Document and Entity Information - USD ($)	12 Months Ended
	Jun. 30, 2019	Jul. 31, 2019	Dec. 31, 2018
Document and Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Jun. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Entity Registrant Name	CARDINAL HEALTH INC
Entity Central Index Key	0000721371
Current Fiscal Year End Date	--06-30
Entity Current Reporting Status	Yes
Entity Well-Known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity Public Float			$ 13,267,580,148
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		298,133,678