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Cash, Cash Equivalents and Marketable Securities | 9 Months Ended
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Sep. 30, 2023
Cash, Cash Equivalents and Marketable Securities [Abstract] |
Cash, Cash Equivalents and Marketable Securities | Cash, cash equivalents and marketable securities The following table summarizes the amortized cost, gross unrealized gains and losses and the fair value of our cash, cash equivalents and marketable securities, all of which are considered available for sale, by type of securities (in millions):
Types of securities as of September 30, 2023 |  | Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Fair Value
Money market funds |  | $ | 110 |  |  | $ | — |  |  | $ | — |  |  | $ | 110 |
U.S. treasury securities |  | 246 |  |  | — |  |  | (1) |  |  | 245 |
Corporate securities and commercial paper |  | 493 |  |  | — |  |  | (2) |  |  | 491 |
U.S. government agency securities |  | 96 |  |  | — |  |  | — |  |  | 96 |
Certificate of deposit |  | 8 |  |  | — |  |  | — |  |  | 8 |
Total cash, cash equivalents and marketable securities |  | $ | 953 |  |  | $ | — |  |  | $ | (3) |  |  | $ | 950 |
Types of securities as of December 31, 2022 |  | Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Fair Value
Money market funds |  | $ | 169 |  |  | $ | — |  |  | $ | — |  |  | $ | 169 |
U.S. treasury securities |  | 317 |  |  | — |  |  | (3) |  |  | 314 |
Corporate securities and commercial paper |  | 635 |  |  | — |  |  | (4) |  |  | 631 |
U.S. government agency securities |  | 20 |  |  | — |  |  | — |  |  | 20 |
Certificate of deposit |  | 4 |  |  | — |  |  | — |  |  | 4 |
Total cash, cash equivalents and marketable securities |  | $ | 1,145 |  |  | $ | — |  |  | $ | (7) |  |  | $ | 1,138 |
The following table summarizes the fair values of our cash, cash equivalents and marketable securities by location in the Condensed Consolidated Balance Sheets and contractual maturity (in millions):
Location in Condensed Consolidated Balance Sheets |  | Contractual Maturity |  | September 30, 2023 |  | December 31, 2022
Cash and cash equivalents |  | - |  | $ | 184 |  |  | $ | 206 |
Marketable securities |  | Within one year |  | 615 |  |  | 803 |
Long-term marketable securities |  | Between one and three years |  | 151 |  |  | 129 |
Total cash, cash equivalents and marketable securities |  |  |  | $ | 950 |  |  | $ | 1,138 |
Realized gains or losses recognized on the sale of available-for-sale marketable securities were not material for the three and nine months ended September 30, 2023 and 2022. Realized gains and losses are included in Interest and other income, net, in the Condensed Consolidated Statements of Operations. The cost of a security sold is determined using the specific-identification method. We limit the credit risk associated with our investments by placing them with banks and institutions we believe are highly credit worthy and investing in highly rated investments. We held a total of 159 and 219 positions in securities which were in unrealized loss positions as of September 30, 2023 and December 31, 2022, respectively. We do not intend to sell our securities with unrealized loss positions and have concluded we will not be required to sell the securities before recovery of the amortized cost for the investment at maturity. No credit related losses have been recognized for any of the periods presented. The following table provides a reconciliation of cash, cash equivalents, and restricted cash within the Condensed Consolidated Balance Sheets to the total shown in the Condensed Consolidated Statements of Cash Flows (in millions):
| September 30,
| 2023 |  | 2022
Cash and cash equivalents | $ | 184 |  |  | $ | 218 |
Restricted cash (included in Other noncurrent assets) | 3 |  |  | 3 |
Total cash, cash equivalents and restricted cash | $ | 187 |  |  | $ | 221 |

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- Definition Cash, cash equivalents and marketable securities. + References No definition available. + Details
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- Definition The entire disclosure of cash, cash equivalents, and debt and equity securities, including any unrealized or realized gain (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//320/tableOfContent + Details
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