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Cash and Cash Equivalents, Investments and Restricted Cash | 9 Months Ended
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Sep. 30, 2023
Cash and Cash Equivalents [Abstract] |
Cash and Cash Equivalents, Investments and Restricted Cash | Cash and Cash Equivalents, Investments and Restricted Cash The following table presents the amortized cost and estimated fair market value of our cash and cash equivalents, investments, and restricted cash as of the dates presented (in millions):
| September 30, 2023 |  | December 31, 2022
| Amortized Cost |  | Estimated Fair Market Value |  | Amortized Cost |  | Estimated Fair Market Value
Cash | $ | 110 |  |  | $ | 110 |  |  | $ | 128 |  |  | $ | 128 |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | 1,736 |  |  | 1,736 |  |  | 1,338 |  |  | 1,338 |
Short-term investments: |  |  |  |  |  |  |
U.S. government treasury securities(1) | 1,278 |  |  | 1,258 |  |  | 1,731 |  |  | 1,716 |
Corporate bonds | 136 |  |  | 135 |  |  | 162 |  |  | 161 |
Commercial paper | 14 |  |  | 14 |  |  | 10 |  |  | 10 |
U.S. government agency securities | 14 |  |  | 14 |  |  | 9 |  |  | 9 |
Restricted cash | 3 |  |  | 3 |  |  | 2 |  |  | 2 |
Total | $ | 3,291 |  |  | $ | 3,270 |  |  | $ | 3,380 |  |  | $ | 3,364 |
(1)The estimated fair market value includes $20 million and $15 million of gross unrealized losses as of September 30, 2023 and December 31, 2022, respectively.
The following table presents available-for-sale investments by contractual maturity date as of September 30, 2023 (in millions):
| Amortized Cost |  | Estimated Fair Market Value
Due in one year or less | $ | 513 |  |  | $ | 509 |
Due after one year | 929 |  |  | 912 |
Total | $ | 1,442 |  |  | $ | 1,421 |

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- Definition The entire disclosure of the components of cash, cash equivalents, and short-term investments. Short-term investments may include current marketable securities. + 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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