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Fair Value Measurements (Fair Value of Assets and Liabilities Measured on a Recurring Basis) (Details) - Recurring - USD ($)
$ in Millions
Dec. 31, 2019
Jun. 30, 2019
Assets:    
Cash equivalents $ 199  
Other investments 116 $ 118
Forward contracts 73 53
Level 1    
Assets:    
Cash equivalents 199  
Other investments 116 118
Forward contracts 0 0
Level 2    
Assets:    
Cash equivalents 0  
Other investments 0 0
Forward contracts 73 53
Level 3    
Assets:    
Cash equivalents 0  
Other investments 0 0
Forward contracts $ 0 $ 0