Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Mar. 31, 2018	Jun. 30, 2017	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Jun. 30, 2018
Income Taxes
Remeasurement Deferred Tax Assets and Liabilities expense (benefit)	$ 18
Foreign income, transition tax				$ 41
Unrecognized tax benefits	426	$ 417		426
Unrecognized tax benefits that would impact effective tax rate	264	268		264
Unrecognized tax benefits, interest and penalties accrued	106	99		106
Amount CareFusion is liable under tax matters agreement in the event amount must be paid to the taxing authority	$ 148	$ 142		$ 148
Effective Income Tax Rate Reconciliation, Percent	45.10%		32.30%	(48.60%)	34.40%
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount	$ 18		$ 31
Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Deferred Tax Asset, Income Tax Expense (Benefit)	(18)			$ (952)
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	$ 35			35
Federal | Minimum
Income Taxes
Closed tax year		2006
Tax years open for examination	2008
Federal | Maximum
Income Taxes
Closed tax year		2007
Tax years open for examination		2018
State and Local | Minimum
Income Taxes
Tax years open for examination	2008
State and Local | Maximum
Income Taxes
Tax years open for examination		2018
Foreign | Minimum
Income Taxes
Tax years open for examination	2008
Foreign | Maximum
Income Taxes
Tax years open for examination		2018
Scenario, Forecast
Income Taxes
Federal statutory rate						28.10%
Patient Recovery Business
Income Taxes
Business Combination, Indemnification Receivable	$ 34			34
Disposal Group, Held-for-sale, Not Discontinued Operations | China Business
Income Taxes
Provisional tax expense, disposal group				$ 57