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Fair Value Measurements (Fair Value of Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Jun. 30, 2017
Assets:    
Total available-for-sale securities   $ 65
Recurring    
Assets:    
Cash equivalents $ 1,162 739
Total available-for-sale securities 0 65
Other investments 116 116
Derivative Assets (Liabilities), at Fair Value, Net (21) (21)
Liabilities:    
Contingent Consideration (23) (32)
Recurring | Level 1    
Assets:    
Cash equivalents 1,162 739
Total available-for-sale securities 0 0
Other investments 116 116
Derivative Assets (Liabilities), at Fair Value, Net 0 0
Liabilities:    
Contingent Consideration 0 0
Recurring | Level 2    
Assets:    
Cash equivalents 0 0
Total available-for-sale securities 0 65
Other investments 0 0
Derivative Assets (Liabilities), at Fair Value, Net (21) (21)
Liabilities:    
Contingent Consideration 0 0
Recurring | Level 3    
Assets:    
Cash equivalents 0 0
Total available-for-sale securities 0 0
Other investments 0 0
Derivative Assets (Liabilities), at Fair Value, Net 0 0
Liabilities:    
Contingent Consideration $ (23) $ (32)