Shareholders' Equity (Changes in the Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 6,571	$ 6,256	$ 6,401
Total other comprehensive loss, net of tax		(93)	(93)
Total comprehensive net loss of tax of $9 million attributable to Cardinal Health, Inc.	(9)	(93)	(93)
Balance at end of period	6,828	6,571	6,256
Other comprehensive loss, tax	(9)	(6)
Foreign Currency Translation Adjustments and other
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(123)	(41)
Other comprehensive income/(loss), net before reclassifications	(25)	(82)
Amounts reclassified to earnings	0	0
Total other comprehensive loss, net of tax		(82)
Total comprehensive net loss of tax of $9 million attributable to Cardinal Health, Inc.	(25)
Balance at end of period	(148)	(123)	(41)
Unrealized Gain/(Loss) on Derivatives, net of tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	7	18
Other comprehensive income/(loss), net before reclassifications	19	(9)
Amounts reclassified to earnings	(3)	(2)
Total other comprehensive loss, net of tax		(11)
Total comprehensive net loss of tax of $9 million attributable to Cardinal Health, Inc.	16
Balance at end of period	23	7	18
Accumulated Other Comprehensive Income/(Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(116)	(23)	70
Other comprehensive income/(loss), net before reclassifications	(6)	(91)
Amounts reclassified to earnings	(3)	(2)
Total other comprehensive loss, net of tax		(93)
Total comprehensive net loss of tax of $9 million attributable to Cardinal Health, Inc.	(9)	(93)	(93)
Balance at end of period	$ (125)	$ (116)	$ (23)