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Equity (Narrative) (Details)
$ / shares in Units, TangibleEquityUnits in Millions, TEUPurchaseContracts in Millions
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 15, 2016
$ / shares
Aug. 05, 2016
USD ($)
shares
Jul. 02, 2016
USD ($)
TangibleEquityUnits
$ / shares
shares
Jun. 27, 2015
USD ($)
shares
Jul. 02, 2016
USD ($)
TangibleEquityUnits
shares
TEUPurchaseContracts
$ / shares
Jun. 27, 2015
USD ($)
shares
Sep. 27, 2014
USD ($)
TangibleEquityUnits
$ / shares
Feb. 04, 2016
shares
Oct. 03, 2015
USD ($)
Class of Stock [Line Items]                  
Payments for Repurchase of Common Stock | $         $ 1,293,000,000 $ 197,000,000      
TEU's issued (in units) | TangibleEquityUnits             30.0    
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 | $     $ 88,000,000   $ 88,000,000   205,000,000   $ 140,000,000
Tangible Equity Units, Purchase Contracts, Settled | TEUPurchaseContracts         16.2        
Tangible Equity Units, Outstanding | TangibleEquityUnits     13.8   13.8        
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 | $     $ 467,000,000 $ 47,000,000 $ 1,293,000,000 $ 197,000,000      
Treasury Stock, Shares, Acquired     7,200,000 1,100,000 23,200,000 4,800,000      
Stock Issued During Period, Value, Conversion of Convertible Securities         17,200,000        
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     $ 46.95   $ 46.95        
Senior amortizing note, number of shares per contract if applicable market value equal to or greater than conversion price         1.0649        
Senior amortizing note, reference price | $ / shares     37.56   $ 37.56        
Senior amortizing note, if applicable market value greater than reference price, number of shares equal to amount divided by Applicable Market Value | $ / shares     $ 50   $ 50        
Senior amortizing note, number of shares per contract, if Applicable Market Value is less than or equal to reference price         1.3313        
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         3,700,000        
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         14,700,000        
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         18,400,000        
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  
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased     49,100,000   49,100,000        
Payments for Repurchase of Common Stock | $     $ 457,000,000 $ 37,000,000 $ 1,235,000,000 $ 168,000,000      
Treasury Stock, Shares, Acquired     7,100,000 900,000 22,000,000 4,200,000      
Class A [Member] | Subsequent Event [Member] | Share Repurchase Program [Member]                  
Class of Stock [Line Items]                  
Payments for Repurchase of Common Stock | $   $ 380,000,000              
Treasury Stock, Shares, Acquired   5,400,000