Segments of Business (Segment Assets and Property, Plant and Equipment, Net by Geographica Ares) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Segment Reporting Information [Line Items]
Assets	$ 51,759	$ 34,786
Cash and cash equivalents	4,193	2,456	3,149	3,612
Total Property, Plant and Equipment, Net	2,222	1,321
United States
Segment Reporting Information [Line Items]
Total Property, Plant and Equipment, Net	1,246	1,205
Other [Member]
Segment Reporting Information [Line Items]
Total Property, Plant and Equipment, Net	976	116
Distribution Solutions [Member]
Segment Reporting Information [Line Items]
Assets	42,758	27,307
Technology Solutions [Member]
Segment Reporting Information [Line Items]
Assets	3,324	3,829
Operating Segments [Member]
Segment Reporting Information [Line Items]
Assets	46,082	31,136
Total Property, Plant and Equipment, Net	2,222	1,321
Corporate [Member]
Segment Reporting Information [Line Items]
Other	$ 1,484	$ 1,194