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Segment Information (Narrative) (Details)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
segment
Dec. 31, 2018
USD ($)
Sep. 30, 2019
USD ($)
Segment Reporting Information [Line Items]          
Number of operating segments | segment     2    
Number of reportable segments | segment     2    
Project costs on investment and other spending $ 17 $ 12 $ 20 $ 19  
naviHealth [Member]          
Segment Reporting Information [Line Items]          
Pre-Tax Gain on Divestiture       $ 508  
Total Opioid Litigation [Member]          
Segment Reporting Information [Line Items]          
Estimated Litigation Liability 5,630   5,630   $ 5,630
Sterile Surgical Gown Recall [Member] [Domain]          
Segment Reporting Information [Line Items]          
Inventory Recall Expense $ 96   $ 96