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Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 35,349	$ 33,633	$ 35,186	$ 32,641	$ 32,966	$ 31,821	$ 33,150	$ 32,039	$ 136,809	$ 129,976	$ 121,546
Gross margin	1,735	1,913	1,861	1,672	1,623	1,728	1,602	1,590	7,181	6,544	6,543
Distribution, selling, general and administrative expenses	1,270	1,132	1,131	1,062	983	960	910	920	4,596	3,775	3,648
Net earnings	(1,166)	255	1,053	117	278	382	324	310	259	1,294	1,431
Less: Net earnings attributable to noncontrolling interests	0	0	0	2	4	1	0	1	(3)	(6)	(4)
Net earnings attributable to Cardinal Health, Inc.	$ (1,166)	$ 255	$ 1,053	$ 115	$ 274	$ 381	$ 324	$ 309	256	$ 1,288	$ 1,427
Net earnings/(loss) attributable to Cardinal Health, Inc. per common share:
Basic (in usd per share)	$ (3.76)	$ 0.81	$ 3.35	$ 0.36	$ 0.87	$ 1.21	$ 1.02	$ 0.97
Diluted (in usd per share)	$ (3.76)	$ 0.81	$ 3.33	$ 0.36	$ 0.86	$ 1.20	$ 1.02	$ 0.96
LIFO benefit/(charges)						$ 9	$ (9)
Goodwill and Intangible Assets [Line Items]
Goodwill, Impairment Loss									1,372
Medical
Goodwill and Intangible Assets [Line Items]
Goodwill, Impairment Loss	$ 1,372								$ 1,372

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