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Fair Value Measurements (Fair Value of Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Jun. 30, 2016
Assets:    
Total available-for-sale securities   $ 200
Recurring    
Assets:    
Cash equivalents $ 52 516
Forward contracts 11 19
Total available-for-sale securities 201 200
Other investments 112 103
Liabilities:    
Contingent Consideration (21) (19)
Recurring | Level 1    
Assets:    
Cash equivalents 52 516
Forward contracts 0 0
Total available-for-sale securities 0 0
Other investments 112 103
Liabilities:    
Contingent Consideration 0 0
Recurring | Level 2    
Assets:    
Cash equivalents 0 0
Forward contracts 11 19
Total available-for-sale securities 201 200
Other investments 0 0
Liabilities:    
Contingent Consideration 0 0
Recurring | Level 3    
Assets:    
Cash equivalents 0 0
Forward contracts 0 0
Total available-for-sale securities 0 0
Other investments 0 0
Liabilities:    
Contingent Consideration $ (21) $ (19)