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Debt, Secured Revolving Facility and Secured Revolving Line of Credit (Narrative) (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 07, 2019
USD ($)
Sep. 30, 2016
USD ($)
day
Jun. 29, 2019
USD ($)
$ / shares
Mar. 30, 2019
USD ($)
Jun. 29, 2019
USD ($)
$ / shares
Jun. 30, 2018
USD ($)
Jun. 28, 2019
$ / shares
Dec. 29, 2018
USD ($)
Jun. 16, 2014
USD ($)
Feb. 26, 2014
USD ($)
Aug. 15, 2012
USD ($)
Debt Instrument [Line Items]                      
Aggregate principal amount repurchased         $ 164,000,000 $ 15,000,000          
Loss on debt redemption         $ 8,000,000 $ 1,000,000          
2.125% Convertible Senior Notes due 2026                      
Debt Instrument [Line Items]                      
Stated interest rate   2.125% 2.125%   2.125%            
Principal amount   $ 805,000,000 $ 805,000,000   $ 805,000,000     $ 805,000,000      
Outstanding aggregate principal amount     $ 805,000,000   $ 805,000,000            
Conversion price (in dollars per share) | $ / shares     $ 8.00   $ 8.00            
Remaining life         87 months            
Share price (in usd per share) | $ / shares             $ 30.37        
If-converted value in excess of principal     $ 2,251,000,000                
Effective interest rate     8.00%   8.00%            
2.125% Convertible Senior Notes due 2026 | Debt Instrument, circumstance 1                      
Debt Instrument [Line Items]                      
Threshold trading days | day   20                  
Threshold consecutive trading days | day   30                  
Threshold percentage of conversion price   130.00%                  
2.125% Convertible Senior Notes due 2026 | Debt Instrument, circumstance 2                      
Debt Instrument [Line Items]                      
Threshold consecutive trading days | day   10                  
Threshold percentage of conversion price   98.00%                  
Conversion period after threshold period days | day   5                  
6.75% Senior Notes due 2019                      
Debt Instrument [Line Items]                      
Stated interest rate                   6.75%  
Principal amount                   $ 600,000,000  
Aggregate principal amount repurchased       $ 66,000,000              
7.50% Senior Notes due 2022                      
Debt Instrument [Line Items]                      
Stated interest rate     7.50%   7.50%           7.50%
Principal amount                     $ 500,000,000
Outstanding aggregate principal amount     $ 312,000,000   $ 312,000,000            
Aggregate principal amount settled         $ 25,000,000            
7.00% Senior Notes due 2024                      
Debt Instrument [Line Items]                      
Stated interest rate     7.00%   7.00%       7.00%    
Principal amount                 $ 500,000,000    
Outstanding aggregate principal amount     $ 176,000,000   $ 176,000,000            
Aggregate principal amount repurchased         $ 74,000,000            
Secured Revolving Credit Facility                      
Debt Instrument [Line Items]                      
Maximum EBITDA debt to EBITDA ratio         4.00            
Minimum EBITDA to cash interest expense ratio         3.00            
Letters of credit outstanding, amount     14,000,000   $ 14,000,000            
Repayments of lines of credit $ 70,000,000                    
Secured Revolving Credit Facility | Secured Revolving Line of Credit                      
Debt Instrument [Line Items]                      
Maximum borrowing capacity $ 500,000,000                    
Debt instrument, term 5 years                    
Amount of assets sales that must be reinvested within twelve month period         250,000,000            
Long-term line of credit     $ 0   $ 0            
Secured Revolving Credit Facility | Swingline Subfacility                      
Debt Instrument [Line Items]                      
Maximum borrowing capacity $ 50,000,000                    
Secured Revolving Credit Facility | Letter of Credit                      
Debt Instrument [Line Items]                      
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%