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Segments of Business - Reportable operating segment (Details) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 30, 2024 USD ($) segment	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) segment	Sep. 30, 2023 USD ($)	Mar. 31, 2024 USD ($)
Segment revenues
Total revenues	$ 93,651	$ 77,215	$ 172,934	$ 151,698
Segment operating profit (loss)
Total operating profit (loss)	578	951	1,607	2,051
Subtotal	861	1,141	2,123	2,483
Corporate income (expenses), net	(249)	(164)	(352)	(368)
Interest expense	(78)	(61)	(153)	(108)
Income before income taxes	534	916	$ 1,618	2,007
Number of reportable segments | segment			4
Accounts receivable, credit loss expense (reversal)			$ (169)	243
Proceeds from legal settlements	63
Pre-tax credits related to LIFO accounting			(4)	87
Restructuring, impairment, and related charges, net	234	28	244	80
Income (loss) from equity method investments			(43)
Restructuring charges	149	10	148	12
Canadian businesses held for sale			638	0
Gains (losses) associated with equity investments	(15)	0	95	0
Canadian retail disposal group | Held-for-sale
Segment operating profit (loss)
Canadian businesses held for sale	643		643
Strategic Growth Initiative Plan - Operational Efficiencies and Cost Optimization
Segment operating profit (loss)
Restructuring, impairment, and related charges, net	$ 227	3	227	39
Rx Savings Solutions, LLC
Segment operating profit (loss)
Fair value adjustment gain		48		76
United States
Segment operating profit (loss)
Number of reportable segments | segment	3
Corporate
Segment operating profit (loss)
Restructuring, impairment, and related charges, net	$ 23	6	24	46
Restructuring charges	4	0	3	1
Gains (losses) associated with equity investments			95
Corporate | Canadian retail disposal group
Segment operating profit (loss)
Other comprehensive loss	50		50
Corporate | National Prescription Opioid Litigation
Segment operating profit (loss)
Pre-tax expenses related to estimated litigation liability			51
U.S. Pharmaceutical
Segment revenues
Total revenues	85,726	69,766	157,441	136,926
Segment operating profit (loss)
Total operating profit (loss)	1,075	593	1,856	1,420
Accounts receivable, credit loss expense (reversal)	203	210	203	210	$ 725
Proceeds from legal settlements	63	79	153	197
U.S. Pharmaceutical | Operating Segments
Segment operating profit (loss)
Pre-tax credits related to LIFO accounting	(2)	55	(4)	87
Restructuring, impairment, and related charges, net	64	9	65	11
Restructuring charges	1	8	1	9
U.S. Pharmaceutical | Operating Segments | Restructuring Initiatives QTD
Segment operating profit (loss)
Restructuring, impairment, and related charges, net	64		64
U.S. Pharmaceutical | Operating Segments | National Prescription Opioid Litigation
Segment operating profit (loss)
Pre-tax expenses related to estimated litigation liability			57
Prescription Technology Solutions
Segment revenues
Total revenues	1,265	1,140	2,506	2,384
Segment operating profit (loss)
Total operating profit (loss)	205	238	408	469
Prescription Technology Solutions | Operating Segments
Segment operating profit (loss)
Restructuring, impairment, and related charges, net	1	3	5	5
Restructuring charges	0	0	0	0
Medical-Surgical Solutions
Segment revenues
Total revenues	2,948	2,834	5,584	5,445
Segment operating profit (loss)
Total operating profit (loss)	89	244	277	471
Medical-Surgical Solutions | Operating Segments
Segment operating profit (loss)
Restructuring, impairment, and related charges, net	147	4	150	6
Restructuring charges	144	0	144	0
International
Segment revenues
Total revenues	3,709	3,475	7,400	6,943
Segment operating profit (loss)
Total operating profit (loss)	(508)	66	(418)	123
International | Canadian retail disposal group | Held-for-sale
Segment operating profit (loss)
Canadian businesses held for sale	593		593
International | Operating Segments
Segment operating profit (loss)
Restructuring, impairment, and related charges, net	(1)	6	0	12
Restructuring charges	0	2	0	2
Corporate
Segment revenues
Total revenues	$ 3	$ 0	$ 3	$ 0
Revenue from Contract with Customer, Product and Service Benchmark | Product Concentration Risk | U.S. Pharmaceutical
Segment operating profit (loss)
Revenue derived from services, percentage (approximately or less than)	1.00%
Revenue from Contract with Customer, Product and Service Benchmark | Product Concentration Risk | Prescription Technology Solutions
Segment operating profit (loss)
Revenue derived from services, percentage (approximately or less than)	40.00%
Revenue from Contract with Customer, Product and Service Benchmark | Product Concentration Risk | Medical-Surgical Solutions
Segment operating profit (loss)
Revenue derived from services, percentage (approximately or less than)	1.00%
Revenue from Contract with Customer, Product and Service Benchmark | Product Concentration Risk | International
Segment operating profit (loss)
Revenue derived from services, percentage (approximately or less than)	1.00%

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