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Shareholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Class of Stock [Line Items]      
Payments for Repurchase of Common Stock   $ 600 $ 0
Treasury Stock, Shares, Retired 37.0    
Treasury Stock, Common, Value $ (2,500)    
Common Stock, Shares, Outstanding 302    
Retained earnings $ 2,200    
Treasury Shares      
Class of Stock [Line Items]      
Treasury shares acquired (using cost method), shares   8.1  
Treasury shares acquired, average price per share (in usd per share)   $ 74.08