Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
Common Stock and Stock-Based Incentive Compensation Plans (Details) (Narrative) - USD ($)
3 Months Ended 12 Months Ended
Sep. 24, 2016
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
Dec. 29, 2017
Dec. 27, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock, par value (USD per share) $ 0.01 $ 0.01 $ 0.01      
Share price (USD per share) $ 6.00       $ 10.28  
Proceeds from issuance of common stock, net of issuance costs $ 667,000,000 $ 0 $ 667,000,000 $ 0    
Payments of stock issuance costs $ 23,000,000          
Common stock, shares outstanding   967,000,000 935,000,000      
Vesting period   3 years        
Expiration period   10 years        
Excess tax benefits from stock-based compensation   $ 0   0    
Shares available for grant (shares)   49,000,000        
Stock-based compensation expense   $ 97,000,000 $ 86,000,000 $ 63,000,000    
Common Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Issuance of common stock, net of issuance costs (shares) 115,000,000   115,000,000      
Common stock, shares outstanding   967,000,000 935,000,000 792,000,000   776,000,000
Stock Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock options, shares granted, weighted average estimated grant date fair value per share (USD per share)   $ 5.46 $ 3.10 $ 1.02    
Expected dividend payments   0.00% 0.00% 0.00%    
Stock options, shares outstanding, weighted average remaining contractual life   3 years 8 months 30 days        
Stock options, shares outstanding, aggregate intrinsic value   $ 104,000,000        
Stock options, shares exercisable, aggregate intrinsic value   $ 87,000,000        
Stock options, shares exercisable, weighted average remaining contractual life   3 years 3 months 17 days        
Stock options, shares exercised, total intrinsic value   $ 27,000,000 $ 10,000,000 $ 2,000,000    
Stock options, total unrecognized compensation expense, net of estimated forfeitures   $ 9,000,000        
Weighted-average period expected for recognition   1 year 5 months 5 days        
Purchase price of common stock   100.00%        
Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Restricted stock units, shares purchased, weighted average price per share (USD per share)   $ 0.00        
Weighted-average period expected for recognition   1 year 6 months 17 days        
Restricted stock units, shares vested, total fair value   $ 328,000,000 151,000,000 33,000,000    
Restricted stock units, share-based compensation expense   93,000,000 $ 80,000,000 $ 57,000,000    
Restricted stock units, total unrecognized compensation expense, net of estimated forfeitures   $ 184,000,000        
Restricted stock units, shares granted (shares)   12,000,000 29,000,000 38,000,000    
Weighted-average grant date fair value (usd per share)   $ 6.60 $ 3.73 $ 2.61   $ 4.05
Performance-based Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share price (USD per share)   $ 12.83 $ 5.14      
Expected dividend payments   0.00% 0.00% 0.00%    
Restricted stock units, shares granted (shares)   2,000,000 5,000,000 5,000,000    
Weighted-average grant date fair value (usd per share)   $ 17.18 $ 9.00      
Performance-based Restricted Stock Units | Senior Executives            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Restricted stock units, shares granted (shares)   800,000 2,000,000 3,900,000    
Performance-based Restricted Stock Units | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share price (USD per share)       $ 1.85    
Range of target shares granted   0.00%        
Weighted-average grant date fair value (usd per share)       0.85    
Performance-based Restricted Stock Units | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share price (USD per share)       1.99    
Range of target shares granted   250.00%        
Weighted-average grant date fair value (usd per share)       $ 0.91    
ESPP            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Expected dividend payments   0.00%        
Maximum percent of earnings withheld during offering period   10.00%        
Purchase price of common stock   85.00%        
Offering period   6 months        
Shares available for issuance (shares)   50,000,000        
Weighted-average grant date fair value (usd per share)   $ 3.46        
Stock-based compensation expense   $ 2,300,000        
Employee Stock Options and Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares available for issuance (shares)   52,000,000