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Equity (Narrative) (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 15, 2015
$ / shares
Feb. 04, 2016
USD ($)
shares
Jan. 02, 2016
USD ($)
shares
$ / shares
Dec. 27, 2014
USD ($)
shares
Sep. 27, 2014
USD ($)
$ / shares
shares
Oct. 03, 2015
USD ($)
Class of Stock [Line Items]            
Payments for Repurchase of Common Stock | $     $ 387,000,000 $ 91,000,000    
TEU's issued (in units)         30,000,000  
TEU's Dividend Rate         4.75%  
Proceeds from Issuance of Tangible Equity Units, Net | $         $ 1,454,000,000  
TEUs, stated amount per unit (in dollars per unit) | $ / shares         $ 50  
TEUs, Equity Component | $         $ 1,295,000,000  
TEUs, Debt Component | $     123,000,000   205,000,000 $ 140,000,000
Convertible Debt [Member] | Tangible Equity Unit, Senior Amortizing Note [Member]            
Class of Stock [Line Items]            
Senior amortizing note, initial principal amount | $         $ 6.83  
Senior amortizing note, interest rate         1.50%  
Senior amortizing note, quarterly principal and interest payment | $         $ 0.59  
Class A [Member]            
Class of Stock [Line Items]            
Payments for Repurchase of Common Stock | $     $ 387,000,000 $ 91,000,000    
Treasury Stock, Shares, Acquired     8,300,000 2,200,000    
Common Stock, Dividends, Per Share, Cash Paid | $ / shares $ 0.15          
Class A [Member] | Convertible Debt [Member] | Tangible Equity Unit, Senior Amortizing Note [Member]            
Class of Stock [Line Items]            
Senior amortizing note, conversion price | $ / shares     $ 47.06      
Senior amortizing note, number of shares per contract if applicable market value equal to or greater than conversion price     1.0624      
Senior amortizing note, reference price | $ / shares     $ 37.65      
Senior amortizing note, if applicable market value greater than reference price, number of shares equal to amount divided by Applicable Market Value | $ / shares     $ 50      
Senior amortizing note, number of shares per contract, if Applicable Market Value is less than or equal to reference price     1.3282      
Senior amortizing note, consecutive trading days for calculation of applicable market value     20 days      
Debt Instrument, Convertible, Dividend Threshold Amount | $ / shares     $ 0.075      
Senior amortizing note, incremental common shares attributable to dilutive effect of conversion, if applicable market value higher than reference price     8,000,000      
Class A [Member] | Convertible Debt [Member] | Tangible Equity Unit, Senior Amortizing Note [Member] | Minimum [Member]            
Class of Stock [Line Items]            
Senior amortizing note, number of shares to be issued     31,900,000      
Class A [Member] | Convertible Debt [Member] | Tangible Equity Unit, Senior Amortizing Note [Member] | Maximum [Member]            
Class of Stock [Line Items]            
Senior amortizing note, number of shares to be issued     39,800,000      
Class A [Member] | Share Repurchase Program [Member]            
Class of Stock [Line Items]            
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased     13,500,000      
Payments for Repurchase of Common Stock | $     $ 357,000,000 $ 81,000,000    
Treasury Stock, Shares, Acquired     7,600,000 2,000,000    
Subsequent Event [Member] | Class A [Member] | Share Repurchase Program [Member]            
Class of Stock [Line Items]            
Stock Repurchase Program, Number of Shares Authorized to be Repurchased   50,000,000        
Payments for Repurchase of Common Stock | $   $ 221,000,000        
Treasury Stock, Shares, Acquired   4,300,000