Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Income Taxes
Effective Income Tax Rate Reconciliation, Percent		(89.70%)	2.10%	22.10%
Income Tax Expense (Benefit)		$ (289)	$ (79)	$ 386
Effective Tax Rate Impact From Certain Foreign Jurisdictions		$ 20
Provision at Federal statutory rate		21.00%	21.00%	21.00%
Federal		$ (539)	$ 822	$ 28
Deferred tax assets on tax credit carryforwards		(805)	(589)
Valuation allowance on operating loss carryforwards		477
Unrecognized tax benefits that would impact effective tax rate	$ 303	849	753	303
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions		223	78	39
Unrecognized tax benefits	456	932	998	456	$ 423
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities		271	6	25
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations		1	3	0
Unrecognized tax benefits, interest and penalties accrued	122	49	146	122
Unrecognized tax benefits, interest and penalties	$ 16			$ 8
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Income Tax Expense		825
Deferred income taxes and other liabilities		9,670	8,594
Net Operating Loss Carryback
Income Taxes
Income Tax Expense (Benefit)		(424)
Income Taxes Receivable		974
Deferred income taxes and other liabilities		700
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		20
Federal
Income Taxes
Tax credit carryforwards		272
State and Local
Income Taxes
Tax credit carryforwards		3,900
Foreign
Income Taxes
Tax credit carryforwards		2,300
Patient Recovery Business [Member]
Income Taxes
Amount CareFusion is liable under tax matters agreement in the event amount must be paid to the taxing authority		12	19
CareFusion [Member]
Income Taxes
Amount CareFusion is liable under tax matters agreement in the event amount must be paid to the taxing authority		72	176
Total Opioid Litigation [Member]
Income Taxes
Estimated Litigation Liability		6,730
Income Tax Expense (Benefit)		228	488
Unrecognized tax benefits that would impact effective tax rate		219	469
Litigation Settlement, Expense		$ 1,170	$ 5,630