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Cash and Cash Equivalents, Investments and Restricted Cash | 12 Months Ended
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Dec. 31, 2022
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):
| December 31, 2022 |  | December 31, 2021
| Amortized Cost |  | Estimated Fair Market Value |  | Amortized Cost |  | Estimated Fair Market Value
Cash | $ | 128 |  |  | $ | 128 |  |  | $ | 183 |  |  | $ | 183 |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | 1,338 |  |  | 1,338 |  |  | 2,132 |  |  | 2,132 |
Short-term investments: |  |  |  |  |  |  |
U.S. government treasury securities (1) | 1,731 |  |  | 1,716 |  |  | 473 |  |  | 471 |
Corporate bonds (2) | 162 |  |  | 161 |  |  | 33 |  |  | 33 |
Commercial paper | 10 |  |  | 10 |  |  | 10 |  |  | 10 |
U.S. government agency securities | 9 |  |  | 9 |  |  | — |  |  | — |
Restricted cash | 2 |  |  | 2 |  |  | 1 |  |  | 1 |
Total | $ | 3,380 |  |  | $ | 3,364 |  |  | $ | 2,832 |  |  | $ | 2,830 |
(1) The estimated fair market value includes $15 million and $2 million of gross unrealized losses as of December 31, 2022 and December 31, 2021, respectively.
(2) The estimated fair market value includes $1 million of gross unrealized losses as of December 31, 2022.
The following table presents available-for-sale investments by contractual maturity date as of December 31, 2022 (in millions):
| Amortized Cost |  | Estimated Fair Market Value
Due in one year or less | $ | 1,159 |  |  | $ | 1,150 |
Due after one year | 753 |  |  | 746 |
Total | $ | 1,912 |  |  | $ | 1,896 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 + Details
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