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Condensed Consolidated Financial Statement Details - Equity Security Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Other nonoperating income (expense) |  |  |
Equity Securities without Readily Determinable Fair Value [Line Items] |  |  |
Gains and losses on investments, realized and unrealized | $ 126 | $ 214 |
Other Noncurrent Assets |  |  |
Equity Securities without Readily Determinable Fair Value [Line Items] |  |  |
Equity securities without readily determinable fair values | $ 354 | $ 354 | $ 81

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