Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 37,353	$ 35,228	$ 37,740	$ 35,213	$ 35,349	$ 33,633	$ 35,186	$ 32,641	$ 145,534	$ 136,809	$ 129,976
Gross margin	1,674	1,764	1,730	1,667	1,735	1,913	1,861	1,672	6,834	7,181	6,544
Distribution, selling, general and administrative expenses	1,168	1,097	1,064	1,155	1,270	1,132	1,131	1,062	4,480	4,596	3,775
Net earnings	194	296	281	594	(1,166)	255	1,053	117	1,365	259	1,294
Less: Net earnings attributable to noncontrolling interests	0	0	1	1	0	0	0	2	(2)	(3)	(6)
Net earnings attributable to Cardinal Health, Inc.	$ 194	$ 296	$ 280	$ 593	$ (1,166)	$ 255	$ 1,053	$ 115	1,363	256	$ 1,288
Net earnings attributable to Cardinal Health, Inc. per common share:
Basic (in usd per share)	$ 0.65	$ 0.99	$ 0.94	$ 1.95	$ (3.76)	$ 0.81	$ 3.35	$ 0.36
Diluted (in usd per share)	$ 0.65	$ 0.99	$ 0.93	$ 1.94	$ (3.76)	$ 0.81	$ 3.33	$ 0.36
Goodwill and Intangible Assets [Line Items]
Pre-Tax Gain on Divestiture									508
Goodwill, Impairment Loss										1,372
Medical
Goodwill and Intangible Assets [Line Items]
Goodwill, Impairment Loss					$ 1,372					1,372
naviHealth [Member]
Goodwill and Intangible Assets [Line Items]
Pre-Tax Gain on Divestiture									508
Gain on Divestiture After Tax									$ 378
Goodwill, Impairment Loss										$ 509