Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net earnings	$ 259	$ 1,294	$ 1,431
Other comprehensive income/(loss):
Foreign currency translation adjustments and other	58	(25)	(82)
Amounts reclassified to earnings	(23)	0	0
Net unrealized gain/(loss) on derivative instruments, net of tax	(2)	16	(11)
Total other comprehensive income/(loss), net of tax	33	(9)	(93)
Total comprehensive income	292	1,285	1,338
Net Income (Loss) Attributable to Noncontrolling Interest	3	6	4
Total comprehensive income attributable to Cardinal Health, Inc.	$ 289	$ 1,279	$ 1,334