Segment Information (Assets by Reportable Segment) (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Total assets	$ 43,417			$ 43,417	$ 43,878	$ 44,453
Assets held for sale	144			144	0
Goodwill, Impairment Loss				1,231	2,084
Goodwill, Impairment Loss				1,231	2,084
Medical Unit
Segment Reporting Information [Line Items]
Goodwill, Impairment Loss	368	$ 709	$ 154	1,200	2,100
Goodwill, Impairment Loss	368	$ 709	$ 154	1,200	2,100
Pharmaceutical
Segment Reporting Information [Line Items]
Goodwill, Impairment Loss				0
Goodwill, Impairment Loss				0
Medical
Segment Reporting Information [Line Items]
Goodwill, Impairment Loss				1,231	2,084
Goodwill, Impairment Loss				1,231	2,084
Medical | Medical Unit
Segment Reporting Information [Line Items]
Goodwill, Impairment Loss				(1,200)	(2,100)
Goodwill, Impairment Loss				(1,200)	(2,100)
Medical | Cordis Divestiture
Segment Reporting Information [Line Items]
Assets held for sale						1,100
Operating Segments | Pharmaceutical
Segment Reporting Information [Line Items]
Total assets	28,077			28,077	26,409	23,624
Operating Segments | Medical
Segment Reporting Information [Line Items]
Total assets	10,130			10,130	11,632	15,408
Corporate
Segment Reporting Information [Line Items]
Total assets	$ 5,210			$ 5,210	$ 5,837	$ 5,421