Basis of Presentation and Summary of Significant Accounting Policies (Revision of Consolidated Balance Sheet) (Details) - USD ($) shares in Thousands, $ in Millions	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cash and equivalents	$ 5,133	$ 4,076
Trade receivables, net	12,084	11,108
Inventories, net	14,957	16,119
Prepaid expenses and other	2,663	2,294
Assets held for sale	47	140
Total current assets	34,884	33,737
Property and equipment, net	2,529	2,461
Goodwill and other intangibles, net	6,450	6,085
Other assets	1,258	1,066
Total assets	45,121	43,349
Accounts payable	31,759	29,934
Other accrued liabilities	3,447	2,972
Total current liabilities	35,640	33,740
Deferred income taxes and other liabilities	8,035	8,657
Common shares, without par value	2,917	2,746
Accumulated deficit	(286)	(642)
Common shares in treasury, at cost: 83 million shares and 76 million shares at June 30, 2024 and 2023, respectively	(5,677)	(4,911)
Total Cardinal Health, Inc. shareholders' deficit	(3,213)	(2,958)
Total shareholders’ deficit	(3,212)	(2,957)	$ (882)	$ 1,623
Total liabilities and shareholders’ deficit	$ 45,121	$ 43,349
Common shares in treasury	83,000	76,000
As Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cash and equivalents		$ 4,043
Trade receivables, net		11,344
Inventories, net		15,940
Prepaid expenses and other		2,362
Assets held for sale		144
Total current assets		33,833
Property and equipment, net		2,462
Goodwill and other intangibles, net		6,081
Other assets		1,041
Total assets		43,417
Accounts payable		29,813
Other accrued liabilities		3,059
Total current liabilities		33,706
Deferred income taxes and other liabilities		8,653
Common shares, without par value		2,747
Accumulated deficit		(534)
Common shares in treasury, at cost: 83 million shares and 76 million shares at June 30, 2024 and 2023, respectively		(4,914)
Total Cardinal Health, Inc. shareholders' deficit		(2,852)
Total shareholders’ deficit		(2,851)	(706)	1,794
Total liabilities and shareholders’ deficit		43,417
Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cash and equivalents		33
Trade receivables, net		(236)
Inventories, net		179
Prepaid expenses and other		(68)
Assets held for sale		(4)
Total current assets		(96)
Property and equipment, net		(1)
Goodwill and other intangibles, net		4
Other assets		25
Total assets		(68)
Accounts payable		121
Other accrued liabilities		(87)
Total current liabilities		34
Deferred income taxes and other liabilities		4
Common shares, without par value		(1)
Accumulated deficit		(108)
Common shares in treasury, at cost: 83 million shares and 76 million shares at June 30, 2024 and 2023, respectively		3
Total Cardinal Health, Inc. shareholders' deficit		(106)
Total shareholders’ deficit		(106)	$ (176)	$ (171)
Total liabilities and shareholders’ deficit		$ (68)