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Restructuring - Summary of Restructuring Costs (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Restructuring Cost And Reserve [Line Items]    
Restructuring Costs $ 4 $ 15
Total Cost 140  
Employer Solutions    
Restructuring Cost And Reserve [Line Items]    
Restructuring Costs 2 13
Total Cost 89  
Employer Solutions | Severance and Related Benefits    
Restructuring Cost And Reserve [Line Items]    
Restructuring Costs 1 2
Total Cost 10  
Employer Solutions | Other Restructuring Costs    
Restructuring Cost And Reserve [Line Items]    
Restructuring Costs 1 11
Total Cost 79  
Corporate    
Restructuring Cost And Reserve [Line Items]    
Restructuring Costs 2 2
Total Cost 51  
Corporate | Severance and Related Benefits    
Restructuring Cost And Reserve [Line Items]    
Restructuring Costs 1 2
Total Cost 35  
Corporate | Other Restructuring Costs    
Restructuring Cost And Reserve [Line Items]    
Restructuring Costs 1 $ 0
Total Cost $ 16