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Acquisitions Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Jul. 29, 2017
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Business Acquisition [Line Items]        
Goodwill   $ 8,319   $ 8,316
Cash paid for acquisitions, net of cash acquired   0 $ 6,139  
Patient Recovery Business [Member]        
Business Acquisition [Line Items]        
Goodwill   3,300    
Cash paid for acquisitions, net of cash acquired $ 6,100      
Transaction and integration costs   $ 22 $ 37