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Shareholders' Equity (Narrative) (Details)
$ / shares in Units, $ in Millions
 12 Months Ended 36 Months Ended
Jun. 30, 2022
USD ($)
$ / shares
shares
Jun. 30, 2021
USD ($)
$ / shares
shares
Jun. 30, 2020
USD ($)
$ / shares
shares
Jun. 30, 2022
USD ($)
shares
Class of Stock [Line Items]        
Treasury Stock, Value, Acquired, Cost Method | $ $ 1,000 $ 200 $ 350  
Payments for Repurchase of Common Stock | $ 1,000 200 350  
Retained earnings decrease | $ $ 280 $ (1,205)   $ 280
Common shares, authorized 755,000,000 755,000,000   755,000,000
Common Class A        
Class of Stock [Line Items]        
Common shares, authorized 750,000,000     750,000,000
Common Stock, Voting Rights, Votes 1      
Common Class B        
Class of Stock [Line Items]        
Common shares, authorized 5,000,000     5,000,000
Treasury Shares        
Class of Stock [Line Items]        
Treasury Stock, Value, Acquired, Cost Method | $ $ 1,000 $ 200 $ 350  
Treasury Stock, Shares, Acquired 19,500,000 3,700,000 7,300,000  
Payments for Repurchase of Common Stock | $       $ 1,600
Treasury shares acquired, average price per share (in usd per share) | $ / shares   $ 54.40 $ 48.00  
Treasury Shares | $200 million share repurchase program [Member]        
Class of Stock [Line Items]        
Treasury Stock, Shares, Acquired 3,600,000      
Treasury shares acquired, average price per share (in usd per share) | $ / shares $ 56.02      
Treasury Shares | $300 million share repurchase program [Member]        
Class of Stock [Line Items]        
Treasury Stock, Shares, Acquired 6,100,000      
Treasury shares acquired, average price per share (in usd per share) | $ / shares $ 49.39      
Treasury Shares | $500 million share repurchase program [Member]        
Class of Stock [Line Items]        
Treasury Stock, Shares, Acquired 9,800,000      
Treasury shares acquired, average price per share (in usd per share) | $ / shares $ 51.10