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Subsequent Events (Details) - USD ($)
shares in Millions, $ in Billions
12 Months Ended
Oct. 24, 2018
Oct. 02, 2018
Sep. 30, 2018
Subsequent Event [Member]      
Subsequent Event [Line Items]      
Stock Repurchased and Retired During Period, Shares   72.0  
Revolving Credit Facility [Member] | threehundredsixtyfourdaycreditfacility [Member]      
Subsequent Event [Line Items]      
Maturity date of credit facility     Oct. 25, 2018
Revolving Credit Facility [Member] | threehundredsixtyfourdaycreditfacility [Member] | Subsequent Event [Member]      
Subsequent Event [Line Items]      
Unsecured revolving credit facility $ 1.0    
Maturity date of credit facility Oct. 23, 2019    
Repurchase Agreements [Member] | Subsequent Event [Member]      
Subsequent Event [Line Items]      
Accelerated Share Repurchases, Settlement (Payment) or Receipt   $ 5.0