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Restructuring and Employee Severance (Liabilities Associated with Restructuring and Employee Severance Activities) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2016
Dec. 31, 2016
Restructuring Reserve [Roll Forward]    
Beginning Balance   $ 16
Additions $ 10  
Payments and other adjustments (10)  
Ending Balance 16 16
Employee- Related Costs    
Restructuring Reserve [Roll Forward]    
Beginning Balance   15
Additions   9
Payments and other adjustments   (9)
Ending Balance 15 15
Facility Exit and Other Costs    
Restructuring Reserve [Roll Forward]    
Beginning Balance   1
Additions   1
Payments and other adjustments   (1)
Ending Balance $ 1 $ 1