| Cash and Investments (Tables)
 | 3 Months Ended | 
| Apr. 02, 2016 | 
|---|
| Investments and Cash [Abstract] |  | 
| Schedule of Total Cash and Investments [Table Text Block] | 
Cash and investments at the end of each period were as follows:
|  |  
|  |  |  |  |  |  |  |  |  |  
| (In Millions) |   | Apr 2, 2016
 |   | Dec 26, 2015
 |  
| Available-for-sale investments |   | $ | 14,169 | 
 |   | $ | 22,007 | 
 |  
| Cash |   | 875 | 
 |   | 1,466 | 
 |  
| Equity method investments |   | 1,593 | 
 |   | 1,590 | 
 |  
| Loans receivable |   | 1,038 | 
 |   | 794 | 
 |  
| Non-marketable cost method investments |   | 2,933 | 
 |   | 2,933 | 
 |  
| Reverse repurchase agreements |   | 768 | 
 |   | 3,368 | 
 |  
| Trading assets |   | 9,103 | 
 |   | 7,323 | 
 |  
| Total cash and investments |   | $ | 30,479 | 
 |   | $ | 39,481 | 
 |  | 
| Schedule of Available-For-Sale Securities [Line Items] |  | 
| Schedule of Available-for-sale Securities Reconciliation [Table Text Block] | 
Available-for-sale investments at the end of each period were as follows:
|  |  
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|   |   | April 2, 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 |  
| Asset-backed securities |   | $ | — | 
 |   | $ | — | 
 |   | $ | — | 
 |   | $ | — | 
 |   | $ | 5 | 
 |   | $ | — | 
 |   | $ | (1 | ) |   | $ | 4 | 
 |  
| Corporate debt |   | 3,133 | 
 |   | 5 | 
 |   | (9 | ) |   | 3,129 | 
 |   | 4,164 | 
 |   | 3 | 
 |   | (10 | ) |   | 4,157 | 
 |  
| Financial institution instruments |   | 4,196 | 
 |   | 3 | 
 |   | (3 | ) |   | 4,196 | 
 |   | 11,140 | 
 |   | 1 | 
 |   | (2 | ) |   | 11,139 | 
 |  
| Government debt |   | 467 | 
 |   | — | 
 |   | — | 
 |   | 467 | 
 |   | 748 | 
 |   | — | 
 |   | (1 | ) |   | 747 | 
 |  
| Marketable equity securities |   | 3,230 | 
 |   | 3,148 | 
 |   | (1 | ) |   | 6,377 | 
 |   | 3,254 | 
 |   | 2,706 | 
 |   | — | 
 |   | 5,960 | 
 |  
| Total available-for-sale investments |   | $ | 11,026 | 
 |   | $ | 3,156 | 
 |   | $ | (13 | ) |   | $ | 14,169 | 
 |   | $ | 19,311 | 
 |   | $ | 2,710 | 
 |   | $ | (14 | ) |   | $ | 22,007 | 
 |  | 
| Available-for-sale Securities [Member] |  | 
| Schedule of Available-For-Sale Securities [Line Items] |  | 
| Investments Classified by Contractual Maturity Date [Table Text Block] | 
The amortized cost and fair value of available-for-sale debt investments, by contractual maturity, as of April 2, 2016, were as follows:
|  |  
|  |  |  |  |  |  |  |  |  |  
| (In Millions) |   | Cost |   | Fair Value |  
| Due in 1 year or less |   | $ | 4,230 | 
 |   | $ | 4,229 | 
 |  
| Due in 1–2 years |   | 1,835 | 
 |   | 1,834 | 
 |  
| Due in 2–5 years |   | 1,266 | 
 |   | 1,264 | 
 |  
| Instruments not due at a single maturity date |   | 465 | 
 |   | 465 | 
 |  
| Total |   | $ | 7,796 | 
 |   | $ | 7,792 | 
 |  |