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Investments (Tables) | 12 Months Ended
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Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items] |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] | Available-for-Sale Investments
|  | December 31, 2016 |  | December 26, 2015
(In Millions) |  | Adjusted Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Adjusted Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Corporate debt |  | $ | 3,847 |  |  | $ | 4 |  |  | $ | (14 | ) |  | $ | 3,837 |  |  | $ | 4,169 |  |  | $ | 3 |  |  | $ | (11 | ) |  | $ | 4,161 |
Financial institution instruments |  | 6,098 |  |  | 5 |  |  | (11 | ) |  | 6,092 |  |  | 11,140 |  |  | 1 |  |  | (2 | ) |  | 11,139 |
Government debt |  | 1,581 |  |  | — |  |  | (8 | ) |  | 1,573 |  |  | 748 |  |  | — |  |  | (1 | ) |  | 747 |
Marketable equity securities |  | 2,818 |  |  | 3,363 |  |  | (1 | ) |  | 6,180 |  |  | 3,254 |  |  | 2,706 |  |  | — |  |  | 5,960 |
Total available-for-sale investments |  | $ | 14,344 |  |  | $ | 3,372 |  |  | $ | (34 | ) |  | $ | 17,682 |  |  | $ | 19,311 |  |  | $ | 2,710 |  |  | $ | (14 | ) |  | $ | 22,007 |
Equity Method Investments [Table Text Block] | Equity method investments, classified within other long-term assets, at the end of each period were as follows:
|  | December 31, 2016 |  | December 26, 2015
(Dollars In Millions) |  | Carrying Value |  | Ownership Percentage |  | Carrying Value |  | Ownership Percentage
IM Flash Technologies, LLC |  | $ | 849 |  |  | 49 | % |  | $ | 872 |  |  | 49 | %
Cloudera, Inc. |  | 225 |  |  | 16 | % |  | 256 |  |  | 17 | %
Other equity method investments |  | 254 |  |  |  |  | 462 |  |  |
Total |  | $ | 1,328 |  |  |  |  | $ | 1,590 |  |  |
Available-for-sale Securities [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Investments Classified by Contractual Maturity Date [Table Text Block] | The fair value of available-for-sale debt investments, by contractual maturity, as of December 31, 2016 were as follows:
(In Millions) |  | Fair Value
Due in 1 year or less |  | $ | 4,866 |
Due in 1–2 years |  | 1,956 |
Due in 2–5 years |  | 2,760 |
Instruments not due at a single maturity date |  | 1,920 |
Total |  | $ | 11,502 |

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