Asset Impairments and Product Alignment Charges (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended			3 Months Ended		12 Months Ended	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2013 Technology Solutions [Member]	Sep. 30, 2010 Technology Solutions [Member]	Mar. 31, 2013 Technology Solutions [Member]	Mar. 31, 2012 Technology Solutions [Member] Product Alignment [Member]	Dec. 31, 2011 Technology Solutions [Member] Product Alignment [Member]	Mar. 31, 2012 Technology Solutions [Member] Product Alignment [Member]	Mar. 31, 2012 Technology Solutions [Member] Product Alignment [Member] Non Cash Asset Impairment Charges [Member]	Mar. 31, 2012 Technology Solutions [Member] Product Alignment [Member] Employee Severance [Member]	Mar. 31, 2012 Technology Solutions [Member] Product Alignment [Member] Customer Allowances [Member]	Mar. 31, 2012 Technology Solutions [Member] Product Alignment [Member] Other Product Alignment Charges [Member]	Mar. 31, 2012 Technology Solutions [Member] Product Alignment [Member] Cost of Sales [Member]	Mar. 31, 2012 Technology Solutions [Member] Product Alignment [Member] Operating Expense [Member]
Asset Impairments And Product Alignment Charges [Line Items]
Goodwill and Intangible Asset Impairment					$ 46		$ 46
Pre-tax charges resulting from product alignment plan								9	42	51	24	10	7	10	31	20
Asset impairment charge - capitalized software held for sale	10	10	0	72	10	72
Goodwill, Impairment Loss	$ 36	$ 36			$ 36		$ 36