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Other Balance Sheet Information (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Cash and Cash Equivalents [Line Items]        
Overnight Holdings $ 356 $ 611    
Short-term Investments 134 135    
Cash 212 27    
Drafts Payable (19) (64)    
Cash, Cash Equivalents, and Short-term Investments 683 709    
Payroll Withholdings Included in Cash Balance 443 510    
Client Prepayments Included in Cash Balance (34) (28)    
Cash and cash equivalents 667 693 $ 697 $ 733
Restricted cash 61 57 48 50
Funds Held for Clients 46 87 42 35
Deposits workers compensation 204 198 211 196
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Total 978 1,035 998 1,014
Supplemental cash flow information:        
Restricted cash 61 57 48 50
Funds Held for Clients 46 87 42 35
Deposits workers compensation 204 198 211 196
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Total 978 1,035 $ 998 $ 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 356 611    
Short-term Investments 118 119    
Cash 212 27    
Drafts Payable (19) (64)    
Cash, Cash Equivalents, and Short-term Investments $ 667 $ 693