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Other Balance Sheet Information (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Cash and Cash Equivalents [Line Items]        
Overnight Holdings $ 386 $ 931    
Short-term Investments 70 133    
Cash 22 27    
Drafts Payable (22) (36)    
Cash, Cash Equivalents, and Short-term Investments 456 1,055    
Payroll Withholdings Included in Cash Balance 316 830    
Client Prepayments Included in Cash Balance (26) (91)    
Cash and cash equivalents 441 1,039 $ 676 $ 693
Restricted cash 76 69 64 57
Funds Held for Clients 42 58 38 87
Deposits workers compensation 174 178 170 198
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Total 733 1,344 948 1,035
ERCFundsReceivedIncludedInCashBalance   440    
Supplemental cash flow information:        
Restricted cash 76 69 64 57
Funds Held for Clients 42 58 38 87
Deposits workers compensation 174 178 170 198
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Total 733 1,344 $ 948 $ 1,035
Money Market Funds [Member]        
Cash and Cash Equivalents [Line Items]        
Overnight Holdings 0 0    
Short-term Investments 15 16    
Cash 0 0    
Drafts Payable 0 0    
Cash, Cash Equivalents, and Short-term Investments 15 16    
Cash and Cash Equivalents [Member]        
Cash and Cash Equivalents [Line Items]        
Overnight Holdings 386 931    
Short-term Investments 55 117    
Cash 22 27    
Drafts Payable (22) (36)    
Cash, Cash Equivalents, and Short-term Investments $ 441 $ 1,039