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CASH, CASH EQUIVALENTS AND INVESTMENTS - UNRESTRICTED AND RESTRICTED (Tables)
9 Months Ended
Sep. 30, 2024
Cash and Cash Equivalents [Abstract]  
Schedule of Cash, Cash Equivalents and Investments
Our total cash, cash equivalents and investments are summarized below:
September 30, 2024December 31, 2023
(in millions)Cash and cash equivalentsAvailable-for-sale marketable securitiesTotalCash and cash equivalentsAvailable-for-sale marketable securitiesTotal
Cash and cash equivalents$251 $ $251 $287 $— $287 
Investments 50 50 — 65 65 
Restricted cash, cash equivalents and investments:
Payroll funds collected496  496 1,067 — 1,067 
Collateral for health benefits claims42 111 153 31 113 144 
Collateral for workers' compensation claims48  48 54 56 
Trust for our HRIS Users81  81 — — — 
Other security deposits2  2 — 
Total restricted cash, cash equivalents and investments669 111 780 1,154 115 1,269 
Investments, noncurrent 145 145 — 143 143 
Restricted cash, cash equivalents and investments, noncurrent
Collateral for workers' compensation claims28 125 153 25 133 158 
Total$948 $431 $1,379 $1,466 $456 $1,922