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Shareholders' Equity (Changes in the Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
 3 Months Ended
Sep. 30, 2018
Sep. 30, 2017
AOCI, Net of Tax [Roll Forward]    
Balance at beginning of period $ 6,059  
Total other comprehensive income/(loss), net of tax (4) $ 39
Balance at end of period 5,913  
Foreign Currency Translation Adjustments    
AOCI, Net of Tax [Roll Forward]    
Balance at beginning of period (113)  
Other comprehensive income/(loss), before reclassifications (3)  
Amounts reclassified to earnings 0  
Total other comprehensive income/(loss), net of tax (3)  
Balance at end of period (116)  
Unrealized Gain/(Loss) on Derivatives, net of tax    
AOCI, Net of Tax [Roll Forward]    
Balance at beginning of period 21  
Other comprehensive income/(loss), before reclassifications 0  
Amounts reclassified to earnings (2)  
Total other comprehensive income/(loss), net of tax (2)  
Balance at end of period 19  
Accumulated Other Comprehensive Loss    
AOCI, Net of Tax [Roll Forward]    
Other comprehensive income/(loss), before reclassifications (3)  
Amounts reclassified to earnings (2)  
Total other comprehensive income/(loss), net of tax (5)  
AOCI Attributable to Parent [Member]    
AOCI, Net of Tax [Roll Forward]    
Balance at beginning of period (92)  
Balance at end of period $ (96)