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Shareholders' Equity (Changes in the Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
AOCI, Net of Tax [Roll Forward]        
Balance at beginning of period     $ 6,828  
Total other comprehensive income/(loss), net of tax $ (9) $ (54) 30 $ (54)
Balance at end of period 7,619   7,619  
Foreign Currency Translation Adjustments        
AOCI, Net of Tax [Roll Forward]        
Balance at beginning of period     (148)  
Other comprehensive income/(loss), before reclassifications     31  
Amounts reclassified to earnings     0  
Total other comprehensive income/(loss), net of tax     31  
Balance at end of period (117)   (117)  
Unrealized Gain/(Loss) on Derivatives, net of tax        
AOCI, Net of Tax [Roll Forward]        
Balance at beginning of period     23  
Other comprehensive income/(loss), before reclassifications     (1)  
Amounts reclassified to earnings     0  
Total other comprehensive income/(loss), net of tax     (1)  
Balance at end of period 22   22  
AOCI Attributable to Parent [Member]        
AOCI, Net of Tax [Roll Forward]        
Balance at beginning of period     (125)  
Accumulated Other Comprehensive Loss        
AOCI, Net of Tax [Roll Forward]        
Other comprehensive income/(loss), before reclassifications     30  
Amounts reclassified to earnings     0  
Total other comprehensive income/(loss), net of tax     30  
Balance at end of period $ (95)   $ (95)