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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, 2017
Jun. 30, 2016
Restructuring Reserve [Roll Forward]    
Beginning Balance $ 16 $ 22
Additions 44 19
Payments and other adjustments (19) (25)
Ending Balance 41 16
Employee- Related Costs    
Restructuring Reserve [Roll Forward]    
Beginning Balance 15 22
Additions 43 17
Payments and other adjustments (17) (24)
Ending Balance 41 15
Facility Exit and Other Costs    
Restructuring Reserve [Roll Forward]    
Beginning Balance 1 0
Additions 1 2
Payments and other adjustments (2) (1)
Ending Balance $ 0 $ 1