Stockholders' Equity (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended									12 Months Ended		1 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Mar. 31, 2012		Sep. 30, 2013 Nadro [Member] Distribution Solutions [Member]	Mar. 31, 2013 Nadro [Member] Distribution Solutions [Member]	Sep. 30, 2012 Nadro [Member] Distribution Solutions [Member]	Mar. 31, 2013 Treasury Stock [Member]	Mar. 31, 2013 Retained Earnings [Member]	Jul. 31, 2013 Old Rate Per Share [Member]	Jul. 31, 2013 New Rate Per Share [Member]
Dividends Payable [Line Items]
Cash dividends declared per common share	$ 0.92		$ 0.80		$ 0.80							$ 0.20	$ 0.24
Treasury Stock, Shares, Retired			2
Retirement of treasury stock			$ 0							$ 217	$ (195)
Other Comprehensive (Income) Loss, Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Noncontrolling Interest	21
Interest in Investee							49.00%	49.00%	49.00%
Foreign Currency Translations Net losses Reclassed to Income	$ (44)	[1]	$ 0	[1]	$ 0	[1]

[1] As a result of our sale of our 49% equity interest in Nadro, foreign currency translation net losses of $44 million were reclassified from AOCI to other income, within our consolidated statement of operations. Such losses were previously considered in our impairment evaluation of the investment when we committed to a plan to sell the investment during the fourth quarter of 2013, and accordingly did not impact earnings for 2014.