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Segments of Business - Reportable operating segment (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Mar. 31, 2021
Segment revenues
Total revenues	$ 68,614	$ 62,599		$ 197,864	$ 179,086
Segment operating profit (loss)
Total operating profit (loss)	298	(7,362)		1,405	(6,050)
Corporate income (expenses), net	(195)	(8,246)		(858)	(8,462)
Loss on debt extinguishment	0	0		(191)	0
Interest expense	(41)	(55)		(135)	(165)
Income (loss) from continuing operations before income taxes	277	(7,363)		1,281	(6,063)
Pre-tax credits related to LIFO accounting				(79)	(115)
Charge for remeasurement to fair value				1,271	0
Restructuring, impairment, and related charges	18	40		208	156
Goodwill impairment charge	0	0		0	69
Net gain on settlement proceeds	(7)	(8,067)		(193)	(7,936)
Notes and Debentures Extinguished February 7 2018 | Term Loan
Segment operating profit (loss)
Loss on debt extinguishment				(191)
European Businesses (Disposal Group)
Segment operating profit (loss)
Charge for remeasurement to fair value				517
National Prescription Opioid Litigation
Segment operating profit (loss)
Pre-tax expenses related to estimated litigation liability				193		$ 8,100
Held-for-sale | U.K. Disposal Group (Disposal Group)
Segment operating profit (loss)
Charge for remeasurement to fair value	823			823
Held-for-sale | European Businesses (Disposal Group)
Segment operating profit (loss)
Charge for remeasurement to fair value	879			1,400
Held-for-sale | E.U. Businesses (Disposal Group)
Segment operating profit (loss)
Charge for remeasurement to fair value	26			517
Operating Segments
Segment operating profit (loss)
Total operating profit (loss)	513	938		2,465	2,564
Corporate
Segment operating profit (loss)
Restructuring, impairment, and related charges	9	20		90	60
Gains associated with equity investments		30		104	89
Corporate | National Prescription Opioid Litigation
Segment operating profit (loss)
Pre-tax expenses related to estimated litigation liability				193
Corporate | Held-for-sale | E.U. Businesses (Disposal Group)
Segment operating profit (loss)
Charge for remeasurement to fair value	(32)			117
National Prescription Opioid Litigation | Corporate
Segment operating profit (loss)
Pre-tax expenses related to estimated litigation liability		(8,100)			(8,100)
Litigation expense	33	34		104	118
Shareholder Derivative Action, Insurance Proceeds | Corporate
Segment operating profit (loss)
Net gain on settlement proceeds					131
U.S. Pharmaceutical
Segment revenues
Total revenues	55,041	49,495		158,471	142,232
U.S. Pharmaceutical | Operating Segments
Segment operating profit (loss)
Total operating profit (loss)	744	635		$ 2,186	1,871
Revenue derived from services, percentage (less than)				1.00%
Pre-tax credits related to LIFO accounting	33	11		$ 79	115
Restructuring, impairment, and related charges	3	6		25	18
U.S. Pharmaceutical | Operating Segments | New York Opioid Tax Surcharge
Segment operating profit (loss)
Charge recorded related to Company's share of the litigation settlement					50
U.S. Pharmaceutical | Antitrust Legal Settlements | Operating Segments
Segment operating profit (loss)
Company's shares of legal settlements				46
Prescription Technology Solutions
Segment revenues
Total revenues	1,031	777		2,844	2,101
Prescription Technology Solutions | Operating Segments
Segment operating profit (loss)
Total operating profit (loss)	129	114		$ 361	270
Revenue derived from services, percentage (less than)				40.00%
Restructuring, impairment, and related charges	0	0		$ 18	0
Medical-Surgical Solutions
Segment revenues
Total revenues	3,082	3,054		8,734	7,388
Medical-Surgical Solutions | Operating Segments
Segment operating profit (loss)
Total operating profit (loss)	308	260		$ 679	536
Revenue derived from services, percentage (less than)				4.00%
Inventory impairments and excess inventory		35		$ 164	49
Restructuring, impairment, and related charges	1	(2)		9	4
International (1)
Segment revenues
Total revenues	9,460	9,273		27,815	27,365
Segment operating profit (loss)
Restructuring, impairment, and related charges		131			189
Impairment, Long-Lived Asset, Held-for-Use		115			115
International (1) | Operating Segments
Segment operating profit (loss)
Total operating profit (loss)	(668)	(71)		$ (761)	(113)
Revenue derived from services, percentage (less than)				8.00%
Restructuring, impairment, and related charges	5	16		$ 66	74
Goodwill impairment charge			$ 69
International (1) | Operating Segments | Held-for-sale | U.K. Disposal Group (Disposal Group)
Segment operating profit (loss)
Charge for remeasurement to fair value	787			787
International (1) | Operating Segments | Held-for-sale | E.U. Businesses (Disposal Group)
Segment operating profit (loss)
Charge for remeasurement to fair value	$ 58			400
International (1) | Operating Segments | Disposed of by sale | Canadian Health Benefit Claims Management and Plan Administrative Services Business
Segment operating profit (loss)
Pre-tax gain on sale of business				$ 59
International (1) | Operating Segments | Contributed to Joint Venture | German Pharmaceutical Wholesale Business
Segment operating profit (loss)
Charge for remeasurement to fair value		$ 47			$ 57

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