Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 32,966	$ 31,821	$ 33,150	$ 32,039	$ 31,384	$ 30,662	$ 31,445	$ 28,055	$ 129,976	$ 121,546	$ 102,531
Gross margin	1,623	1,728	1,602	1,590	1,665	1,689	1,609	1,579	6,544	6,543	5,712
Distribution, selling, general and administrative expenses	983	960	910	920	970	914	922	842	3,775	3,648	3,240
Earnings from continuing operations		382	324	310	335	386	326	384	1,294	1,431	1,212
Earnings from discontinued operations, net of tax	0	0	0	0	0	0	0	0	0	0	3
Net earnings	278	382	324	310	335	386	326	384	1,294	1,431	1,215
Less: Net earnings attributable to noncontrolling interests	4	1	0	1	2	0	0	1	$ (6)	(4)	0
Net earnings attributable to Cardinal Health, Inc.	$ 274	$ 381	$ 324	$ 309	$ 333	$ 386	$ 326	$ 383		$ 1,427	$ 1,215
Net earnings from continuing operations attributable to Cardinal Health, Inc. per common share:
Basic (in usd per share)	$ 0.87	$ 1.21	$ 1.02	$ 0.97	$ 1.03	$ 1.18	$ 0.99	$ 1.17	$ 4.06	$ 4.36	$ 3.65
Diluted (in usd per share)	$ 0.86	$ 1.20	$ 1.02	$ 0.96	$ 1.02	$ 1.17	$ 0.98	$ 1.15	$ 4.03	$ 4.32	$ 3.61
LIFO benefit/(charges)		$ (9)	$ 9		$ 51	$ (12)	$ (39)