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Restructuring and Employee Severance (Liabilities Associated with Restructuring and Employee Severance Activities) (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Restructuring Reserve [Roll Forward]    
Beginning Balance $ 41 $ 16
Additions 150 44
Payments and other adjustments (163) (19)
Ending Balance 28 41
Employee- Related Costs    
Restructuring Reserve [Roll Forward]    
Beginning Balance 41 15
Additions 19 43
Payments and other adjustments (36) (17)
Ending Balance 24 41
Facility Exit and Other Costs    
Restructuring Reserve [Roll Forward]    
Beginning Balance 0 1
Additions 131 1
Payments and other adjustments (127) (2)
Ending Balance $ 4 $ 0