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Investments and Fair Value Measurement - Fair Value on a Recurring Basis (Details) - Recurring - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financial Assets |  |
Non-marketable debt securities: | $ 4,270 | $ 3,817
Note receivable from a related party | 81 | 83
Total financial assets | 16,030 | 6,338
Money market funds |  |
Financial Assets |  |
Cash and cash equivalents | 2,170 | 2,386
Commercial paper |  |
Financial Assets |  |
Non-marketable debt securities: | 314 | 611
U.S. government and agency securities |  |
Financial Assets |  |
Non-marketable debt securities: | 266 | 542
Corporate bonds |  |
Financial Assets |  |
Non-marketable debt securities: | 98 | 323
Non-marketable debt securities |  |
Financial Assets |  |
Non-marketable debt securities: | 3,592 | 2,341
Non-marketable equity securities |  |
Financial Assets |  |
Non-marketable equity securities | 9,509 | 52
Level 1 |  |
Financial Assets |  |
Note receivable from a related party | 0 | 0
Total financial assets | 2,170 | 2,386
Level 1 | Money market funds |  |
Financial Assets |  |
Cash and cash equivalents | 2,170 | 2,386
Level 1 | Commercial paper |  |
Financial Assets |  |
Non-marketable debt securities: | 0 | 0
Level 1 | U.S. government and agency securities |  |
Financial Assets |  |
Non-marketable debt securities: | 0 | 0
Level 1 | Corporate bonds |  |
Financial Assets |  |
Non-marketable debt securities: | 0 | 0
Level 1 | Non-marketable debt securities |  |
Financial Assets |  |
Non-marketable debt securities: | 0 | 0
Level 1 | Non-marketable equity securities |  |
Financial Assets |  |
Non-marketable equity securities | 0 | 0
Level 2 |  |
Financial Assets |  |
Note receivable from a related party | 0 | 0
Total financial assets | 8,004 | 1,476
Level 2 | Money market funds |  |
Financial Assets |  |
Cash and cash equivalents | 0 | 0
Level 2 | Commercial paper |  |
Financial Assets |  |
Non-marketable debt securities: | 314 | 611
Level 2 | U.S. government and agency securities |  |
Financial Assets |  |
Non-marketable debt securities: | 266 | 542
Level 2 | Corporate bonds |  |
Financial Assets |  |
Non-marketable debt securities: | 98 | 323
Level 2 | Non-marketable debt securities |  |
Financial Assets |  |
Non-marketable debt securities: | 0 | 0
Level 2 | Non-marketable equity securities |  |
Financial Assets |  |
Non-marketable equity securities | 7,326 | 0
Level 3 |  |
Financial Assets |  |
Note receivable from a related party | 81 | 83
Total financial assets | 5,856 | 2,476
Level 3 | Money market funds |  |
Financial Assets |  |
Cash and cash equivalents | 0 | 0
Level 3 | Commercial paper |  |
Financial Assets |  |
Non-marketable debt securities: | 0 | 0
Level 3 | U.S. government and agency securities |  |
Financial Assets |  |
Non-marketable debt securities: | 0 | 0
Level 3 | Corporate bonds |  |
Financial Assets |  |
Non-marketable debt securities: | 0 | 0
Level 3 | Non-marketable debt securities |  |
Financial Assets |  |
Non-marketable debt securities: | 3,592 | 2,341
Level 3 | Non-marketable equity securities |  |
Financial Assets |  |
Non-marketable equity securities | $ 2,183 | $ 52

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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