Income Taxes (Components Of Deferred Tax Balances) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Income Tax Disclosure [Abstract]
Receivable allowances	$ 106	$ 84
Deferred revenue	136	106
Compensation and benefit related accruals	641	553
Loss and credit carryforwards	430	341
Other	289	281
Subtotal	1,602	1,365
Less: valuation allowance	(270)	(118)
Total assets	1,332	1,247
Inventory valuation and other assets	(2,163)	(2,089)
Fixed assets and systems development costs	(321)	(267)
Intangibles	(1,531)	(734)
Other	(118)	(24)
Total liabilities	(4,133)	(3,114)
Current net deferred tax asset	51	16
Current net deferred tax liability	(1,588)	(1,626)
Long-term deferred tax asset	19	21
Long-term deferred tax liability	(1,283)	(278)
Net deferred tax liability	$ (2,801)	$ (1,867)