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Investments and Fair Value Measurement - Summary of Amortized Cost, Unrealized Gains and Losses of Financial Assets (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 2,281 | $ 2,281
Recurring |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,281 | 3,756
Unrealized Gains | 1,808 | 61
Unrealized Losses | 0 | 0
Fair Value | 4,089 | 3,817
Recurring | Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 0 | 611
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 0 | 611
Recurring | U.S. government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 0 | 542
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 0 | 542
Recurring | Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 0 | 322
Unrealized Gains | 0 | 1
Unrealized Losses | 0 | 0
Fair Value | 0 | 323
Recurring | Non-marketable debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,281 | 2,281
Unrealized Gains | 1,808 | 60
Unrealized Losses | 0 | 0
Fair Value | $ 4,089 | $ 2,341

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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