Segment Information (Assets by Reportable Segment) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Jun. 30, 2020
Segment Reporting Information [Line Items]
Total assets	$ 44,719	$ 40,766
Operating Segments | Pharmaceutical
Segment Reporting Information [Line Items]
Total assets	23,567	22,398
Operating Segments | Medical
Segment Reporting Information [Line Items]
Total assets	15,259	14,691
Corporate
Segment Reporting Information [Line Items]
Total assets	$ 5,893	$ 3,677