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CASH, CASH EQUIVALENTS AND INVESTMENTS - UNRESTRICTED AND RESTRICTED (Tables)
3 Months Ended
Mar. 31, 2025
Cash and Cash Equivalents [Abstract]  
Schedule of Cash, Cash Equivalents and Investments
Our total cash, cash equivalents and investments are summarized below:
March 31, 2025December 31, 2024
(in millions)Cash and cash equivalentsAvailable-for-sale marketable securitiesTotalCash and cash equivalentsAvailable-for-sale marketable securitiesTotal
Cash and cash equivalents$349 $ $349 $360 $— $360 
Restricted cash, cash equivalents and investments:
Payroll funds collected726  726 1,131 1,131 
Collateral for health benefits claims33 113 146 34 110 144 
Collateral for workers' compensation claims50  50 49 — 49 
Trust for our HRIS Users101  101 87 — 87 
Other security deposits1  1 — 
Total restricted cash, cash equivalents and investments911 113 1,024 1,303 110 1,413 
Restricted cash, cash equivalents and investments, noncurrent
Collateral for workers' compensation claims24 110 134 28 117 145 
Total$1,284 $223 $1,507 $1,691 $227 $1,918