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Cash and Cash Equivalents, Investments and Restricted Cash (Tables) | 9 Months Ended
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Sep. 30, 2022
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 tables present the amortized cost, gross unrealized gains and losses and estimated fair market value of our cash and cash equivalents, investments, and restricted cash as of the dates presented (in millions):
| September 30, 2022
| Amortized Cost |  |  |  | Gross Unrealized Losses |  | Estimated Fair Market Value
Cash | $ | 153 |  |  |  |  | $ | — |  |  | $ | 153 |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | 1,820 |  |  |  |  | — |  |  | 1,820 |
Short-term investments: |  |  |  |  |  |  |
U. S. government agency securities | 1,371 |  |  |  |  | (18) |  |  | 1,353 |
Corporate bonds | 119 |  |  |  |  | (1) |  |  | 118 |
Treasury bills | 45 |  |  |  |  | — |  |  | 45 |
Restricted cash | 2 |  |  |  |  | — |  |  | 2 |
Total | $ | 3,510 |  |  |  |  | $ | (19) |  |  | $ | 3,491 |
| December 31, 2021
| Amortized Cost |  |  |  | Gross Unrealized Losses |  | Estimated Fair Market Value
Cash | $ | 183 |  |  |  |  | $ | — |  |  | $ | 183 |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | 2,132 |  |  |  |  | — |  |  | 2,132 |
Short-term investments: |  |  |  |  |  |  |
U.S. government agency securities | 473 |  |  |  |  | (2) |  |  | 471 |
Corporate bonds | 33 |  |  |  |  | — |  |  | 33 |
Commercial paper | 10 |  |  |  |  | — |  |  | 10 |
Restricted cash | 1 |  |  |  |  | — |  |  | 1 |
Total | $ | 2,832 |  |  |  |  | $ | (2) |  |  | $ | 2,830 |
Debt Securities, Available-for-sale | The following table presents available-for-sale investments by contractual maturity date as of September 30, 2022 (in millions):
| Amortized Cost |  | Estimated Fair Market Value
Due in one year or less | $ | 1,096 |  |  | $ | 1,083 |
Due after one year | 439 |  |  | 433 |
Total | $ | 1,535 |  |  | $ | 1,516 |

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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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