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Shareholders' Equity (Narrative) (Details)
$ / shares in Units, $ in Millions
 12 Months Ended 36 Months Ended
Jun. 30, 2017
USD ($)
$ / shares
shares
Jun. 30, 2016
USD ($)
$ / shares
shares
Jun. 30, 2015
USD ($)
$ / shares
shares
Jun. 30, 2016
USD ($)
shares
Class of Stock [Line Items]        
Common shares, authorized | shares 755,000,000 755,000,000   755,000,000
Preferred shares, authorized | shares 500,000 500,000   500,000
Treasury shares acquired (using cost method), value | $ $ 600 $ 651 $ 1,036  
Payments for Repurchase of Common Stock | $ $ 600 651 1,036  
Retirement of Treasury Shares (in shares) | shares 37,000,000      
Retained earnings decrease | $ $ (4,967) (6,419)   $ (6,419)
Treasury Shares        
Class of Stock [Line Items]        
Treasury shares acquired (using cost method), value | $ $ 600 $ 651 $ 1,036 $ 2,300
Treasury shares acquired (using cost method), shares | shares 8,100,000 8,200,000 13,100,000  
Treasury shares acquired, average price per share (in usd per share) | $ / shares $ 74.08 $ 78.98 $ 79.02  
Retirement of Treasury Shares (in shares) | shares 37,000,000      
Common Class A        
Class of Stock [Line Items]        
Common shares, authorized | shares 750,000,000 750,000,000   750,000,000
Common Stock, Voting Rights, Votes 1      
Common Class B        
Class of Stock [Line Items]        
Common shares, authorized | shares 5,000,000 5,000,000   5,000,000
Common Stock, Voting Rights, Votes 0.2      
Retirement of Treasury Shares [Member]        
Class of Stock [Line Items]        
Decrease in Common Shares in Treasury | $ $ 2,500      
Decrease in Common Shares, Value | $ 302      
Retained earnings decrease | $ $ 2,200