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Other Balance Sheet Information (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Cash and Cash Equivalents [Line Items]        
Overnight Holdings $ 520 $ 611    
Short-term Investments 174 135    
Cash 14 27    
Drafts Payable (16) (64)    
Cash, Cash Equivalents, and Short-term Investments 692 709    
Payroll Withholdings Included in Cash Balance 459 510    
Client Prepayments Included in Cash Balance (22) (28)    
Cash and cash equivalents 676 693 $ 580 $ 733
Restricted cash 64 57 48 50
Funds Held for Clients 38 87 34 35
Deposits workers compensation 170 198 181 196
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Total 948 1,035 843 1,014
ERCFundsReceivedIncludedInCashBalance 97      
Supplemental cash flow information:        
Restricted cash 64 57 48 50
Funds Held for Clients 38 87 34 35
Deposits workers compensation 170 198 181 196
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Total 948 1,035 $ 843 $ 1,014
ERCFundsReceivedIncludedInCashBalance 97      
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 520 611    
Short-term Investments 158 119    
Cash 14 27    
Drafts Payable (16) (64)    
Cash, Cash Equivalents, and Short-term Investments $ 676 $ 693