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Segment Information (Narrative) (Details)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Dec. 31, 2023
USD ($)
segment
Dec. 31, 2022
USD ($)
Segment Reporting Information [Line Items]          
Project costs on investment and other spending $ 14 $ 5   $ 20 $ 11
Number of reportable segments | segment       2  
Number of operating segments | segment       2  
Goodwill impairment       $ 581  
Number of operating segments | segment       2  
Number of reportable segments | segment       2  
Project costs on investment and other spending $ 14 5   $ 20 11
Medical Unit          
Segment Reporting Information [Line Items]          
Goodwill impairment       581 $ 863
Medical          
Segment Reporting Information [Line Items]          
Goodwill impairment   $ 709 $ 154 $ 581