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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2019
Jun. 30, 2019
Income Taxes            
Income Tax Expense (Benefit) $ 59 $ 126 $ (364) $ 269    
Unrecognized tax benefits 940   940     $ 456
Unrecognized tax benefits that would impact effective tax rate 791   791     303
Unrecognized tax benefits, interest and penalties accrued $ 132   $ 132     122
Effective Income Tax Rate Reconciliation, Percent 21.00% 31.00% 7.20% 23.50%    
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 $ 21   21     22
CareFusion [Member]            
Income Taxes            
Indemnification Receivable 171   171     $ 165
Total Opioid Litigation [Member]            
Income Taxes            
Estimated Litigation Liability 5,630   5,630   $ 5,630  
Income Tax Expense (Benefit)     (487)      
Unrecognized tax benefits that would impact effective tax rate $ 468   $ 468