| Borrowings (Tables)
 | 12 Months Ended | 
| Dec. 26, 2015 | 
|---|
| Debt Disclosure [Abstract] |  | 
| Schedule of Short-term Debt [Table Text Block] | 
Our short-term debt at the end of each period was as follows:
|  |  
|  |  |  |  |  |  |  |  |  |  
| (In Millions) |   | Dec 26, 2015
 |   | Dec 27, 2014
 |  
| Drafts payable |   | $ | 41 | 
 |   | $ | 16 | 
 |  
| Commercial paper |   | — | 
 |   | 500 | 
 |  
| Current portion of long-term debt |   | 2,602 | 
 |   | 1,088 | 
 |  
| Less: debt issuance costs associated with the current portion of long-term debt |   | (9 | ) |   | (8 | ) |  
| Total short-term debt |   | $ | 2,634 | 
 |   | $ | 1,596 | 
 |  | 
| Schedule of Long-term Debt Instruments [Table Text Block] | 
Our long-term debt at the end of each period was as follows:
|  |  
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
| (In Millions) |   | Maturity Date |   | Stated Interest Rate |   | Dec 26, 2015
 |   | Dec 27, 2014
 |  
| Fourth quarter 2015 debt issuance of $915 million |   |   |   |   |   |   |   |   |  
| Senior notes |   | December 2045 |   | 4.70 | % |   | $ | 908 | 
 |   | $ | — | 
 |  
| Fourth quarter 2015 Australian dollar-denominated debt issuance of A$800 million |   |   |   |   |   |   |   |   |  
| 
Senior notes1
 |   | December 2019 |   | 3.25 | % |   | 181 | 
 |   | — | 
 |  
| 
Senior notes1
 |   | December 2022 |   | 4.00 | % |   | 397 | 
 |   | — | 
 |  
| Third quarter 2015 debt issuance of $1.0 billion |   |   |   |   |   |   |   |   |  
| Senior notes |   | August 2045 |   | 4.90 | % |   | 1,009 | 
 |   | — | 
 |  
| Third quarter 2015 debt issuance of $7.0 billion |   |   |   |   |   |   |   |   |  
| Senior notes |   | July 2020 |   | 2.45 | % |   | 1,748 | 
 |   | — | 
 |  
| Senior notes |   | July 2022 |   | 3.10 | % |   | 996 | 
 |   | — | 
 |  
| Senior notes |   | July 2025 |   | 3.70 | % |   | 2,247 | 
 |   | — | 
 |  
| Senior notes |   | July 2045 |   | 4.90 | % |   | 1,998 | 
 |   | — | 
 |  
| 2012 debt issuance of $6.2 billion |   |   |   |   |   |   |   |   |  
| Senior notes |   | December 2017 |   | 1.35 | % |   | 2,999 | 
 |   | 2,998 | 
 |  
| Senior notes |   | December 2022 |   | 2.70 | % |   | 1,492 | 
 |   | 1,495 | 
 |  
| Senior notes |   | December 2032 |   | 4.00 | % |   | 744 | 
 |   | 744 | 
 |  
| Senior notes |   | December 2042 |   | 4.25 | % |   | 924 | 
 |   | 924 | 
 |  
| 2011 debt issuance of $5.0 billion |   |   |   |   |   |   |   |   |  
| Senior notes |   | October 2016 |   | 1.95 | % |   | 1,499 | 
 |   | 1,499 | 
 |  
| Senior notes |   | October 2021 |   | 3.30 | % |   | 1,997 | 
 |   | 1,997 | 
 |  
| Senior notes |   | October 2041 |   | 4.80 | % |   | 1,490 | 
 |   | 1,490 | 
 |  
| 2009 debt issuance of $2.0 billion |   |   |   |   |   |   |   |   |  
| Junior subordinated convertible debentures |   | August 2039 |   | 3.25 | % |   | 1,103 | 
 |   | 1,088 | 
 |  
| 2005 debt issuance of $1.6 billion |   |   |   |   |   |   |   |   |  
| Junior subordinated convertible debentures |   | December 2035 |   | 2.95 | % |   | 975 | 
 |   | 960 | 
 |  
| Long-term debt |   |   |   |   |   | 22,707 | 
 |   | 13,195 | 
 |  
| Less: current portion of long-term debt |   |   |   |   |   | (2,602 | ) |   | (1,088 | ) |  
| Less: debt issuance costs |   |   |   |   |   | (69 | ) |   | (48 | ) |  
| Total long-term debt |   |   |   |   |   | $ | 20,036 | 
 |   | $ | 12,059 | 
 | 
 
|  |  |  
| 1  | 
To manage foreign currency risk associated with the Australian-dollar-denominated notes issued in 2015, we entered into currency interest rate swaps with an aggregate notional amount of $577 million, which effectively converted these notes to U.S.-dollar-denominated notes. For further discussion on our currency interest rate swaps, see "Note 6: Derivative Financial Instruments." 
 |  | 
| Convertible Debentures Interest Rates [Table Text Block] | 
|  |  
|  |  |  |  |  |  |  |  
|   |   | 2009 Debentures |   | 2005 Debentures |  
| Annual stated coupon interest rate |   | 3.25 | % |   | 2.95 | % |  
| Annual effective interest rate |   | 7.20 | % |   | 6.45 | % |  | 
| Convertible Debentures Other Details [Table Text Block] | 
|  |  
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|   |   | 2009 Debentures |   | 2005 Debentures |  
| (In Millions, Except Per Share Amounts) |   | Dec 26, 2015
 |   | Dec 27, 2014
 |   | Dec 26, 2015
 |   | Dec 27, 2014
 |  
| Outstanding principal |   | $ | 2,000 | 
 |   | $ | 2,000 | 
 |   | $ | 1,600 | 
 |   | $ | 1,600 | 
 |  
| Equity component (including temporary equity) carrying amount |   | $ | 613 | 
 |   | $ | 613 | 
 |   | $ | 466 | 
 |   | $ | 466 | 
 |  
| Unamortized discount |   | $ | 897 | 
 |   | $ | 912 | 
 |   | $ | 625 | 
 |   | $ | 640 | 
 |  
| Net debt carrying amount |   | $ | 1,103 | 
 |   | $ | 1,088 | 
 |   | $ | 975 | 
 |   | $ | 960 | 
 |  
| Conversion rate (shares of common stock per $1,000 principal amount of debentures) |   | 46.58 | 
 |   | 46.06 | 
 |   | 35.82 | 
 |   | 34.95 | 
 |  
| Effective conversion price (per share of common stock) |   | $ | 21.47 | 
 |   | $ | 21.71 | 
 |   | $ | 27.92 | 
 |   | $ | 28.61 | 
 |  | 
| Schedule of Maturities of Long-term Debt [Table Text Block] | 
Our aggregate debt maturities based on outstanding principal as of December 26, 2015, by year payable, were as follows:
|  |  
|  |  |  |  |  |  
| (In Millions) |   |   |  
| 2016 |   | $ | 1,500 | 
 |  
| 2017 |   | 3,000 | 
 |  
| 2018 |   | — | 
 |  
| 2019 |   | 181 | 
 |  
| 2020 |   | 1,750 | 
 |  
| 2021 and thereafter |   | 17,845 | 
 |  
| Total |   | $ | 24,276 | 
 |  |