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Earnings per Share (EPS) and Common Stock (Narrative) (Details) - USD ($)
6 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Apr. 20, 2018
Sep. 30, 2017
Earnings Per Share and Common Stock        
Stock option restricted shares and restricted stock units excluded from computation of EPS, shares 0 1,800,000    
Common stock, shares authorized 500,000,000     500,000,000
Stock Repurchase Program, Authorized Amount $ 500,000,000      
Subsequent Event [Member]        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Accelerated Share Repurchases, Settlement (Payment) or Receipt     $ 100,000,000