Document and Entity Information - USD ($)	12 Months Ended
	Jun. 30, 2017	Jul. 31, 2017	Dec. 31, 2016
Document and Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Trading Symbol	cah
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 Public Float			$ 22,624,332,824
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		316,453,664