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CASH, CASH EQUIVALENTS AND INVESTMENTS - UNRESTRICTED AND RESTRICTED (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Restricted Cash and Cash Equivalents Items [Line Items]    
Cash and cash equivalents $ 298 $ 287
Investments 85 65
Total restricted cash, cash equivalents and investments 1,059 1,269
Investments, noncurrent 161 143
Restricted cash, cash equivalents and investments, noncurrent 152 158
Total 1,755 1,922
Payroll funds collected    
Restricted Cash and Cash Equivalents Items [Line Items]    
Total restricted cash, cash equivalents and investments 743 1,067
Collateral for health benefits claims    
Restricted Cash and Cash Equivalents Items [Line Items]    
Total restricted cash, cash equivalents and investments 146 144
Collateral for workers' compensation claims    
Restricted Cash and Cash Equivalents Items [Line Items]    
Total restricted cash, cash equivalents and investments 55 56
Restricted cash, cash equivalents and investments, noncurrent 152 158
Trust for our HRIS Users    
Restricted Cash and Cash Equivalents Items [Line Items]    
Total restricted cash, cash equivalents and investments 113 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 298 287
Investments 0 0
Total restricted cash, cash equivalents and investments 945 1,154
Investments, noncurrent 0 0
Total 1,267 1,466
Cash and cash equivalents | Payroll funds collected    
Restricted Cash and Cash Equivalents Items [Line Items]    
Total restricted cash, cash equivalents and investments 743 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 32 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 55 54
Restricted cash, cash equivalents and investments, noncurrent 24 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 113 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 85 65
Total restricted cash, cash equivalents and investments 114 115
Investments, noncurrent 161 143
Total 488 456
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 114 113
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 128 133
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