Annual report pursuant to Section 13 and 15(d)

Significant Accounting Policies (Details) (Net Loss Per Share)

v3.6.0.2
Significant Accounting Policies (Details) (Net Loss Per Share) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Mar. 07, 2014
Dec. 31, 2016
Sep. 24, 2016
Jun. 25, 2016
Mar. 26, 2016
Dec. 26, 2015
Sep. 26, 2015
Jun. 27, 2015
Mar. 28, 2015
Dec. 31, 2016
Dec. 26, 2015
Dec. 27, 2014
Numerator—Net loss:                        
Net loss                   $ (497) $ (660) $ (403)
Denominator—Weighted-average shares:                        
Denominator for basic and diluted net loss per share (shares)                   835,000,000 783,000,000 768,000,000
Net loss per share                        
Basic (USD per share)   $ (0.06) $ (0.50) $ 0.09 $ (0.14) $ (0.13) $ (0.25) $ (0.23) $ (0.23) $ (0.60) $ (0.84) $ (0.53)
Diluted (USD per share)   $ (0.06) $ (0.50) $ 0.08 $ (0.14) $ (0.13) $ (0.25) $ (0.23) $ (0.23) $ (0.60) $ (0.84) $ (0.53)
Stock Compensation Plan                        
Net loss per share                        
Antidilutive securities excluded from computation of earnings per share                   231,000,000 52,000,000 48,000,000
2.125% Convertible Senior Notes Due 2026                        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                        
Interest rate, stated percentage   2.125%               2.125%    
WCH Warrant                        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                        
Common stock issued by exercise of warrants (shares) 35,000,000                      
Shares issuable by warrants (shares) 35,000,000                      
Warrant exercise price (USD per share) $ 0.01                      
Warrants outstanding (shares)   0               0