Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Income Taxes
Effective Income Tax Rate Reconciliation, Percent		22.10%	213.80%	32.70%
Effective Tax Rate Impact From Certain Foreign Jurisdictions		$ 40
Provision at Federal statutory rate		21.00%	28.10%	35.00%
Federal		$ 28	$ 1,003	$ (258)
Deferred tax assets on tax credit carryforwards	$ (526)	(621)	(526)
Valuation allowance on operating loss carryforwards		524
Unrecognized tax benefits that would impact effective tax rate	262	303	262	268
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	141	39		23
Unrecognized tax benefits	423	456	423	417	$ 527
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	99	25		154
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	11	0		0
Unrecognized tax benefits, interest and penalties accrued	110	122	110	99
Unrecognized tax benefits, interest and penalties	8	8		$ 12
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Income Tax Expense		780	309
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		15
Federal
Income Taxes
Tax credit carryforwards		463
State and Local
Income Taxes
Tax credit carryforwards		2,700
Foreign
Income Taxes
Tax credit carryforwards		1,900
CareFusion [Member]
Income Taxes
Amount CareFusion is liable under tax matters agreement in the event amount must be paid to the taxing authority	151	165	151
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	$ 21	$ 22	$ 21