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Investments (Tables) | 3 Months Ended
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Mar. 27, 2021
Investments and Cash [Abstract] |
Investments Classified by Contractual Maturity Date [Table Text Block] | The fair value of available-for-sale debt investments, by contractual maturity, as of March 27, 2021, was as follows:
(In Millions) |  | Fair Value
Due in 1 year or less |  | $ | 3,596 |
Due in 1–2 years |  | 341 |
Due in 2–5 years |  | 1,068 |
Due after 5 years |  | — |
Instruments not due at a single maturity date |  | 2,130 |
Total |  | $ | 7,135 |
Investment [Table Text Block] |
(In Millions) |  | Mar 27, 2021 |  | Dec 26, 2020
Marketable equity securities |  | $ | 1,523 |  |  | $ | 1,830 |
Non-marketable equity securities |  | 3,864 |  |  | 3,304 |
Equity method investments |  | 17 |  |  | 18 |
Total |  | $ | 5,404 |  |  | $ | 5,152 |
Gain (Loss) on Securities [Table Text Block] | The components of gains (losses) on equity investments, net for each period were as follows:
|  | Three Months Ended |  |  |  |
(In Millions) |  | Mar 27, 2021 |  | Mar 28, 2020 |  |  |  |
Ongoing mark-to-market adjustments on marketable equity securities |  | $ | (291) |  |  | $ | (103) |  |  |  |  |
Observable price adjustments on non-marketable equity securities |  | 551 |  |  | 79 |  |  |  |  |
Impairment charges |  | (38) |  |  | (143) |  |  |  |  |
Sale of equity investments and other¹ |  | 146 |  |  | 56 |  |  |  |  |
Total gains (losses) on equity investments, net |  | $ | 368 |  |  | $ | (111) |  |  |  |  |
1 Sale of equity investments and other includes realized gains (losses) on sales of non-marketable equity investments, our share of equity method investees' gains (losses) and distributions, and initial fair value adjustments recorded upon a security becoming marketable. Gains and losses for our marketable and non-marketable equity securities for each period were as follows:
|  | Three Months Ended |
(In Millions) |  | Mar 27, 2021 |  | Mar 28, 2020 |
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) |  |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References No definition available. + Details
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