value (in dollars per share) | $ / shares     $ 0.0001 $ 0.0001       $ 0.0001      
Class B-1 Common Stock                      
Class Of Stock [Line Items]                      
Common stock, shares authorized (in shares)         500,000            
Common stock, shares outstanding (in shares)     247,733 247,733              
Common stock, shares issued (in shares)     247,733 247,733              
Common stock shares conversion ratio       1              
Common stock shares convertible stock price trigger (in dollars per share) | $ / shares       $ 250.00              
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       $ 250.00              
Class B-1 Common Units | Alight Holdings                      
Class Of Stock [Line Items]                      
Common stock, shares outstanding (in shares)     127,256 127,256              
Common stock, shares issued (in shares)     127,256 127,256              
Common stock shares conversion ratio       1              
Common stock shares convertible stock price trigger (in dollars per share) | $ / shares       $ 250.00              
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       $ 250.00              
Class B-2 Common Stock                      
Class Of Stock [Line Items]                      
Common stock, shares authorized (in shares)         500,000            
Common stock, shares outstanding (in shares)     247,733 247,733              
Common stock, shares issued (in shares)     247,733 247,733              
Common stock shares conversion ratio       1              
Common stock shares convertible stock price trigger (in dollars per share) | $ / shares       $ 300.00              
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       $ 300.00              
Class B-2 Common Units | Alight Holdings                      
Class Of Stock [Line Items]                      
Common stock, shares outstanding (in shares)     127,256 127,256              
Common stock, shares issued (in shares)     127,256 127,256              
Common stock shares conversion ratio       1              
Common stock shares convertible stock price trigger (in dollars per share) | $ / shares       $ 300.00              
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       $ 300.00              
Class B-3 Common Stock                      
Class Of Stock [Line Items]                      
Common stock, shares authorized (in shares)     500,000 500,000 500,000            
Common stock, shares outstanding (in shares)     0 0              
Common stock, shares issued (in shares)     0 0              
Common stock, par value (in dollars per share) | $ / shares     $ 0.0001 $ 0.0001              
Class V Common Stock                      
Class Of Stock [Line Items]                      
Common stock, shares authorized (in shares) 175,000,000   8,800,000 8,800,000 8,750,000     8,800,000      
Common stock, shares outstanding (in shares)     24,217 24,217   24,217   24,217 25,505 25,505 25,511
Common shares, votes per share | Vote     1 1              
Common stock, shares issued (in shares)     20,000.00 20,000.00       20,000.00      
Common stock shares conversion ratio       1              
Common stock, par value (in dollars per share) | $ / shares     $ 0.0001 $ 0.0001       $ 0.0001      
Shares issued (in shares)       24,217              
Class Z Common Units                      
Class Of Stock [Line Items]                      
Common stock, shares authorized (in shares) 12,900,000       645,000            
Common stock, shares outstanding (in shares)     0 0              
Common Class Z A                      
Class Of Stock [Line Items]                      
Common stock, shares authorized (in shares)         575,000            
Common Class Z B-1                      
Class Of Stock [Line Items]                      
Common stock, shares authorized (in shares)         35,000            
Common Class Z B-2                      
Class Of Stock [Line Items]                      
Common stock, shares authorized (in shares)         35,000            
Class A Units                      
Class Of Stock [Line Items]                      
Common stock, shares outstanding (in shares)     26,423,786 26,423,786              
Held by non controlling interest (in shares)       24,217