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Equity (Narrative) (Details)
$ / shares in Units, TangibleEquityUnits in Millions, TEUPurchaseContracts in Millions
 6 Months Ended 12 Months Ended 18 Months Ended
Mar. 15, 2017
$ / shares
Apr. 01, 2017
USD ($)
TangibleEquityUnits
shares
$ / shares
Sep. 27, 2014
USD ($)
TangibleEquityUnits
$ / shares
Apr. 01, 2017
USD ($)
TangibleEquityUnits
TEUPurchaseContracts
$ / shares
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 | $   $ 35,000,000 205,000,000 $ 35,000,000 $ 71,000,000
Tangible Equity Units, Purchase Contracts, Settled | TEUPurchaseContracts       21.7  
Tangible Equity Units, Outstanding | TangibleEquityUnits   8.3   8.3  
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]          
Stock Issued During Period, Value, Conversion of Convertible Securities       23,100,000  
Common Stock, Dividends, Per Share, Cash Paid | $ / shares $ 0.225        
Class A [Member] | Convertible Debt [Member] | Tangible Equity Unit, Senior Amortizing Note [Member]          
Class of Stock [Line Items]          
Senior amortizing note, conversion price | $ / shares   $ 46.69   $ 46.69  
Senior amortizing note, number of shares per contract if applicable market value equal to or greater than conversion price   1.0710      
Senior amortizing note, reference price | $ / shares   $ 37.35   37.35  
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   1.3389      
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   2,200,000      
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   8,900,000      
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   11,100,000      
Class A [Member] | Share Repurchase Program [Member]          
Class of Stock [Line Items]          
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased   29,100,000   29,100,000