Annual report pursuant to Section 13 and 15(d)

Stock-Based Incentive Compensation Plans (Details) (Stock Option Activities)

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Stock-Based Incentive Compensation Plans (Details) (Stock Option Activities) - Stock Options - $ / shares
shares in Millions
12 Months Ended
Dec. 26, 2015
Dec. 27, 2014
Dec. 28, 2013
Number of Options [Roll Forward]      
Stock options, shares outstanding at beginning of year 36 35 38
Stock options, shares granted 8 8 6
Stock options, shares cancelled (9) (4) (6)
Stock options, shares exercised (3) (3) (3)
Stock options, shares outstanding at end of year 32 36 35
Stock options, shares exercisable at end of year 21 23 22
Weighted Average Exercise Price [Roll Forward]      
Stock options, shares outstanding at beginning of year, weighted average exercise price $ 4.78 $ 5.08 $ 5.51
Stock options, shares granted, weighted average exercise price 2.12 3.73 3.63
Stock options, shares cancelled, weighted average exercise price 4.91 7.64 7.73
Stock options, shares exercised, weighted average exercise price 1.61 1.47 1.56
Stock options, shares outstanding at end of year, weighted average exercise price 4.44 4.78 5.08
Stock options, shares exercisable at end of year, weighted average exercise price $ 5.34 $ 5.28 $ 5.62