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Cash and Cash Equivalents, Investments and Restricted Cash (Tables) | 3 Months Ended
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Mar. 31, 2023
Cash and Cash Equivalents [Abstract] |
Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Market Value of Cash and Cash Equivalents and Available-for-Sale Investments | 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):
| March 31, 2023 |  | December 31, 2022
| Amortized Cost |  | Estimated Fair Market Value |  | Amortized Cost |  | Estimated Fair Market Value
Cash | $ | 85 |  |  | $ | 85 |  |  | $ | 128 |  |  | $ | 128 |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | 1,309 |  |  | 1,309 |  |  | 1,338 |  |  | 1,338 |
Short-term investments: |  |  |  |  |  |  |
U. S. government treasury securities (1) | 1,765 |  |  | 1,762 |  |  | 1,731 |  |  | 1,716 |
Corporate bonds | 203 |  |  | 203 |  |  | 162 |  |  | 161 |
Commercial paper | 10 |  |  | 10 |  |  | 10 |  |  | 10 |
U.S. government agency securities | — |  |  | — |  |  | 9 |  |  | 9 |
Restricted cash | 2 |  |  | 2 |  |  | 2 |  |  | 2 |
Total | $ | 3,374 |  |  | $ | 3,371 |  |  | $ | 3,380 |  |  | $ | 3,364 |
(1) The estimated fair market value includes $4 million of gross unrealized gains and $7 million of gross unrealized losses as of March 31, 2023 and $15 million of gross unrealized losses as of December 31, 2022.
Debt Securities, Available-for-sale | The following table presents available-for-sale investments by contractual maturity date as of March 31, 2023 (in millions):
| Amortized Cost |  | Estimated Fair Market Value
Due in one year or less | $ | 883 |  |  | $ | 878 |
Due after one year | 1,095 |  |  | 1,097 |
Total | $ | 1,978 |  |  | $ | 1,975 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 + Details
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- Definition Tabular disclosure of the components of cash, cash equivalents, and investments. + References No definition available. + Details
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