Basis of Presentation and Summary of Significant Accounting Policies (Revision of Consolidated Statements of Earnings (Loss)) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended						12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue	$ 54,868	$ 57,442	$ 54,650	$ 50,498	$ 51,468	$ 49,592	$ 226,827	$ 204,979	$ 181,326
Cost of products sold	52,933	55,588	52,907	48,688	49,784	47,996	219,413	198,105	174,842
Gross margin	1,935	1,854	1,743	1,810	1,684	1,596	7,414	6,874	6,484
Distribution, selling, general and administrative expenses	1,269	1,268	1,186	1,172	1,179	1,195	5,000	4,800	4,512
Impairments and (gain)/loss on disposal of assets, net	84	1	541				634	1,246	2,060
Litigation (recoveries)/charges, net	80	(11)	(41)	(76)	(207)	25	78	(304)	94
Operating earnings/(loss)	369	505	(32)	604	(86)	123	1,243	752	(607)
Other (income)/expense, net	(1)	(10)	1	2	(6)	3	(9)	5	22
Interest expense, net	28	3	11	26	24	24	51	84	147
Earnings/(loss) before income taxes	342	512	(44)	576	(104)	96	1,201	663	(784)
Provision for/(benefit from) income taxes	80	143	(33)	209	(27)	(3)	348	332	153
Net earnings/(loss)	262	369	(11)	367	(77)	99	853	331	(937)
Net earnings/(loss) attributable to Cardinal Health, Inc.	$ 261	$ 368	$ (12)	$ 365	$ (77)	$ 98	$ 852	$ 330	$ (938)
Basic (in dollars per share)	$ 1.07	$ 1.50	$ (0.05)	$ 1.43	$ (0.30)	$ 0.36	$ 3.48	$ 1.27	$ (3.37)
Diluted (in dollars per share)	$ 1.07	$ 1.50	$ (0.05)	$ 1.41	$ (0.30)	$ 0.36	$ 3.45	$ 1.26	$ (3.37)
As Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue	$ 54,911	$ 57,445	$ 54,763	$ 50,487	$ 51,469	$ 49,603		$ 205,012	$ 181,364
Cost of products sold	52,964	55,599	52,995	48,702	49,806	47,989		198,123	174,819
Gross margin	1,947	1,846	1,768	1,785	1,663	1,614		6,889	6,545
Distribution, selling, general and administrative expenses	1,282	1,283	1,197	1,179	1,191	1,197		4,834	4,557
Impairments and (gain)/loss on disposal of assets, net	84	1	537					1,250	2,050
Litigation (recoveries)/charges, net	81	(11)	(41)	(76)	(207)	27		(302)	109
Operating earnings/(loss)	367	482	(14)	572	(119)	137		727	(596)
Other (income)/expense, net	(7)	(16)	(2)	0	(7)	2		(4)	16
Interest expense, net	33	8	14	28	25	25		93	149
Earnings/(loss) before income taxes	341	490	(26)	544	(137)	110		638	(769)
Provision for/(benefit from) income taxes	82	136	(32)	197	(7)	(1)		376	163
Net earnings/(loss)	259	354	6	347	(130)	111		262	(932)
Net earnings/(loss) attributable to Cardinal Health, Inc.	$ 258	$ 353	$ 5	$ 345	$ (130)	$ 110		$ 261	$ (933)
Basic (in dollars per share)	$ 1.06	$ 1.44	$ 0.02	$ 1.35	$ (0.50)	$ 0.41		$ 1.00	$ (3.35)
Diluted (in dollars per share)	$ 1.05	$ 1.43	$ 0.02	$ 1.34	$ (0.50)	$ 0.40		$ 1.00	$ (3.35)
Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue	$ (43)	$ (3)	$ (113)	$ 11	$ (1)	$ (11)		$ (33)	$ (38)
Cost of products sold	(31)	(11)	(88)	(14)	(22)	7		(18)	23
Gross margin	(12)	8	(25)	25	21	(18)		(15)	(61)
Distribution, selling, general and administrative expenses	(13)	(15)	(11)	(7)	(12)	(2)		(34)	(45)
Impairments and (gain)/loss on disposal of assets, net	0	0	4					(4)	10
Litigation (recoveries)/charges, net	(1)	0	0	0	0	(2)		(2)	(15)
Operating earnings/(loss)	2	23	(18)	32	33	(14)		25	(11)
Other (income)/expense, net	6	6	3	2	1	1		9	6
Interest expense, net	(5)	(5)	(3)	(2)	(1)	(1)		(9)	(2)
Earnings/(loss) before income taxes	1	22	(18)	32	33	(14)		25	(15)
Provision for/(benefit from) income taxes	(2)	7	(1)	12	(20)	(2)		(44)	(10)
Net earnings/(loss)	3	15	(17)	20	53	(12)		69	(5)
Net earnings/(loss) attributable to Cardinal Health, Inc.	$ 3	$ 15	$ (17)	$ 20	$ 53	$ (12)		$ 69	$ (5)
Basic (in dollars per share)	$ 0.01	$ 0.06	$ (0.07)	$ 0.08	$ 0.20	$ (0.05)		$ 0.27	$ (0.02)
Diluted (in dollars per share)	$ 0.02	$ 0.07	$ (0.07)	$ 0.07	$ 0.20	$ (0.04)		$ 0.26	$ (0.02)