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Cash, Cash Equivalents and Investments - Unrestricted and Restricted
 9 Months Ended
Sep. 30, 2021
Cash and Cash Equivalents [Abstract]  
CASH, CASH EQUIVALENTS AND INVESTMENTS - UNRESTRICTED AND RESTRICTED CASH, CASH EQUIVALENTS AND INVESTMENTS - UNRESTRICTED AND RESTRICTED
Under the terms of the agreements with certain of our workers' compensation and health benefit insurance carriers, we are required to maintain collateral in trust accounts for the benefit of specified insurance carriers and to reimburse the carriers’ claim payments within our deductible layer. We invest a portion of the collateral amounts in marketable securities. We report the current and noncurrent portions of these trust accounts as restricted cash, cash equivalents and investments on the consolidated balance sheets.
We require our clients to prefund their payroll and related taxes and other withholding liabilities before payroll is processed or due for payment. This prefund is included in restricted cash, cash equivalents and investments as payroll funds collected, which is designated to pay pending payrolls, payroll tax liabilities and other payroll withholdings.
We also invest available corporate funds, primarily in fixed income securities which meet the requirements of our corporate investment policy and are classified as available for sale (AFS).
Our total cash, cash equivalents and investments are summarized below:
September 30, 2021December 31, 2020
(in millions)Cash and cash equivalentsAvailable-for-sale marketable securitiesTotalCash and cash equivalentsAvailable-for-sale marketable securitiesTotal
Cash and cash equivalents$525 $— $525 $301 $— $301 
Investments— 155 155 — 57 57 
Restricted cash, cash equivalents and investments:
Payroll funds collected863 — 863 1,228 — 1,228 
Collateral for health benefits claims24 94 118 16 82 98 
Collateral for workers' compensation claims57 — 57 60 — 60 
Other security deposits2 — 2 2 — 2 
Total restricted cash, cash equivalents and investments946 94 1,040 1,306 82 1,388 
Investments, noncurrent— 167 167 — 138 138 
Restricted cash, cash equivalents and investments, noncurrent
Collateral for workers' compensation claims31 145 176 36 174 210 
Total$1,502 $561 $2,063 $1,643 $451 $2,094