Annual report pursuant to Section 13 and 15(d)

Debt and Other Obligations (Details) (Narrative)

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Debt and Other Obligations (Details) (Narrative)
12 Months Ended
Sep. 14, 2016
USD ($)
day
$ / shares
Apr. 14, 2015
USD ($)
Jun. 16, 2014
USD ($)
Feb. 26, 2014
USD ($)
Aug. 15, 2012
USD ($)
Dec. 29, 2018
USD ($)
$ / shares
Dec. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 27, 2014
USD ($)
Dec. 28, 2018
$ / shares
Sep. 30, 2016
USD ($)
Sep. 24, 2016
$ / shares
Debt Instrument [Line Items]                        
Loss on the extinguishment of debt           $ 12,000,000            
Conversion price (USD per share) | $ / shares $ 8.00                      
Remaining term           93 months            
Share price (USD per share) | $ / shares                       $ 6.00
Principal           $ 1,458,000,000            
Stock issued in settlement [1]           141,000,000 $ 38,000,000 $ 8,000,000        
Short-term debt [2]           136,000,000 70,000,000          
Secured Revolving Line of Credit                        
Debt Instrument [Line Items]                        
Short-term debt           70,000,000 $ 70,000,000          
Letters of credit, outstanding balance           26,000,000            
Secured revolving line of credit, remaining borrowing capacity           $ 175,000,000            
6.75% Senior Notes due 2019                        
Debt Instrument [Line Items]                        
Interest rate, stated percentage       6.75%   6.75% 6.75%          
Repurchase partial tender offer               442,000,000        
Principal amount, at time of issuance       $ 600,000,000                
Principal             $ 166,000,000          
Repayments of debt             26,000,000          
Stock issued in settlement             $ 5,000,000          
2.125% Convertible Senior Notes Due 2026                        
Debt Instrument [Line Items]                        
Interest rate, stated percentage 2.125%         2.125% 2.125%          
Principal amount, at time of issuance $ 805,000,000                      
Share price (USD per share) | $ / shares                   $ 17.82    
If-converted value in excess of principal           $ 988,000,000            
Effective interest rate           8.00%            
Principal           $ 805,000,000 $ 805,000,000          
7.50% Senior Notes due 2022                        
Debt Instrument [Line Items]                        
Interest rate, stated percentage         7.50% 7.50% 7.50%          
weighted average cost | $ / shares           $ 9.01            
Repurchase partial tender offer               135,000,000        
Principal amount, at time of issuance         $ 500,000,000              
Extinguishment of debt           $ 10,000,000 $ 3,000,000 125,000,000 $ 25,000,000      
Principal           $ 337,000,000 $ 347,000,000          
Repayments of debt, including accrued interest               24,000,000        
7.00% Senior Notes due 2024                        
Debt Instrument [Line Items]                        
Interest rate, stated percentage     7.00%     7.00% 7.00%          
weighted average cost | $ / shares           $ 9.42            
Principal amount, at time of issuance     $ 500,000,000                  
Extinguishment of debt           $ 61,000,000 $ 105,000,000 84,000,000        
Principal           250,000,000 311,000,000          
Repayments of debt           26,000,000 84,000,000 77,000,000        
Stock issued in settlement           $ 35,000,000 26,000,000 8,000,000        
Debt Instrument, circumstance 1 | 6.75% Senior Notes due 2019                        
Debt Instrument [Line Items]                        
Redemption price, percentage       100.00%                
Debt Instrument, circumstance 1 | 7.50% Senior Notes due 2022                        
Debt Instrument [Line Items]                        
Redemption price, percentage         100.00%              
Debt Instrument, circumstance 1 | 7.00% Senior Notes due 2024                        
Debt Instrument [Line Items]                        
Redemption price, percentage     100.00%                  
Debt Instrument, circumstance 2 | 6.75% Senior Notes due 2019                        
Debt Instrument [Line Items]                        
Redemption price, percentage       101.00%                
Debt Instrument, circumstance 2 | 7.50% Senior Notes due 2022                        
Debt Instrument [Line Items]                        
Redemption price, percentage         101.00%              
Debt Instrument, circumstance 2 | 7.00% Senior Notes due 2024                        
Debt Instrument [Line Items]                        
Redemption price, percentage     101.00%                  
6.75% Senior Notes due 2019                        
Debt Instrument [Line Items]                        
weighted average cost | $ / shares           $ 9.04            
Extinguishment of debt           $ 101,000,000 30,000,000 $ 404,000,000        
Principal           66,000,000            
Repayments of debt           14,000,000            
Stock issued in settlement           $ 87,000,000            
2.125% Convertible Senior Notes Due 2026                        
Debt Instrument [Line Items]                        
Interest rate, stated percentage                     2.125%  
Principal                     $ 805,000,000  
2.125% Convertible Senior Notes Due 2026 | Convertible Debt                        
Debt Instrument [Line Items]                        
Payments of stock issuance cost             $ 9,000,000          
2.125% Convertible Senior Notes Due 2026 | Debt Instrument, circumstance 1 | Convertible Debt                        
Debt Instrument [Line Items]                        
Convertible, threshold trading days | day 20                      
Threshold consecutive trading days | day 30                      
Threshold percentage of stock price trigger 130.00%                      
2.125% Convertible Senior Notes Due 2026 | Debt Instrument, circumstance 2 | Convertible Debt                        
Debt Instrument [Line Items]                        
Threshold consecutive trading days | day 10                      
Threshold principal amount $ 1,000                      
Conversion period after threshold period days | day 5                      
Threshold percentage of stock price trigger 98.00%                      
Secured Revolving Line of Credit                        
Debt Instrument [Line Items]                        
Secured revolving line of credit, interest rate at period end           6.00% 4.75%          
Secured Revolving Line of Credit | Amended and restated loan and security agreement                        
Debt Instrument [Line Items]                        
Secured revolving line of credit, maximum borrowing capacity   $ 500,000,000                    
Letters of credit, maximum borrowing capacity   45,000,000                    
Maximum commitments   $ 200,000,000                    
Secured Revolving Line of Credit | Federal Funds | Amended and restated loan and security agreement                        
Debt Instrument [Line Items]                        
Basis spread on variable rate   0.50%                    
Secured Revolving Line of Credit | LIBOR | Amended and restated loan and security agreement                        
Debt Instrument [Line Items]                        
Basis spread on variable rate   1.00%                    
[1] Prior year amounts adjusted to reflect the retrospective application of ASU 2014-09, Revenue from Contracts with Customers, ASU 2016-15, Statement of Cash Flows: Classification of Certain Cash Receipts and Cash Payments and ASU 2016-18, Statement of Cash Flows: Restricted Cash. Refer to Note 2.
[2] Prior year amounts adjusted to reflect the retrospective application of ASU 2014-09, Revenue from Contracts with Customers. Refer to Note 2.