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Segment Information (Narrative) (Details)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2020
USD ($)
segment
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Segment Reporting Information [Line Items]            
Number of Reportable Segments | segment       2    
Number of Operating Segments | segment       2    
Pre-Tax Gain on Divestiture       $ 508    
Gain (Loss) Related to Litigation Settlement       (5,741) $ (36) $ (159)
Project costs on investment and other spending       69 55 $ 43
naviHealth [Member]            
Segment Reporting Information [Line Items]            
Gain on Divestiture After Tax $ 493   $ 378      
Pre-Tax Gain on Divestiture     $ 508   $ 508  
Sterile Surgical Gown Recall [Member]            
Segment Reporting Information [Line Items]            
Inventory Recall Expense       $ 85    
Total Opioid Litigation [Member]            
Segment Reporting Information [Line Items]            
Gain (Loss) Related to Litigation Settlement   $ (5,630)