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Segments of Business - Schedule Of Segment Information (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Revenues
Total Revenues	$ 48,713	$ 50,130	$ 49,957	$ 49,733	$ 46,678	$ 47,899	$ 48,761	$ 47,546	$ 198,533	$ 190,884	$ 179,045
Operating profit
Operating income									7,109	3,545	2,968
Interest Expense									(308)	(353)	(374)
Income from Continuing Operations Before Income Taxes									6,891	3,250	2,657
Depreciation and amortization
Total									910	885	1,017
Expenditures for long-lived assets
Total									404	488	376
United States
Revenues
Total Revenues									164,428	158,255	142,810
Foreign
Revenues
Total Revenues									34,105	32,629	36,235
Operating Segments
Revenues
Total Revenues									198,533	190,884	179,045
Operating profit
Operating income									7,576	4,072	3,485
Operating Segments | Distribution Solutions
Revenues
Total Revenues									195,923	187,999	175,976
Operating profit
Operating income									3,361	3,553	3,047
Depreciation and amortization
Total									735	669	750
Expenditures for long-lived assets
Total									276	306	301
Operating Segments | Distribution Solutions | Reportable Subsegments | North America pharmaceutical distribution and services
Revenues
Total Revenues									164,832	158,469	143,711
Operating Segments | Distribution Solutions | Reportable Subsegments | International pharmaceutical distribution and services
Revenues
Total Revenues									24,847	23,497	26,358
Operating Segments | Distribution Solutions | Reportable Subsegments | Medical-Surgical distribution and services
Revenues
Total Revenues									6,244	6,033	5,907
Operating Segments | Technology Solutions
Revenues
Total Revenues									2,610	2,885	3,069
Operating profit
Operating income									4,215	519	438
Depreciation and amortization
Total									65	107	156
Expenditures for long-lived assets
Total									30	15	27
Segment Reconciling Items
Operating profit
Corporate Expenses, Net									(377)	(469)	(454)
Corporate
Depreciation and amortization
Total									110	109	111
Expenditures for long-lived assets
Total									$ 98	$ 167	$ 48

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