v3.26.1
Other Balance Sheet Information (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Dec. 31, 2024
Cash and Cash Equivalents [Line Items]        
Overnight Holdings $ 591 $ 638    
Short-term Investments 36 40    
Cash 9 22    
Drafts Payable (17) (40)    
Cash, Cash Equivalents, and Short-term Investments 619 660    
Payroll Withholdings Included in Cash Balance 481 468    
Client Prepayments Included in Cash Balance (43) (135)    
Cash and cash equivalents 619 642 $ 441 $ 1,039
Restricted cash 81 82 76 69
Funds Held for Clients 50 73 42 58
Deposits workers compensation 160 148 174 178
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Total 910 945 733 1,344
Supplemental cash flow information:        
Restricted cash 81 82 76 69
Funds Held for Clients 50 73 42 58
Deposits workers compensation 160 148 174 178
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Total 910 945 $ 733 $ 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 591 638    
Short-term Investments 36 22    
Cash 9 22    
Drafts Payable (17) (40)    
Cash, Cash Equivalents, and Short-term Investments $ 619 $ 642