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Equity Equity (Narrative) (Details)
$ / shares in Units, shares in Millions, TangibleEquityUnits in Millions, TEUPurchaseContracts in Millions
 12 Months Ended 21 Months Ended
Jul. 17, 2017
USD ($)
shares
Sep. 27, 2014
USD ($)
TangibleEquityUnits
$ / shares
Jul. 01, 2017
USD ($)
TangibleEquityUnits
TEUPurchaseContracts
shares
Oct. 01, 2016
USD ($)
Class of Stock [Line Items]        
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   $ 205,000,000 $ 18,000,000 $ 71,000,000
Tangible Equity Units, Purchase Contracts, Settled | TEUPurchaseContracts     22.8  
Tangible Equity Units, Outstanding | TangibleEquityUnits     7.2  
Subsequent Event [Member] | Convertible Debt [Member] | Tangible Equity Unit, Senior Amortizing Note [Member]        
Class of Stock [Line Items]        
Debt Instrument, Period Payment, Per Senior Amortizing Note $ 0.59      
Debt Instrument, Periodic Payment $ 18,000,000      
Class A [Member]        
Class of Stock [Line Items]        
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | shares     27.8  
Stock Issued During Period, Value, Conversion of Convertible Securities | shares     24.2  
Class A [Member] | Subsequent Event [Member]        
Class of Stock [Line Items]        
Stock Issued During Period, Value, Conversion of Convertible Securities | shares 7.8