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CASH, CASH EQUIVALENTS AND INVESTMENTS - UNRESTRICTED AND RESTRICTED (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Restricted Cash and Cash Equivalents Items [Line Items]    
Cash and cash equivalents $ 177 $ 287
Investments 72 65
Total restricted cash, cash equivalents and investments 893 1,269
Investments, noncurrent 156 143
Restricted cash, cash equivalents and investments, noncurrent 163 158
Total 1,461 1,922
Payroll funds collected    
Restricted Cash and Cash Equivalents Items [Line Items]    
Total restricted cash, cash equivalents and investments 605 1,067
Collateral for health benefits claims    
Restricted Cash and Cash Equivalents Items [Line Items]    
Total restricted cash, cash equivalents and investments 147 144
Collateral for workers' compensation claims    
Restricted Cash and Cash Equivalents Items [Line Items]    
Total restricted cash, cash equivalents and investments 48 56
Restricted cash, cash equivalents and investments, noncurrent 163 158
Trust for our HRIS Users    
Restricted Cash and Cash Equivalents Items [Line Items]    
Total restricted cash, cash equivalents and investments 91 0
Other security deposits    
Restricted Cash and Cash Equivalents Items [Line Items]    
Total restricted cash, cash equivalents and investments 2 2
Cash and cash equivalents    
Restricted Cash and Cash Equivalents Items [Line Items]    
Cash and cash equivalents 177 287
Investments 0 0
Total restricted cash, cash equivalents and investments 780 1,154
Investments, noncurrent 0 0
Total 994 1,466
Cash and cash equivalents | Payroll funds collected    
Restricted Cash and Cash Equivalents Items [Line Items]    
Total restricted cash, cash equivalents and investments 605 1,067
Cash and cash equivalents | Collateral for health benefits claims    
Restricted Cash and Cash Equivalents Items [Line Items]    
Total restricted cash, cash equivalents and investments 34 31
Cash and cash equivalents | Collateral for workers' compensation claims    
Restricted Cash and Cash Equivalents Items [Line Items]    
Total restricted cash, cash equivalents and investments 48 54
Restricted cash, cash equivalents and investments, noncurrent 37 25
Cash and cash equivalents | Trust for our HRIS Users    
Restricted Cash and Cash Equivalents Items [Line Items]    
Total restricted cash, cash equivalents and investments   0
Cash and cash equivalents | Other security deposits    
Restricted Cash and Cash Equivalents Items [Line Items]    
Total restricted cash, cash equivalents and investments 2 2
Available-for-sale marketable securities    
Restricted Cash and Cash Equivalents Items [Line Items]    
Cash and cash equivalents 0 0
Investments 72 65
Total restricted cash, cash equivalents and investments 113 115
Investments, noncurrent 156 143
Total 467 456
Available-for-sale marketable securities | Payroll funds collected    
Restricted Cash and Cash Equivalents Items [Line Items]    
Total restricted cash, cash equivalents and investments 0 0
Available-for-sale marketable securities | Collateral for health benefits claims    
Restricted Cash and Cash Equivalents Items [Line Items]    
Total restricted cash, cash equivalents and investments 113 113
Available-for-sale marketable securities | Collateral for workers' compensation claims    
Restricted Cash and Cash Equivalents Items [Line Items]    
Total restricted cash, cash equivalents and investments 0 2
Restricted cash, cash equivalents and investments, noncurrent 126 133
Available-for-sale marketable securities | Trust for our HRIS Users    
Restricted Cash and Cash Equivalents Items [Line Items]    
Total restricted cash, cash equivalents and investments 0 0
Available-for-sale marketable securities | Other security deposits    
Restricted Cash and Cash Equivalents Items [Line Items]    
Total restricted cash, cash equivalents and investments $ 0 $ 0