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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]        
Reclassified to assets held for sale     $ (387)  
Other Intangible Assets Reclassified to Assets Held for Sales $ 61      
Amortization of intangible assets 152 $ 95 287 $ 196
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 289   289  
Estimated annual amortization of intangible assets - Year Two 553   553  
Estimated annual amortization of intangible assets - Year Three 522   522  
Estimated annual amortization of intangible assets - Year Four 450   450  
Estimated annual amortization of intangible assets - Year Five 417   417  
Pharmaceutical        
Finite-Lived Intangible Assets [Line Items]        
Reclassified to assets held for sale $ 387   $ (333)