Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Incentive Compensation Plans (Narrative) (Details)

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Stock-Based Incentive Compensation Plans (Narrative) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 24, 2016
Sep. 26, 2015
Sep. 24, 2016
Sep. 26, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Excess tax benefit related to stock-based compensation $ 0 $ 0 $ 0 $ 0
Stock options, shares granted 2,200,000 5,200,000 2,200,000 5,900,000
Stock options, shares granted, weighted average estimated grant date fair value per share (in usd per share) $ 3.10 $ 0.94 $ 3.10 $ 0.96
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock units, shares granted 19,500,000 25,000,000 26,000,000 33,900,000
Stock units, shares granted, weighted average grant date fair value (in usd per share) $ 5.10 $ 1.79 $ 4.55 $ 1.96
PRSUs with Market Conditions        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock units, shares granted 2,000,000 3,300,000 2,000,000 3,300,000
PRSUs without Market Conditions        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock units, shares granted       800,000
The 2016 PRSU Grants | PRSUs with Market Conditions        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compounded annual growth rate period 3 years      
Performance period 3 years      
Potential payout level 1 50.00%      
Potential payout level 2 100.00%      
Potential payout level 3 150.00%      
Potential payout level 4 200.00%      
Potential payout level 5 250.00%      
Stock units, shares outstanding 2,000,000   2,000,000  
Stock units, shares outstanding, weighted average grant date fair value (in usd per share) $ 4.50   $ 4.50  
The 2016 PRSU Grants | Certification of the attainment of the performance level | PRSUs with Market Conditions        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights, percentage 50.00%      
The 2016 PRSU Grants | Prior to first anniversary of the grant date | PRSUs with Market Conditions        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights (in shares) 0      
The 2016 PRSU Grants | End of the Performance Period | PRSUs with Market Conditions        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights, percentage 50.00%      
The 2015 PRSU Grants | PRSUs with Market Conditions        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compounded annual growth rate period   3 years    
Performance period   3 years    
Potential payout level 1   50.00%    
Potential payout level 2   100.00%    
Potential payout level 3   200.00%    
Potential payout level 4   250.00%    
Stock units, shares outstanding   3,300,000   3,300,000
Stock units, shares outstanding, weighted average grant date fair value (in usd per share)   $ 1.44   $ 1.44
Payout level achieved 250.00%   250.00%  
The 2015 PRSU Grants | Certification of the attainment of the performance level | PRSUs with Market Conditions        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights, percentage   50.00%    
The 2015 PRSU Grants | Prior to first anniversary of the grant date | PRSUs with Market Conditions        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights (in shares)   0    
The 2015 PRSU Grants | End of the Performance Period | PRSUs with Market Conditions        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights, percentage   50.00%