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Segments of Business - Reportable operating segment (Details) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 31, 2022 USD ($)	Sep. 30, 2023 USD ($) segment	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) segment	Sep. 30, 2022 USD ($)
Segment revenues
Total revenues		$ 77,215	$ 70,157	$ 151,698	$ 137,311
Segment operating profit (loss)
Total operating profit (loss)		951	1,124	2,051	2,160
Subtotal		1,141	1,278	2,483	2,368
Corporate income (expenses), net		(164)	21	(368)	(18)
Interest expense		(61)	(55)	(108)	(100)
Income from continuing operations before income taxes		916	1,244	$ 2,007	2,250
Number of reportable segments | segment				4
Accounts receivable, credit loss expense (reversal)		210		$ 210
Proceeds from legal settlements		79		197
Pre-tax credits related to LIFO accounting				(87)	36
Fair value adjustment gain		48		76
Loss (gain) to remeasure disposal group to fair value				0	(35)
Restructuring costs, anticipated total charges		$ 28	30	80	53
United States
Segment operating profit (loss)
Number of reportable segments | segment		3
Corporate
Segment operating profit (loss)
Restructuring costs, anticipated total charges		$ 6	10	46	19
Corporate | Held-for-sale | E.U. Businesses (Disposal Group)
Segment operating profit (loss)
Loss (gain) to remeasure disposal group to fair value			(166)		(272)
U.S. Pharmaceutical
Segment revenues
Total revenues		69,766	60,059	136,926	117,006
Segment operating profit (loss)
Total operating profit (loss)		$ 593	896	1,420	1,592
U.S. Pharmaceutical | Revenue from Contract with Customer, Product and Service Benchmark | Product Concentration Risk
Segment operating profit (loss)
Revenue derived from services, percentage (approximately or less than)		1.00%
U.S. Pharmaceutical | Operating Segments
Segment operating profit (loss)
Pre-tax credits related to LIFO accounting		$ (55)	23	(87)	36
Gain from sale of equity method investment		142		142
Proceeds from sale of equity securities	$ 179
Restructuring costs, anticipated total charges		9	3	11	7
Prescription Technology Solutions
Segment revenues
Total revenues		1,140	1,018	2,384	2,084
Segment operating profit (loss)
Total operating profit (loss)		$ 238	120	469	264
Prescription Technology Solutions | Revenue from Contract with Customer, Product and Service Benchmark | Product Concentration Risk
Segment operating profit (loss)
Revenue derived from services, percentage (approximately or less than)		40.00%
Prescription Technology Solutions | Operating Segments
Segment operating profit (loss)
Restructuring costs, anticipated total charges		$ 3	7	5	14
Medical-Surgical Solutions
Segment revenues
Total revenues		2,834	2,843	5,445	5,435
Segment operating profit (loss)
Total operating profit (loss)		$ 244	299	471	555
Medical-Surgical Solutions | Revenue from Contract with Customer, Product and Service Benchmark | Product Concentration Risk
Segment operating profit (loss)
Revenue derived from services, percentage (approximately or less than)		2.00%
Medical-Surgical Solutions | Operating Segments
Segment operating profit (loss)
Restructuring costs, anticipated total charges		$ 4	1	6	2
International
Segment revenues
Total revenues		3,475	6,237	6,943	12,786
Segment operating profit (loss)
Total operating profit (loss)		$ 66	(37)	123	(43)
International | Revenue from Contract with Customer, Product and Service Benchmark | Product Concentration Risk
Segment operating profit (loss)
Revenue derived from services, percentage (approximately or less than)		1.00%
International | Operating Segments
Segment operating profit (loss)
Restructuring costs, anticipated total charges		$ 6	9	$ 12	11
International | Operating Segments | Held-for-sale | E.U. Businesses (Disposal Group)
Segment operating profit (loss)
Loss (gain) to remeasure disposal group to fair value			$ 143		$ 237

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