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Fair Value Measurements (Fair Value of Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Jun. 30, 2017
Jun. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets held for sale $ 2,216 $ 0  
Liabilities related to assets held for sale 1,339 0  
Assets:      
Total available-for-sale securities     $ 65
Recurring      
Assets:      
Cash equivalents 0 739  
Forward contracts (33) (21)  
Total available-for-sale securities 0 65  
Other investments 122 116  
Liabilities:      
Contingent Consideration (21) (32)  
Recurring | Level 1      
Assets:      
Cash equivalents 0 739  
Forward contracts 0 0  
Total available-for-sale securities 0 0  
Other investments 122 116  
Liabilities:      
Contingent Consideration 0 0  
Recurring | Level 2      
Assets:      
Cash equivalents 0 0  
Forward contracts (33) (21)  
Total available-for-sale securities 0 65  
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   $ (32)  
Disposal Group, Held-for-sale, Not Discontinued Operations | China Business      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets held for sale 2,216    
Liabilities related to assets held for sale $ 1,339