Segments of Business (Details) $ in Millions		3 Months Ended
	Jul. 01, 2020 numberOfSegments	Jun. 30, 2020 USD ($) country numberOfSegments	Jun. 30, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | numberOfSegments		3
Revenues
Total revenues		$ 55,679	$ 55,728
Segment operating profit (loss)
Total operating profit (loss)		678	634
Corporate expenses, net		(80)	(175)
Interest expense		(60)	(56)
Income from continuing operations before income taxes		645	619
Pre-tax credits related to LIFO accounting		52	15
Subsequent Event
Segment Reporting Information [Line Items]
Number of reportable segments | numberOfSegments	4
United States | Pension Plan
Segment operating profit (loss)
Corporate expenses, net			25
Pre-tax settlement expense			17
In re: National Prescription Opioid Litigation
Segment operating profit (loss)
Corporate expenses, net		(131)
United States
Revenues
Total revenues		47,129	46,321
Foreign
Revenues
Total revenues		8,550	9,407
Operating Segments
Revenues
Total revenues		55,679	55,728
Segment operating profit (loss)
Total operating profit (loss)		785	850
U.S. Pharmaceutical and Specialty Solutions
Segment operating profit (loss)
Pre-tax credits related to LIFO accounting		52	15
U.S. Pharmaceutical and Specialty Solutions | Operating Segments
Revenues
Total revenues		45,062	44,165
Segment operating profit (loss)
Total operating profit (loss)		$ 608	$ 579
Revenue derived from services, percentage (less than)		1.00%	1.00%
European Pharmaceutical Solutions
Segment Reporting Information [Line Items]
Number of countries in which entity segment operates | country		13
European Pharmaceutical Solutions | Operating Segments
Revenues
Total revenues		$ 6,246	$ 6,710
Segment operating profit (loss)
Total operating profit (loss)		$ (10)	$ 5
Revenue derived from services, percentage (less than)		10.00%	10.00%
Medical-Surgical Solutions | Operating Segments
Revenues
Total revenues		$ 1,801	$ 1,903
Segment operating profit (loss)
Total operating profit (loss)		$ 89	$ 125
Revenue derived from services, percentage (less than)		2.00%	2.00%
Other | Operating Segments
Revenues
Total revenues		$ 2,570	$ 2,950
Segment operating profit (loss)
Total operating profit (loss)		$ 98	$ 141