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Income Taxes Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Jun. 30, 2024
Jun. 30, 2024
Jun. 30, 2023
Income Taxes          
Benefit from income taxes $ (32) $ (1)      
Effective Income Tax Rate Reconciliation, Percent 122.50% (0.70%)      
Unrecognized tax benefits $ 998       $ 1,000
Unrecognized tax benefits that would impact effective tax rate 872       873
Unrecognized tax benefits, interest and penalties accrued 68       65
Goodwill impairment 581        
Medical Unit Goodwill Impairment [Member] | Subsequent Event          
Income Taxes          
Benefit from income taxes     $ 99    
Medical          
Income Taxes          
Goodwill impairment 581 $ 154      
Forecast [Member] | Medical          
Income Taxes          
Benefit from income taxes       $ (45)  
Minimum          
Income Taxes          
Estimated range of decrease in unrecognized tax benefits within the next 12 months 0        
Maximum          
Income Taxes          
Estimated range of decrease in unrecognized tax benefits within the next 12 months $ 51        
Federal | Minimum          
Income Taxes          
Open Tax Year 2015        
CareFusion [Member]          
Income Taxes          
Indemnification receivable $ 84       $ 82