Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2020	Jun. 30, 2017
Income Taxes
Effective Income Tax Rate Reconciliation, Percent		2.10%	22.10%	213.80%
Income Tax Expense (Benefit)		$ (79)	$ 386	$ (487)
Effective Tax Rate Impact From Certain Foreign Jurisdictions		$ 17
Provision at Federal statutory rate		21.00%	21.00%	28.10%
Federal		$ 822	$ 28	$ 1,003
Deferred tax assets on tax credit carryforwards		(589)	(621)
Valuation allowance on operating loss carryforwards		461
Unrecognized tax benefits that would impact effective tax rate	$ 262	753	303	262
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	39	78		141
Unrecognized tax benefits	423	998	456	423		$ 417
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	25	6		99
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	0	3		11
Unrecognized tax benefits, interest and penalties accrued	110	146	122	110
Unrecognized tax benefits, interest and penalties	$ 8	16		8
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Income Tax Expense		800
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		370
Federal
Income Taxes
Tax credit carryforwards		123
State and Local
Income Taxes
Tax credit carryforwards		2,400
Foreign
Income Taxes
Tax credit carryforwards		2,200
Patient Recovery Business [Member]
Income Taxes
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions				110
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities				81
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations				$ 11
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		19	22
CareFusion [Member]
Income Taxes
Amount CareFusion is liable under tax matters agreement in the event amount must be paid to the taxing authority		176	$ 165
Total Opioid Litigation [Member]
Income Taxes
Estimated Litigation Liability					$ 5,630
Income Tax Expense (Benefit)		(488)
Unrecognized tax benefits that would impact effective tax rate		$ 469