v3.26.3
Other Balance Sheet Information (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Sep. 30, 2025
Dec. 31, 2024
Cash and Cash Equivalents [Line Items]        
Overnight Holdings $ 518 $ 638    
Short-term Investments 79 40    
Cash 25 22    
Drafts Payable (23) (40)    
Cash, Cash Equivalents, and Short-term Investments 599 660    
Payroll Withholdings Included in Cash Balance 426 468    
Client Prepayments Included in Cash Balance (54) (135)    
Cash and cash equivalents 599 642 $ 422 $ 1,039
Restricted cash 84 82 79 69
Funds Held for Clients 44 73 40 58
Deposits workers compensation 132 148 147 178
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Total 859 945 688 1,344
Supplemental cash flow information:        
Restricted cash 84 82 79 69
Funds Held for Clients 44 73 40 58
Deposits workers compensation 132 148 147 178
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Total 859 945 $ 688 $ 1,344
Money Market Funds [Member]        
Cash and Cash Equivalents [Line Items]        
Overnight Holdings 0 0    
Short-term Investments 0 18    
Cash 0 0    
Drafts Payable 0 0    
Cash, Cash Equivalents, and Short-term Investments 0 18    
Cash and Cash Equivalents [Member]        
Cash and Cash Equivalents [Line Items]        
Overnight Holdings 518 638    
Short-term Investments 79 22    
Cash 25 22    
Drafts Payable (23) (40)    
Cash, Cash Equivalents, and Short-term Investments $ 599 $ 642