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Investments, Equity Investments (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 27, 2021 | Mar. 28, 2020 | Dec. 26, 2020
Schedule of Investments [Line Items] |  |  |
Marketable Securities | $ 1,523 |  | $ 1,830
Cost Method Investments | 3,864 |  | 3,304
Equity Method Investments | 17 |  | 18
Equity Investments | 5,404 |  | $ 5,152
Mark to market on marketable equity securities1 | (291) | $ (103) |
Observable price adjustments on non-marketable | 551 | 79 |
Impairments | (38) | (143) |
Other Net Equity Investments | 146 | 56 |
Gain (Loss) on Investments | 368 | (111) |
Net gains (losses) recognized during the period on equity securities | 311 | (140) |
Less: Net (gains) losses recognized during the period on equity securities sold during the period | (85) | (7) |
Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date | 226 | $ (147) |
Bejing Unisoc Technology Ltd. |  |  |
Schedule of Investments [Line Items] |  |  |
Gain (Loss) on Investments | $ 471 |  |

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