Annual report pursuant to Section 13 and 15(d)

Debt, Secured Revolving Facility and Secured Revolving Line of Credit (Details) (Narrative)

v3.19.3.a.u2
Debt, Secured Revolving Facility and Secured Revolving Line of Credit (Details) (Narrative)
$ / shares in Units, shares in Millions
12 Months Ended
Jun. 07, 2019
USD ($)
Sep. 14, 2016
USD ($)
day
$ / shares
Aug. 15, 2012
USD ($)
Dec. 28, 2019
USD ($)
$ / shares
shares
Dec. 29, 2018
USD ($)
$ / shares
Dec. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 27, 2014
USD ($)
Sep. 28, 2019
$ / shares
Jun. 16, 2014
USD ($)
Feb. 26, 2014
USD ($)
Debt Instrument [Line Items]                      
Conversion price (USD per share) | $ / shares   $ 8.00                  
Principal       $ 563,000,000 $ 1,528,000,000            
Stock issued in settlement       7,000,000 $ 141,000,000 $ 38,000,000          
Loss on the extinguishment of debt       $ 176,000,000              
6.75% Notes                      
Debt Instrument [Line Items]                      
Interest rate, stated percentage       6.75% 6.75% 6.75% 6.75%       6.75%
Principal                     $ 600,000,000
Repurchase partial tender offer             $ 442,000,000        
Repayments of debt           $ 26,000,000          
Stock issued in settlement           $ 5,000,000          
2.125% Notes                      
Debt Instrument [Line Items]                      
Interest rate, stated percentage   2.125%   2.125%         2.125%    
Principal   $ 805,000,000                  
Conversion price (USD per share) | $ / shares                 $ 8.00    
Principal       $ 251,000,000 $ 805,000,000            
Remaining term       6 years 9 months              
Debt instrument, convertible, stock price trigger (USD per share) | $ / shares       $ 46.18              
If-converted value in excess of principal       $ 1,200,000,000              
Effective interest rate       8.00%              
7.50% Notes                      
Debt Instrument [Line Items]                      
Interest rate, stated percentage     7.50% 7.50% 7.50% 7.50% 7.50% 7.50%      
Principal     $ 500,000,000                
Principal       $ 312,000,000 $ 337,000,000            
Extinguishment of debt       $ 25,000,000 $ 10,000,000 $ 3,000,000 $ 125,000,000 $ 25,000,000      
Repurchase partial tender offer             $ 135,000,000        
Repayments of debt, including accrued interest               $ 24,000,000      
Weighted average cost (USD per share) | $ / shares         $ 9.01            
7.00% Notes                      
Debt Instrument [Line Items]                      
Interest rate, stated percentage       7.00% 7.00% 7.00% 7.00%     7.00%  
Principal                   $ 500,000,000  
Principal       $ 0 $ 250,000,000            
Extinguishment of debt       $ 250,000,000 61,000,000 $ 105,000,000 $ 84,000,000        
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        
Weighted average cost (USD per share) | $ / shares         $ 9.42            
Debt Instrument, circumstance 1 | 7.50% Notes                      
Debt Instrument [Line Items]                      
Redemption price, percentage       100.00%              
Debt Instrument, circumstance 2 | 7.50% Notes                      
Debt Instrument [Line Items]                      
Redemption price, percentage     101.00%                
Secured Revolving Credit Facility                      
Debt Instrument [Line Items]                      
Debt instrument, covenant, maximum debt to EBITDA ratio 4.00                    
Debt instrument, covenant, minimum EBITDA to cash interest expense ratio 3.00                    
Letters of credit, outstanding balance       $ 14,000,000              
Repayments of lines of credit $ 70,000,000                    
6.75% Notes                      
Debt Instrument [Line Items]                      
Principal       0 $ 66,000,000            
Extinguishment of debt       $ 66,000,000 101,000,000 $ 30,000,000 $ 404,000,000        
Repayments of debt         14,000,000            
Stock issued in settlement         $ 87,000,000            
Weighted average cost (USD per share) | $ / shares         $ 9.04            
2.125% Notes                      
Debt Instrument [Line Items]                      
Interest rate, stated percentage       2.125%              
Principal       $ 251,000,000 $ 805,000,000            
Conversion price (USD per share) | $ / shares       $ 8.00              
Debt conversion, converted instrument, amount       $ 554,000,000              
Issuance of common stock to partially settle convertible debt | shares       69              
Repayments of convertible debt       $ 56,000,000              
Principal       251,000,000              
2.125% Notes | Convertible Debt                      
Debt Instrument [Line Items]                      
Payments of stock issuance cost       3,000,000              
2.125% Notes | 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% Notes | Debt Instrument, circumstance 2 | Convertible Debt                      
Debt Instrument [Line Items]                      
Threshold consecutive trading days | day   10                  
Threshold percentage of stock price trigger   98.00%                  
Conversion period after threshold period days | day   5                  
Threshold principal amount   $ 1,000                  
Swingline Subfacility | Secured Revolving Credit Facility                      
Debt Instrument [Line Items]                      
Secured revolving line of credit, maximum borrowing capacity 50,000,000                    
Secured Revolving Line of Credit                      
Debt Instrument [Line Items]                      
Principal       0 $ 70,000,000            
Secured Revolving Line of Credit | Secured Revolving Credit Facility                      
Debt Instrument [Line Items]                      
Secured revolving line of credit, maximum borrowing capacity 500,000,000                    
Debt instrument, available borrowings reduction, asset sales threshold 250,000,000                    
Long-term line of credit       $ 0              
Letter of Credit | Secured Revolving Credit Facility                      
Debt Instrument [Line Items]                      
Secured revolving line of credit, maximum borrowing capacity $ 75,000,000                    
Minimum | Secured Revolving Credit Facility | LIBOR                      
Debt Instrument [Line Items]                      
Basis spread on variable rate 1.00%                    
Minimum | Secured Revolving Credit Facility | Base Rate                      
Debt Instrument [Line Items]                      
Basis spread on variable rate 0.00%                    
Maximum | Secured Revolving Credit Facility | LIBOR                      
Debt Instrument [Line Items]                      
Basis spread on variable rate 1.75%                    
Maximum | Secured Revolving Credit Facility | Base Rate                      
Debt Instrument [Line Items]                      
Basis spread on variable rate 0.75%