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Other Balance Sheet Information (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Dec. 31, 2022
Cash and Cash Equivalents [Line Items]        
Overnight Holdings $ 365 $ 611    
Short-term Investments 126 135    
Cash 11 27    
Drafts Payable (16) (64)    
Cash, Cash Equivalents, and Short-term Investments 486 709    
Payroll Withholdings Included in Cash Balance 255 510    
Client Prepayments Included in Cash Balance (19) (28)    
Cash and cash equivalents 470 693 $ 679 $ 733
Restricted cash 67 57 51 50
Funds Held for Clients 36 87 30 35
Deposits workers compensation 175 198 197 196
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Total 748 1,035 957 1,014
Supplemental cash flow information:        
Restricted cash 67 57 51 50
Funds Held for Clients 36 87 30 35
Deposits workers compensation 175 198 197 196
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Total 748 1,035 $ 957 $ 1,014
Money Market Funds [Member]        
Cash and Cash Equivalents [Line Items]        
Overnight Holdings 0 0    
Short-term Investments 16 16    
Cash 0 0    
Drafts Payable 0 0    
Cash, Cash Equivalents, and Short-term Investments 16 16    
Cash and Cash Equivalents [Member]        
Cash and Cash Equivalents [Line Items]        
Overnight Holdings 365 611    
Short-term Investments 110 119    
Cash 11 27    
Drafts Payable (16) (64)    
Cash, Cash Equivalents, and Short-term Investments $ 470 $ 693