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Other Balance Sheet Information (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Dec. 31, 2023
Cash and Cash Equivalents [Line Items]        
Overnight Holdings $ 335 $ 931    
Short-term Investments 99 133    
Cash 23 27    
Drafts Payable (17) (36)    
Cash, Cash Equivalents, and Short-term Investments 440 1,055    
Payroll Withholdings Included in Cash Balance 284 830    
Client Prepayments Included in Cash Balance (36) (91)    
Cash and cash equivalents 422 1,039 $ 470 $ 693
Restricted cash 79 69 67 57
Funds Held for Clients 40 58 36 87
Deposits workers compensation 147 178 175 198
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Total 688 1,344 748 1,035
ERCFundsReceivedIncludedInCashBalance   440    
Supplemental cash flow information:        
Restricted cash 79 69 67 57
Funds Held for Clients 40 58 36 87
Deposits workers compensation 147 178 175 198
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Total 688 1,344 $ 748 $ 1,035
Money Market Funds [Member]        
Cash and Cash Equivalents [Line Items]        
Overnight Holdings 0 0    
Short-term Investments 18 16    
Cash 0 0    
Drafts Payable 0 0    
Cash, Cash Equivalents, and Short-term Investments 18 16    
Cash and Cash Equivalents [Member]        
Cash and Cash Equivalents [Line Items]        
Overnight Holdings 335 931    
Short-term Investments 81 117    
Cash 23 27    
Drafts Payable (17) (36)    
Cash, Cash Equivalents, and Short-term Investments $ 422 $ 1,039