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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Jun. 30, 2019
Income Taxes          
Income Tax Expense (Benefit) $ 127 $ 74 $ (237) $ 342  
Unrecognized tax benefits 919   919   $ 456
Unrecognized tax benefits that would impact effective tax rate 772   772   303
Unrecognized tax benefits, interest and penalties accrued $ 137   $ 137   122
Effective Income Tax Rate Reconciliation, Percent 26.80% 20.00% 5.20% 22.60%  
Minimum          
Income Taxes          
Estimated range of decrease in unrecognized tax benefits within the next 12 months $ 0   $ 0    
Maximum          
Income Taxes          
Estimated range of decrease in unrecognized tax benefits within the next 12 months $ 350   350    
Internal Revenue Service (IRS) [Member] | Minimum          
Income Taxes          
Open Tax Year 2008        
Patient Recovery Business          
Income Taxes          
Indemnification Receivable $ 18   18   22
CareFusion [Member]          
Income Taxes          
Indemnification Receivable 173   173   $ 165
Total Opioid Litigation [Member]          
Income Taxes          
Estimated Litigation Liability 5,630   5,630    
Income Tax Expense (Benefit)     (487)    
Unrecognized tax benefits that would impact effective tax rate $ 468   $ 468