Income Taxes (Narrative) (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	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2020
Income Taxes
Effective Income Tax Rate Reconciliation, Percent				58.90%	(21.20%)	(89.70%)
Goodwill, Impairment Loss				$ 1,231	$ 2,084
Income Tax Expense (Benefit)				$ 376	$ 163	$ (289)
Provision at Federal statutory rate				21.00%	21.00%	21.00%	28.00%	35.00%	35.00%	35.00%
Deferred income taxes and other liabilities	$ 8,653			$ 8,653	$ 9,299
Unrecognized tax benefits that would impact effective tax rate	873			873	858	$ 849
Effective Tax Rate Impact From Certain Foreign Jurisdictions				27
Undistributed Earnings of Foreign Subsidiaries	976			976
Deferred tax assets on tax credit carryforwards	(671)			(671)	(778)
Valuation allowance on operating loss carryforwards	(403)			(403)
Unrecognized tax benefits	1,010			1,010	943	932					$ 998
Unrecognized tax benefits, interest and penalties accrued	65			65	48	49
Medical
Income Taxes
Goodwill, Impairment Loss				1,231	2,084
Medical Unit
Income Taxes
Goodwill, Impairment Loss	368	$ 709	$ 154	1,200	2,100
Medical Unit | Medical
Income Taxes
Goodwill, Impairment Loss				(1,200)	(2,100)
Net Operating Loss Carryback
Income Taxes
Income Tax Expense (Benefit)						(424)
Income Taxes Receivable						974
Proceeds from Income Tax Refunds					966
Deferred income taxes and other liabilities						700
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	50			50
Federal
Income Taxes
Tax credit carryforwards	505			505
State and Local
Income Taxes
Tax credit carryforwards	3,400			3,400
Foreign
Income Taxes
Tax credit carryforwards	2,100			2,100
CareFusion [Member]
Income Taxes
Amount CareFusion is liable under tax matters agreement in the event amount must be paid to the taxing authority	$ 82			82	75
Total Opioid Litigation [Member]
Income Taxes
Income Tax Expense (Benefit)						(228)
Litigation Settlement, Expense						1,170
Unrecognized tax benefits that would impact effective tax rate						$ 219
Medical Unit Goodwill Impairment [Member]
Income Taxes
Income Tax Expense (Benefit)				$ (82)	$ (150)