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Other Balance Sheet Information (Notes) | 3 Months Ended
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Mar. 31, 2024
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3. | Other Balance Sheet Information
Cash, Cash Equivalents and Marketable Securities The following table summarizes our cash and investments in cash equivalents and marketable securities held by investment managers and overnight investments:
| March 31, 2024 |  | December 31, 2023
(in millions) | Cash & Cash Equivalents | Marketable Securities | Total |  | Cash & Cash Equivalents | Marketable Securities | Total
Overnight holdings | $ | 356 |  | $ | — |  | $ | 356 |  |  | $ | 611 |  | $ | — |  | $ | 611 |
Investment holdings | 118 |  | 16 |  | 134 |  |  | 119 |  | 16 |  | 135 |
| 474 |  | 16 |  | 490 |  |  | 730 |  | 16 |  | 746 |
Cash in demand accounts | 212 |  | — |  | 212 |  |  | 27 |  | — |  | 27 |
Outstanding checks | (19) |  | — |  | (19) |  |  | (64) |  | — |  | (64) |
Total | $ | 667 |  | $ | 16 |  | $ | 683 |  |  | $ | 693 |  | $ | 16 |  | $ | 709 |
Our cash and overnight holdings fluctuate based on the timing of clients’ payroll processing cycles. Our cash, cash equivalents and marketable securities at March 31, 2024 and December 31, 2023 included $443 million and $510 million, respectively, of funds associated with federal and state income tax withholdings, employment taxes, and other payroll deductions, as well as $34 million and $28 million, respectively, in client prepayments. Cash, Cash Equivalents, Restricted Cash and Funds Held for Clients The following table summarizes our cash, cash equivalents, restricted cash and funds held for clients as reported in our Consolidated Statements of Cash Flows:
| Three Months Ended March 31,
(in millions) | 2024 |  | 2023
Supplemental schedule of cash and cash equivalents, restricted cash and funds held for clients |  |  |
Cash and cash equivalents | $ | 693 |  |  | $ | 733 |
Restricted cash | 57 |  |  | 50 |
Other current assets – funds held for clients(1) | 87 |  |  | 35 |
Deposits – workers’ compensation | 198 |  |  | 196 |
Cash, cash equivalents, restricted cash and funds held for clients beginning of period | $ | 1,035 |  |  | $ | 1,014 |
Cash and cash equivalents | $ | 667 |  |  | $ | 697 |
Restricted cash | 61 |  |  | 48 |
Other current assets – funds held for clients(1) | 46 |  |  | 42 |
Deposits – workers’ compensation | 204 |  |  | 211 |
Cash, cash equivalents, restricted cash and funds held for clients end of period | $ | 978 |  |  | $ | 998 |
____________________________________ (1)Funds held for clients represent amounts held on behalf of our Traditional Payroll Solution customers that are restricted for the purpose of satisfying obligations to remit funds to clients’ employees and various tax authorities. Please read Note 2. “Accounting Policies,” for a discussion of our accounting policies for deposits – workers’ compensation and restricted cash.

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